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1Z0-895 exam Dumps Source : Java Platform Enterprise Edition 6(R) Enterprise JavaBeans Developer Certified Expert(R)

Test Code : 1Z0-895
Test cognomen : Java Platform Enterprise Edition 6(R) Enterprise JavaBeans Developer Certified Expert(R)
Vendor cognomen : Oracle
real questions : 302 actual Questions

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Oracle Java Platform Enterprise Edition

Oracle Java regular edition Runtime atmosphere | killexams.com actual Questions and Pass4sure dumps

Oracle Java typical version Runtime environment (often known as JRE SE, Java SE or Java SE Runtime ambiance) is a closed-supply and freely allotted computer technology that offers an easy option to sprint Java courses on any Linux-based mostly operating device.

Invented with the aid of sun Microsystems

initially invented through sun Microsystems for interactive television, the application become up to now referred to as Java 2 Platform, universal version or J2SE. It became later obtained by using the Oracle agency that now actively develops and keeps the supply code.

it's known as Java SE (standard version) since the technology is additionally distributed as a Micro edition (ME) and an commerce edition (EE), which can be create simplest for embedded programs/cellular devices and commercial enterprise computing platforms respectively.

dispensed as binary applications for everysingle Linux distributions

The challenge enables users to possess fun with everysingle of the latest and choicest Java technologies from each the information superhighway and Java applications which are always distributed as JAR info. it's disbursed as binary archives that can besides be deployed on any 64-bit or 32-bit GNU/Linux distribution.

besides the universal binary information, Oracle additionally offers Linux clients with binary applications for everysingle RPM-based Linux distributions, including crimson Hat commercial enterprise Linux, Fedora, openSUSE and OpenMandriva.

Supported on a great number of working methods

The JRE (Java Runtime environment) and JDK (Java construction package) systems are platform-independent and suitable with many open supply and industrial working techniques, reminiscent of Linux, BSD, Solaris, Microsoft windows and Mac OS X, aiding the 64-bit, 32-bit and SPARC architectures.

whereas the Java Runtime environment platform is used most effective for having fun with flush web content and Java courses, the Java building outfit platform helps Java builders to create contemporaneous content for web sites or feature-rich applications that travail on multiple structures.

Java building kit incorporates Java Runtime ambiance

it is additionally essential to grasp that JDK (Java building equipment) includes the JRE (Java Runtime environment) platform, so you don’t ought to down load them one after the other if your leading purpose is to develop in Java.

Java Runtime atmosphere Java common edition Oracle Java Oracle Java JRE SE


Oracle: Java EE wants an Open supply basis | killexams.com actual Questions and Pass4sure dumps

information

Oracle: Java EE needs an Open supply foundation
  • by using John okay. Waters
  • 08/17/2017
  • With Java EE eight poised to head GA, and JavaOne 2017 just across the corner, Oracle Corp. says the time is birthright to "rethink" how Java EE is developed, and it's given that the learning advantages of relocating the platform and linked technologies to an open supply groundwork "to compose it greater agile and conscious of altering industry and technology demands."

    The Redwood Shores, Calif.-based steward of Java reclaim ahead that conception these days on The Aquarium weblog.

    "We harmonize with that stirring Java EE applied sciences to an open source foundation can be the birthright next step, so as to undertake more agile approaches, reclaim in oblige extra supple licensing, and alter the governance procedure," wrote Oracle software evangelist David Delabassee. "We device on exploring this chance with the group, their licensees and a number of candidate foundations to espy if they are able to flow Java EE forward during this course."

    The roster of technologies that tumble under the Java Platform commerce edition umbrella at present contains each open and proprietary tech. The TCKs (check compatibility kits), for instance, which might be used to validate and expose an implementation of the spec is compliant, are proprietary. And Java EE is licensed under an Oracle commerce license.

    Mike Lehman, VP of product administration at Oracle, additionally pointed to the notoriously byzantine Java Specification Participation settlement (JSPA), which former Chair of the Java community system (JCP) Patrick Curran once referred to as "big and scary," as a Part of the Java EE construction system that can be dramatically superior by this ilk of movement.

    "The manner itself within the JCP is idiosyncratic to the Java neighborhood and sphere to licensing rules and felony terms that are often now not viewed as permissive and simple as other foundations," Lehman stated in an email, "like Apache or Eclipse…"

    Lehman allowed that what Oracle is suggesting isn't as a whole lot about open sourcing Java EE because it is "opening up and updating the technique linked to Java EE to be compatible with the centered open supply basis method."

    in the Aquarium reclaim up, Delabassee emphasised that, whereas Oracle is exploring this thought, it intends "to fulfill its ongoing commitments to builders, cessation clients, valued clientele, know-how patrons, know-how contributors, partners, and licensees."

    "And they can assist current Java EE implementations and future implementations of Java EE eight," he wrote. "we will proceed to participate sooner or later evolution of Java EE technologies. but they reckon a more open technique, that isn't subject on a single seller as platform lead, will inspire greater participation and innovation, and may be in most desirable pursuits of the group."

    as a minimum one main seller believes Oracle is on the birthright song. "We mediate that putting Java EE below the jurisdiction of an open source company is a really high-quality stream to be able to odds the entire commerce Java neighborhood," famous John Clingan, senior principle product manager at pink Hat, in an e mail. "while there is lots of factor to flesh out, pink Hat is optimistic and applauds Oracle's choice to expand Java EE below an open and collaborative community."

    purple Hat is a member of the JCP and leads the CDI and Bean Validation Java EE-linked JSRs. The enterprise is a Java EE licensee, and its JBoss enterprise application Platform is wholly Java EE-suitable.

    yet another JCP member, Reza Rahman, a longtime commercial enterprise Java evangelist and founding member of the Java EE Guardians, besides favored the conception.

    "this is superb information," Rahman instructed ADTMag, "and a long time coming."

    Rahman and the Guardians began making the case that Oracle has been "conspicuously neglecting" Java EE due to the fact that the group became situated closing 12 months.

    "I suppose it remains actual that Oracle undervalues Java EE," he pointed out. "I achieve not believe the commerce is familiar with Java EE and what it may well achieve for it the way, for instance, Microsoft understands the value of .web. this is in reality a spacious victory for a lot of of us within the group. Now the ball is in their court, and the onus is upon us to compose the most of it."

    Oracle wants comments on this recommended novel direction for Java EE building, and the company is featuring a Place to weigh in by the consume of email: feedback@javaee.companies.io.

    about the writer

    John has been overlaying the high-tech beat from Silicon Valley and the San Francisco Bay enviornment for nearly two many years. He serves as Editor-at-tremendous for software progress developments (www.ADTMag.com) and contributes regularly to Redmond magazine, The know-how Horizons in schooling Journal, and Campus expertise. he's the writer of greater than a dozen books, together with The every runt thing e-book to sociable Media; The everything laptop book; Blobitecture: Waveform architecture and Digital Design; John Chambers and the Cisco method; and Diablo: The legitimate strategy book.


    Oracle Shares Key Updates on Java Platform, commerce version, Introduces GlassFish Server Open source version 4.1 at JavaOne 2014 | killexams.com actual Questions and Pass4sure dumps

    Oracle Shares Key Updates on Java Platform, enterprise edition, Introduces GlassFish Server Open source version 4.1 at JavaOne 2014

    source: Oracle enterprise

    Oracle Corporation

    September 29, 2014 11:10 ET

    Oracle particulars novel Capabilities in Upcoming Java EE 8 and Enhancements to GlassFish Server Open source edition

    SAN FRANCISCO, CA--(Marketwired - Sep 29, 2014) - JAVAONE, SAN FRANCISCO - Oracle (NYSE: ORCL)

    news abstract Ubiquitous throughout the know-how panorama, Java is the realm's most accepted programming language and serves as the backbone of countless creative applied sciences. because the international tolerable in community-driven commercial enterprise software, Java Platform, commerce edition (Java EE) is a a must-have platform for the progress and start of business-grade applications and features. To that end, Oracle and the Java neighborhood are perpetually innovating to oblige Java EE ahead and deliver value to end-users. At JavaOne 2014, Oracle highlighted key updates to the Java EE platform, including upcoming groundbreaking aspects in Java EE eight, and besides delivered the newest edition of GlassFish Server Open supply edition 4.1.

    news data

  • At JavaOne 2014, Oracle is showcasing the latest tendencies for Java Platform, enterprise edition (Java EE) and future plans for Java EE eight.
  • additionally, the enterprise is introducing GlassFish Server Open source edition four.1, which provides updated platform help, novel facets, and an superior developer experience.
  • Java EE 8, the next era of Java EE, has been accredited by the Java group system (JCP) govt Committee as Java Specification Request (JSR) 366 and is slated to be launched in 2016.
  • as the commerce typical for Java commerce computing, Java EE makes it workable for numerous implementations, which lowers possibility through offering organisations a conclusion of product implementation and carriers.
  • in addition, Java EE provides a actual groundwork that evolves to meet the wants of commerce applications.
  • Java EE eight will tender enhanced HTML5 aid to bring scalable services to cellular instruments and browsers, ease of progress for improved developer productiveness and less boilerplate code, and cloud enablement for transportable purposes in cloud environments.
  • Java EE 8 is defined inside the JCP, which ensures a clear discussion board that encourages collaboration amongst people, vendors, and organisations to create the Java EE eight specification.
  • additionally at JavaOne 2014, Oracle will showcase the tenacious momentum and persisted innovation in the back of Java Platform, ordinary version 8 (Java SE eight), which has seen record adoption.
  • Oracle is showcasing these and other Java enhancements everysingle through JavaOne 2014, operating September 28 through October 2, 2014 at the Hilton San Francisco Union rectangular and Parc fifty five Wyndham.
  • New Capabilities for the ordinary in community-pushed commerce software

  • Developed the usage of the Java neighborhood procedure with contributions from commerce specialists and commerce and open source companies, Java EE is the common in community-driven enterprise software. authorised JSRs anticipated to be featured in Java EE eight encompass:
  • Java API for JSON Binding 1.0 (JSR 367): Bidirectional mapping of Java objects and their JSON representations
  • Java Message service 2.1 (JSR 368): CDI alignment and superior ease of use
  • Java Servlet four.0 (JSR 369): HTTP 2.0 assist
  • Java API for RESTful web services 2.1 (JSR 370): Server-sent activities
  • model-View-Controller 1.0 (JSR 371): Standardized action-oriented MVC framework
  • JavaServer Faces 2.3 (JSR 372): greater AJAX API
  • extra JSRs are being planned, including:
  • Java EE security 1.0: Simplifies the progress of secure functions
  • leisure administration 1.0: RESTful administration and monitoring of Java EE software servers
  • JSON Processing 1.1: improved assist for Java SE 8 and enhancing/transforming JSON protest mannequin
  • Enhancements to GlassFish Server Open source edition

  • GlassFish Server Open supply edition four.1 presents a number of novel features including updated platform sheperd and an stronger developer event.
  • GlassFish Server Open supply version four.1 comprises:
  • up to date platform aid: the brand novel unlock features platform assist for Java eight, in addition to champion for WebSocket 1.1 and CDI 1.2 protection releases.
  • stronger trait and developer experience: the novel liberate contains up to date models of more than 20 subprojects and delivers greater than 1,000 trojan horse fixes and possess enhancements.
  • WebSocket Reference Implementation (Tyrus): This implementation adds session limits, proxy aid, customer reconnect, optimized broadcast, and performance metrics uncovered over Java administration Extension (JMX).
  • JAX-RS Reference Implementation (Jersey): This implementation adds a brand novel diagnostics API and Server-despatched undergo customer reconnect.
  • JMS over WebSocket (OpenMQ): GlassFish Server Open supply version four.1 adds sheperd for communicating over WebSocket, including the mqstmp and mqjsonstmp protocols for non-Java shoppers.
  • NetBeans 8.0.1 integration: GlassFish Server Open source edition 4.1 is now bundled in NetBeans eight.0.1, for a productive out-of-the-container Java EE 7 progress event.
  • The Java EE 7 utility progress kit (SDK) has been up to date to encompass GlassFish Server Open supply edition 4.1, in addition to an up-to-date Java EE tutorial and a novel zip installer.
  • Oracle is additionally offering an up to date Java EE Reference Implementation in response to GlassFish Server Open supply version 4.1.
  • assisting Quote

  • "Java Platform, enterprise version, the trade typical for commercial enterprise Java, continues to lead the commerce with an incredible volume of participation from consumer companies, businesses, trade specialists, and particular person developers," said Anil Gaur, vice president of software building, Oracle. "This participation manifests itself through GlassFish Server Open source edition 4.1 as an implementation of the newest Java EE 7 normal, and additionally with the active involvement of the impending Java EE eight platform during the undertake-a-JSR software."
  • aiding elements

    Java records and Figures

  • 9 million developers global
  • more than 3 billion contraptions are powered by Java expertise
  • more than a hundred twenty five million Java-primarily based media devices had been deployed
  • Over 10 billion Java playing cards had been shipped given that its introduction
  • About Oracle Oracle engineers hardware and software to travail together within the cloud and to your records middle. For extra counsel about Oracle (NYSE: ORCL), visit www.oracle.com.

    About JavaOne The JavaOne conference brings collectively Java experts and fanatics for an brilliant week of gaining learning of and networking focused wholly on everysingle things Java. With more than 550 periods overlaying themes that span the breadth of the Java universe, keynotes from most excellent Java visionaries, tutorials, and professional-led arms-on learning opportunities, JavaOne is the area's most captious event for the Java community. be a Part of the JavaOne discussion on Twitter, fb, LinkedIn, and the JavaOne weblog.

    trademarks Oracle and Java are registered trademarks of Oracle and/or its associates. other names may well be emblems of their respective homeowners.

    For a far better undergo using this web site, gratify help to a latest web browser.


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    Whatever Happened to JAAS? | killexams.com actual questions and Pass4sure dumps

    Introduced in 1995, Java has firmly established itself as a ripen mainstream programming language for enterprises. The Java platform security model has evolved over the years to meet novel requirements, and today enterprise Java developers possess a great number of APIs and services to pick from to fulfill their security needs.

    Originally touted as a secure runtime environment for downloadable executables (applets), Java platform security received a lot of attention early on and the rather obdurate security model was quickly identified as a weakness in the system. With the Java 2 Platform, Enterprise Edition (J2EE), Sun revamped the Java platform security model and introduced a fine-grained, flexible, and extensible security model for code-based security. This new model has largely been a success but it was restricted to code-based security. This makes sense for browser-based deployment environments but is not as germane for server-side deployments. To address this gap, Java Authentication and Authorization Service (JAAS) was introduced as an optional package for Java progress Kit (JDK) 1.3.1, and subsequently integrated into JDK 1.4.

    Sun officially announced Java Platform, Enterprise Edition (Java EE) 1.0 in 2000. Just as Java became the mainstream programming language of choice, Java EE has been widely adopted as the primary application platform for enterprises. But the security needs of enterprise applications are quite different from those of downloadable executable code, so Java EE defined its own security model that is declarative, consistent, and portable across Java EE implementations.

    JAAS was included officially as Part of the Java EE 1.3 specification. Unfortunately, Java EE 1.3 did not attempt to resolve the differences between the Java EE security model and JAAS, which made it more difficult to deploy off-the-shelf JAAS login modules in some vendors' implementations.

    State of Java EE SecurityIn this section, we'll provide a brief overview of the main players in the Java EE security landscape.

    Java EE Declarative SecurityJava EE defines a declarative and portable security model that applies to both Web and Enterprise JavaBeans (EJB) modules and applications. The main goal of the declarative security model is to decouple security concerns from commerce application logic, so enterprise application developers can focus on the main commerce functions and services provided by the applications without worrying aboutsecurity.

    The Java EE declarative security model applies to the servlet container and the EJB container. The servlet container security model is based on URL patterns, whereas the EJB security model is method-based.

    For security-aware applications, Java EE besides defines a programmatic API to ply more advanced security needs.

    JAASIntroduced as an option for JDK 1.3.1 and incorporated into J2EE 1.4, today JAAS has been quite widely adopted by commercial and open source vendors as the primary pluggable authentication framework for SE and EE applications alike.

    JAAS defines a framework for subject-based authentication and authorization in a pluggable manner, decoupling applications from underlying security implementations.

    Key components of JAAS include:

  • The definition of theme (javax.security.auth.Subject)
  • An authentication API (javax.security.auth.login.LoginContext) that supports pluggable and stacked authentications
  • An authentication SPI (javax.security.auth.spi.LoginModule) for pluggable authentication mechanisms
  • A configuration constrict for configuring and associating login modules with applications
  • A typesafe callback constrict (javax.security.auth.callback) for services to communicate with applications
  • The definition of SubjectDomainCombiner (javax.security.auth.SubjectDomainCombiner) for dynamically updating the protection domains with the principals from the subject, for integration with the J2EE security model
  • Figure 1 illustrates the JAAS authentication architecture.

    The JAAS authentication framework has been stable since JAAS 1.0 - there were some very minor changes (the introduction of a LoginContext constructor that takes a configuration as an dispute for dynamic configuration of login modules, for example), but in universal applications written on top of JAAS 1.0 (JDK 1.3.1) continue to travail without modification today (JDK 6.0). Perhaps more remarkable, login modules written to the JAAS 1.0 SPI can be plugged into today's applications, which reflects well on the overall design of the API.

    Figure 2 illustrates the typical authentication convoke sequence.

    Note that the application developer is largely decoupled from underlying login module implementations - especially if the login module implementation only uses the yardstick callbacks.

    When integrating JAAS authentication with Java EE implementations, however, a number of thorny issues arise.

  • Although JAAS uses theme to limn a user, Java EE uses principal. A theme can - and usually does - hold multiple (custom) principal instances, so there must be a mechanism whereby a container can determine the principal instance representing the caller or user.
  • The yardstick JAAS callbacks are useful and valuable for Java Platform, yardstick Edition applications, but they achieve not cover typical enterprise deployment scenarios. For instance, there is no yardstick definition of HttpServletRequestCallback or HttpServletResponseCallback, so if a login module provider needs to access the HttpServletRequest protest (say to retrieve a HTTP header value), thelogin module provider must apply to a vendor-specific API, compromising portability.
  • Java Specification Request 196When this was written, Java Specification Request (JSR) 196 was slated to be included as Part of Java EE 6.0.

    Figure 3 depicts the JSR 196 generic message processing model and the four interaction points.

    This generic model applies to any message-processing runtime that integrates with JSR 196. The reader is encouraged to peruse JSR 196 for more details.

    As Part of JSR 196, a servlet container profile is defined, clarifying how servlet container implementations can integrate with this contract. When this was written, this profile is under consideration as a Java EE 6.0 requirement.

    JSR 196 defines a yardstick SPI for authentication providers. Therefore, the interfaces introduced by JSR 196 are primarily used by Java EE container vendors. Consequently, Java EE application developers are not directly affected by a container vendor's uptake of this SPI.

    On the other hand, JSR 196 directly addresses a few long-standing problems in the JAAS/Java EE landscape, namely determining a yardstick passage to obtain user principals and group principals.

    JAAS, being a flexible, pluggable standard, allows any login module to define its own custom principal type(s) and populate the custom principal instance(s) into the subject. But because the custom principal type(s) are not known to the container, the container can only determine which principal represents the caller's identity by introducing CallerPrincipalCallback. JSR 196 addresses this issue. The ServerAuthModules can witness to the container which principal instance represents the caller, and you can ensure that getUserPrincipal and getRemoteUser return the revise and expected value instead of leaving it to the lenity of the vendor's implementation details.

    The requisite to obtain group principals is an equally fundamental issue. This is addressed by introduction of GroupPrincipalCallback in JSR 196.

    ConclusionJAAS has Come a long passage since it was an option for JDK 1.3.1. With the introduction of JSR 196 in Java EE 6.0, many of the thorny issues that exist today will finally be addressed. JAAS has certainly evolved, and it looks to be well positioned to possess a Place in the enterprise marketplace for years to come.

    •   •   •

    SOAP Box: The Talented Callback HandlerOne of the most all-around components introduced by JAAS is the typesafe callback constrict (javax.security.auth.callback). They assume the reader is already familiar with the commonly used NameCallback and PasswordCallback through which the security services (login modules) obtain user cognomen and password information. However, the callback constrict is actually a generic two-way communication model that can be applied in many circumstances, both security-related and not.

    For instance, JSR 196 takes odds of the callback constrict by defining a CallerPrincipalCallback whereby a security service (such as ServerAuthModule) can communicate with the container (or application) that the principal instance represents, solving a long-standing issue. JSR 115 defines a similar callback constrict (javax.security.jacc.PolicyContextHandler) that enables the container to communicate additional contextual information to the policy provider to champion advanced security policies such as the instance-based security model. In fact, with the callback model, notions such as XACML-styled obligations can be supported as well, without affecting existing APIs.

    Finally, JSR 196 creates a bridge to JAAS login modules, helping to preserve existing investments in JAAS. It besides properly decouples JAAS login modules from any protocol-specific processing. In the past, attempts to create a JAAS login module to integrate with a single sign-on solution failed because there was no portable passage to access the HttpRequest/Response objects. JSR196 solves that issue - not by making HttpRequest/Response objects available to JAAS login modules, but by cleanly separating the component that deals with protocol-specific processing from the component that deals with credential validation (the JAAS login module). They believe this is the birthright approach.

    When this was written, Glassfish was the only major Java EE provider that supports JSR 196, but the servlet container profile was slated to be Part of Java EE 6.0, so you can await major Java EE vendors to champion this constrict as well.

    •   •   •

    SOAP Box: Why JSR 196?The benefits of JSR 196 include:

  • It is sufficiently flush to enable implementations of involved authentication protocols
  • It is portable across component containers and servers-WORA capabilities for server-side authentication modules-Application-level binding supports application-level authentication configurations and mechanisms-Security-aware enterprise applications can remain portable
  • It properly delegates security processing to ServerAuthModules, which are registered/configured at the container flat and can be associated with applications
  • It supports and preserves the existing declarative Java EE security model, auth-constraint processing, and the like
  • It defines a servlet container profile and a SOAP profile (with Java Message Service, Internet Inter-ORB Protocol, and the like) to be defined in the future
  • By supporting JSR196, Java EE vendors benefit by leveraging the available ServerAuthModule implementations for competitive advantages.

    How about Servlet Filters? Servlet filter is a very useful mechanism, but servlet filters must be configured as Part of the application (via web.xml) and are considered Part of the application. In fact, by the time a servlet filter is invoked, the authentication has already happened and auth-constraints possess already been processed. That does not express they cannot consume servlet filters for security needs, but there are some undesirable tradeoffs with this approach.

    How about Spring Security? Spring is perhaps the most vital de facto application framework in consume today, and Spring security (formerly ACEGI security) is the main security framework provided by Spring. It takes odds of Spring-styled configuration, aspect-oriented programming, and inversion of control technologies. Not surprisingly, Spring security uses a filter-based approach. Users must configure a sequence of filters as Part of the application, and then Spring security effectively replaces Java EE container security. To compensate, Spring security provides its own security model based on URL patterns, and provides features typically create in servlet container implementations. The features offered by Spring security are indeed valuable and should not be underestimated - and aside from servlet filters, there are few other options available today. However, there are inevitably tradeoffs involved when this method is employed, and users should be aware of them. In fact, when JSR 196 becomes readily available, they await some of the features implemented via servlet filters be folded into ServerAuthModule implementations.


    Simple Web Profile Application Server | killexams.com actual questions and Pass4sure dumps

    The Java EE 6 Web Profile specification defines the Java EE Web Profile (“Web Profile”), a profile of the Java Platform, Enterprise Edition specifically targeted at web applications. Siwpas, (Simple Web Profile Application Server) is an application server aimed at implementing the Java EE Web Profile specification. In this article, the components of Siwpas, its current situation and the flat of compatibility regarding the Web Profile Specification will be discussed.

    Java Enterprise Edition (Java EE or formerly known as Java 2 Platform, Enterprise Edition or J2EE) is an enterprise platform for developing highly available, secure, dependable and scalable commerce applications. The Java EE platform has undergone several changes from its first release version J2EE 1.2 (December 12, 1999). The latest version of the specification is Java Platform, Enterprise Edition (Java EE) Specification, v6. In this white paper, Java EE and Java Platform, Enterprise Edition (Java EE) Specification, v6 will be used interchangebly. The Java EE Specification defines “Java EE Profiles”. A Java EE profile (simply “a profile”) represents a configuration of the platform suited to a particular class of applications.

    “Java EE Web Profile” is a “Java EE Profile” that consists of several independent specifications related to web application development. Siwpas is an open source (LGPL license) application server based on Apache Software Foundation (ASF) Java EE projects. The latest version of Siwpas is “CR-5” and the first commerical trait version is planned to be released at the cessation of March. This white paper has been organized as follows: Java EE Web Profile section gives some details about Web Profile. The next section talks about the ASF and its Java EE based projects. The MechSoft Siwpas section explains the components of Siwpas and its compatibility regarding the Web Profile specification. This white paper ends with Summary and References sections.

    Java EE 6 Web Profile

    The Java EE Platform Specification consists of a huge number of specifications (APIs). For platform provider companies, it is not easy to develop a fully compliant Java EE Platform that implements everysingle of the required components of the Java EE Platform Specification. For application developers, it is not necessary to consume everysingle of the Java EE APIs for developing enterprise applications. Because of these observations, the Java EE Expert Group (EG) has defined Profiles in Java EE v6 and the first yardstick profile has been defined, “Java Platform, Enterprise Edition 6 (Java EE 6) Web Profile Specification”.

    The Web Profile is aimed at developers of modern web applications. Aiming “modern” web applications then implies offering a reasonably complete stack, composed of yardstick APIs, and out-of-the-box capability to address the needs of a great class of web applications. Furthermore, this stack should be easy to grow, so as to address any remaining developer needs. The Web Profile stack has consisted of several technologies. Table 1 shows the Web Profile required components. Java web applications are generally written as 3-tiers. These tiers are “Web Tier”, “Business Tier ” and “Persistence Tier”. Each of the Web Profile component sits on these tiers as follows:

    • Web Tier: Servlet, Java Server Pages, Debugging champion for Other Languages, yardstick Tag Library for JSP, Java Server Faces.

    • commerce Tier: Enterprise Java Beans Lite, Persistence Tier, Java Persistence API

    Some of the components are used for universal functionality. These components and their functions are as follows:

    • Common Annotations for the Java Platform: This JSR will develop annotations for common semantic concepts in the J2SE and J2EE platforms that apply across a variety of individual technologies:

    • Java Transaction API: Transaction management and demarcation

    • Bean Validation: Management of commerce constraints

    • Managed Beans: Common lifecycle of managed beans

    • Interceptors: Aspect Oriented Programming (AOP) operations

    • Context and Dependency Injection for Java EE: Dependency injection for Java EE

    • Dependency Injection for Java: Dependency injection for yardstick Java

    As they know, the Java EE Web Profile is a subset of the Java EE Platform specification. Lots of Java EE Platform specification required components are not contained in the Java EE Web Profile. For exampe, these are components that not defined for the Java EE Web Profile specification: JAX-WS, JAX-RPC, JAX-R, SAAJ, JAX-RS, JAX-B, JMS, JAAS, JASPIC, JACC, JCA, JavaMail, JSR77, JSR88. Finally, it is worth remembering that Web Profile products are allowed to ship with additional technologies, to the required ones. It is conceivable that products will tender choices during installation between different configurations, some richer in extensions, or even allow for complete customization beyond the required core (“à la carte” installation).

    Apache EE Projects

    The Apache Software Foundation provides organizational, legal, and financial champion for a broad reach of open source software projects. The Foundation provides an established framework for intellectual property and financial contributions that simultaneously limits the contributors’ potential legal exposure. Through a collaborative and meritocratic progress process, Apache projects deliver enterprise-grade, freely available software products that attract great communities of users. The pragmatic Apache License makes it easy for everysingle users, commercial and individual, to deploy Apache products.

    In Siwpas, they consume ASF Java EE projects for satisfying Java EE Web Profile required components. These projects and their correspondence to Web Profile components are shown below.

    With the exception of the Apache OpenEJB project, each of the above ASF projects is standalone compatible with TCK (Technology Compatibility Kit). In other words, Tomcat 7, MyFaces 2, OpenWebBeans, Bean Validation and OpenJPA are TCK compliant projects on their own.

    EJB Lite container in Siwpas is a subset of the Apache OpenEJB project and is called a Siwpas EJB Lite Container. Currently Siwpas EJB Lite Container has not been tested with EJB 3 Lite TCK.

    Mechsoft Siwpas Application Server

    Siwpas (pronounced as Simple Web Profile Application Server) is a lightweight Java application server platform for developing enterprise trait Java EE web applications. Siwpas integrates above ASF Java EE based projects for providing a Java EE Web Profile compatible runtime platform Integrating different sets of projects on the selfsame runtime is not an easy job . MechSoft has been writing an integration layer component to integrate Apache Tomcat 7 runtime with Siwpas EJB 3.1. Lite container runtime.

    Moreover, a cold web based management console for managing everysingle aspects of Siwpas has been written. The Siwpas management console will be released with the 1.0.0 GA release of Siwpas and provides the following management operations:

    • Overall realtime view of the current running system: CPU, Memory, OS, JVM stack size

    • Server configuration

    • Applications view and deployment operations

    • JMX, JNDI and ClassLoader views

    • Dashboards

    • Web and EJB Container runtime status

    • And more…

    Figure 2 shows a sample snapshot view from Siwpas console “Applications View” page.

    Why Siwpas, why another server?

    Before Siwpas was developed, Apache OpenWebBeans (implementation of Context and Dependency Injection for Java EE Specification) and Apache OpenEJB were used in some commercial projects, but they wanted to consume a lightweight application server in a cloud infrastructure. At that time there was no open source application server for using the OpenWebBeans and the OpenEJB in a lightweight server runtime. Therefore it was decided to implement a lightweight server based on Apache Tomcat 7.

    Nowadays, a huge number of application developers and enterprise companies want to consume lightweight application servers for deploying and running their web applications. They achieve not want to consume heavyweight Java EE Servers that are fully compliant with Java EE Specifications. They want to manage lightweight, cloud environment friendly servers. Nonetheless, they besides requisite more technology stack for implementing their web based applications, such as “JPA, JSF, JTA , EJB etc.” Moreover, most of them deploy their captious enterprise web applications into the Apache Tomcat in their production systems.

    Siwpas is aimed at providing a lightweight application server runtime based on Apache Tomcat 7 . It besides fills web applications technology requirements via ASF Java EE projects. In summary, Siwpas translates Apache Tomcat 7 into a more powerful enterprise web server.

    The benefits of using Siwpas can be listed as follows:

    • It has a lightweight but powerful runtime environment

    • It is based on the very-well known JSP & Servlet Container, Apache Tomcat 7

    • It consists of Web Profile Specification technology stack

    • It consists of powerful, commerical trait ASF Java EE Projects

    • It is an open source project

    • It is supported by MechSoft (7×24 enterprise support)

    • It is light and will be always light

    • It has a very cold JSF based administration console

    Web Profile Compliance

    Currently Siwpas does not title compliance with Java EE Web Profile Specification because it has not been tested with Java EE Web Profile TCK. This does not express that Siwpas will never be certified as a Web Profile Compliance application server. In order to test Siwpas with Java EE Web Profile TCK, MechSoft has to be a licensee of Oracle and they are discussing a reasonable passage to obtain this TCK. As mentioned in the above paragraphs, with the exception of Apache OpenEJB, ASF Java EE projects are TCK compliant with their respective specificiations.

    Siwpas Editions

    There are two different editions of Siwpas: Community Edition and Enterprise Edition. The table below shows differences between each edition.

    Summary

    The Java EE Web Profile Specification is the first yardstick profile specification in the Java EE Profiles that is explained in the Java EE Platform Specification. Instead of using plenary profile compatible Java EE servers, developers are now able to consume more lightweight server runtimes for developing their Java based web applications. This does not express that plenary profile application servers such as Apache Geronimo will be useless. Some enterprise applications still requisite to consume other cold features of the Java EE plenary profile, such as Remote EJB Invocation, Asynchronous Message Processing via JMS, CORBA Integration etc. In an upcoming version of the Java EE platform, a number of more specific profiles can be seen. Siwpas is a lightweight web application server based on the ASF Java EE projects. It provides Java EE Web Profile components with a powerful web based administration console. It is one of the lightweight application servers to implement Java EE Web Profile Specification.


    An Overview of Batch Processing in Java EE 7.0 | killexams.com actual questions and Pass4sure dumps

    This post by Mahesh Kannan appears via Oracle.

    Batch processing is used in many industries for tasks ranging from payroll processing; statement generation; end-of-day jobs such as interest calculation and ETL (extract, load, and transform) in a data warehouse; and many more. Typically, batch processing is bulk-oriented, non-interactive, and long running—and might be data- or computation-intensive. Batch jobs can be sprint on schedule or initiated on demand. Also, since batch jobs are typically long-running jobs, check-pointing and restarting are common features create in batch jobs.

    JSR 352 (Batch Processing for Java Platform), Part of the recently introduced Java EE 7 platform, defines the programming model for batch applications plus a runtime to sprint and manage batch jobs. This article covers some of the key concepts including feature highlights, an overview of selected APIs, the structure of Job Scheduling Language, and a sample batch application. The article besides describes how you can sprint batch applications using GlassFish Server Open Source Edition 4.0.

    Batch Processing Architecture

    This section and pattern 1 limn the basic components of the batch processing architecture.

    Figure 1

    Figure 1

  • A job encapsulates the entire batch process. A job contains one or more steps. A job is reclaim together using a Job Specification Language (JSL) that specifies the sequence in which the steps must be executed. In JSR 352, JSL is specified in an XML file called the job XML file. In short, a job (with JSR 352) is basically a container for steps.
  • A step is a domain protest that encapsulates an independent, sequential facet of the job. A step contains everysingle the necessary logic and data to effect the actual processing. The batch specification deliberately leaves the definition of a step vague because the content of a step is purely application-specific and can be as involved or simple as the developer desires. There are two kinds of steps: chunk and batchlet.
  • A chunk-style step contains exactly one ItemReader, one ItemProcessor, and one ItemWriter. In this pattern, ItemReaderreads one detail at a time, ItemProcessor processes the detail based upon the commerce logic (such as "calculate account balance"), and hands it to the batch runtime for aggregation. Once the "chunk-size" number of items are read and processed, they are given to an ItemWriter, which writes the data (for example, to a database table or a flat file). The transaction is then committed.
  • JSR 352 besides defines a roll-your-own kindhearted of a step called a batchlet. A batchlet is free to consume anything to accomplish the step, such as sending an e-mail.
  • JobOperator provides an interface to manage everysingle aspects of job processing, including operational commands, such as start, restart, and stop, as well as job repository commands, such as retrieval of job and step executions. espy section 10.4 of the JSR 352 specification for more details about JobOperator.
  • JobRepository holds information about jobs currently running and jobs that ran in the past. JobOperator provides APIs to access this repository. A JobRepository could be implemented using, say, a database or a file system.
  • Developing a Simple Payroll Processing Application

    This article demonstrates some of the key features of JSR 352 using a simple payroll processing application. The application has been intentionally kept quite simple in order to focus on the key concepts of JSR 352.

    The SimplePayrollJob batch job involves reading input data for payroll processing from a comma-separated values (CSV) file. Each line in the file contains an employee ID and the ground salary (per month) for one employee. The batch job then calculates the tax to be withheld, the bonus, and the net salary. The job finally needs to write out the processed payroll records into a database table.

    We consume a CSV file in this specimen just to demonstrate that JSR 352 allows batch applications to read and write from any arbitrary source.

    Job Specification Language for the Payroll Processing Application

    We discussed that a step is a domain protest that encapsulates an independent, sequential facet of the job, and a job is basically a container for one or more steps.

    In JSR 352, a JSL basically specifies the order in which steps must be executed to accomplish the job. The JSL is powerful enough to allow conditional execution of steps, and it besides allows each step to possess its own properties, listeners, and so on.

    A batch application can possess as many JSLs as it wants, thus allowing it to start as many batch jobs as required. For example, an application can possess two JSLs, one for payroll processing and another for report generation. Each JSL must be named uniquely and must be placed in the META-INF/batch-jobs directory. Subdirectories under META-INF/batch-jobs are ignored.

    Our JSL for payroll processing is placed in a file called SimplePayrollJob.xml and looks relish Listing 1:

    <job id="SimplePayrollJob" xmlns=http://xmlns.jcp.org/xml/ns/javaee version="1.0"> <step id="process"> <chunk item-count="2"> <reader ref="simpleItemReader/> <processor ref="simpleItemProcessor/> <writer ref="simpleItemWriter/> </chunk> </step> </job>

    Listing 1

    Our SimplePayrollJob batch job has just one step (called "process"). It is a chunk-style step and has (as required for a chunk-style step), an ItemReader, an ItemProcessor, and an ItemWriter. The implementations for ItemReader, ItemProcessor, andItemWriter for this step are specified using the ref attribute in the <reader>, <processor>, and <writer> elements.

    When the job is submitted (we will espy later how to submit batch jobs), the batch runtime starts with the first step in the JSL and walks its passage through until the entire job is completed or one of the steps fails. The JSL is powerful enough to allow both conditional steps and parallel execution of steps, but they will not cover those details in this article.

    The item-count attribute, which is defined as 2 in Listing 1, defines the chunk size of the chunk.

    Here is a high-level overview of how chunk-style steps are executed. gratify espy section 11.6 ("Regular Chunk Processing") of the JSR 352 specification for more details.

  • Start a transaction.
  • Invoke the ItemReader and pass the detail read by the ItemReader to the ItemProcessor. ItemProcessor processes the detail and returns the processed detail to the batch runtime.
  • The batch runtime repeats Step 2 item-count times and maintains a list of processed items.
  • The batch runtime invokes the ItemWriter that writes item-count number of processed items.
  • If exceptions are thrown from ItemReader, ItemProcessor, or ItemWriter, the transaction fails and the step is marked as "FAILED." gratify refer to Section 5.2.1.2.1 ("Skipping Exceptions") in the JSR 352 specification.
  • If there are no exceptions, the batch runtime obtains checkpoint data from ItemReader and ItemWriter (see section 2.5 in the JSR 352 specification for more details). The batch runtime commits the transaction.
  • Steps 1 through 6 are repeated if the ItemReader has more data to read.
  • This means that in their example, the batch runtime will read and process two records and the ItemWriter will write out two records per transaction.

    Writing the ItemReader, ItemProcessor, and ItemWriter Writing the ItemReader

    Our payroll processing batch JSL defines a single chunk style step and specifies that the step uses an ItemReader namedsimpleItemReader. Their application contains an implementation of ItemReader to read input CSV data. Listing 2 shows a snippet of our ItemReader:

    @Named public class SimpleItemReader extends AbstractItemReader { @Inject private JobContext jobContext; ... }

    Listing 2

    Note that the class is annotated with the @Named annotation. Because the @Named annotation uses the default value, the Contexts and Dependency Injection (CDI) cognomen for this bean is simpleItemReader. The JSL specifies the CDI cognomen of the ItemReader in the<reader> element. This allows the batch runtime to instantiate (through CDI) our ItemReader when the step is executed.

    Our ItemReader also injects a JobContext. JobContext allows the batch artifact (ItemReader, in this case) to read values that were passed during job submission.

    Our payroll SimpleItemReader overrides the open() method to open the input from which payroll input data is read. As they shall espy later, the parameter prevCheckpointInfo will not be null if the job is being restarted.

    In their example, the open() method, which is shown in Listing 3, opens the payroll input file (which has been packaged along with the application).

    public void open(Serializable prevCheckpointInfo) throws Exception { JobOperator jobOperator = BatchRuntime.getJobOperator(); Properties jobParameters = jobOperator.getParameters(jobContext.getExecutionId()); String resourceName = (String) jobParameters.get("payrollInputDataFileName"); inputStream = novel FileInputStream(resourceName); br = novel BufferedReader(new InputStreamReader(inputStream)); if (prevCheckpointInfo != null) recordNumber = (Integer) prevCheckpointInfo; for (int i=1; i<recordNumber; i++) { //Skip upto recordNumber br.readLine(); } System.out.println("[SimpleItemReader] Opened Payroll file for reading from record number: " + recordNumber); }

    Listing 3

    The readItem() method basically reads one line of data from the input file and determines whether the line contains two integers (one for employee ID and one for ground salary). If there are two integers, it creates and returns a novel instance of PayrollInputRecord and returns to the batch runtime (which is then passed to ItemWriter).

    public protest readItem() throws Exception { protest record = null; if (line != null) { String[] fields = line.split("[, \t\r\n]+"); PayrollInputRecord payrollInputRecord = novel PayrollInputRecord(); payrollInputRecord.setId(Integer.parseInt(fields[0])); payrollInputRecord.setBaseSalary(Integer.parseInt(fields[1])); record = payrollInputRecord; //Now that they could successfully read, Increment the record number recordNumber++; } return record; }

    Listing 4

    The method checkpointInfo() is called by the batch runtime at the cessation of every successful chunk transaction. This allows the Reader to check point the last successful read position.

    In their example, the checkpointInfo() returns the recordNumber indicating the number of records that possess been read successfully, as shown in Listing 5.

    @Override public Serializable checkpointInfo() throws Exception { return recordNumber; }

    Listing 5

    Writing the ItemProcessor

    Our SimpleItemProcessor follows a pattern similar to the pattern for SimpleItemReader.

    The processItem() method receives (from the batch runtime) the PayrollInputRecord. It then calculates the tax and net and returns a PayrollRecord as output. Notice in Listing 6 that the ilk of protest returned by an ItemProcessor can be very different from the ilk of protest it received from ItemReader.

    @Named public class SimpleItemProcessor implements ItemProcessor { @Inject private JobContext jobContext; public protest processItem(Object obj) throws Exception { PayrollInputRecord inputRecord = (PayrollInputRecord) obj; PayrollRecord payrollRecord = novel PayrollRecord(); int ground = inputRecord.getBaseSalary(); float tax = ground * 27 / 100.0f; float bonus = ground * 15 / 100.0f; payrollRecord.setEmpID(inputRecord.getId()); payrollRecord.setBase(base); payrollRecord.setTax(tax); payrollRecord.setBonus(bonus); payrollRecord.setNet(base + bonus - tax); return payrollRecord; } }

    Listing 6

    Writing the ItemWriter

    By now, SimpleItemWriter must be following predictable lines for you.

    The only divergence is that it injects an EntityManager so that it can persist the PayrollRecord instances (which are JPA entities) into a database, as shown in Listing 7.

    @Named public class SimpleItemWriter extends AbstractItemWriter { @PersistenceContext EntityManager em; public void writeItems(List list) throws Exception { for (Object obj : list) { System.out.println("PayrollRecord: " + obj); em.persist(obj); } } }

    Listing 7

    The writeItems() method persists everysingle the PayrollRecord instances into a database table using JPA. There will be at most item-count entries (the chunk size) in the list.

    Now that they possess their JSL, ItemReader, ItemProcessor, and ItemWriter ready, let's espy how a batch job can be submitted.

    Starting a Batch Job from a Servlet

    Note that the mere presence of a job XML file or other batch artifacts (such as ItemReader) doesn't express that a batch job is automatically started when the application is deployed. A batch job must be initiated explicitly, say, from a servlet or from an Enterprise JavaBeans (EJB) timer or an EJB commerce method.

    In their payroll application, they consume a servlet (named PayrollJobSubmitterServlet) to submit a batch job. The servlet displays an HTML page that presents to the user a form containing two buttons. When the first button, labeled Calculate Payroll, is clicked, the servlet invokes the startNewBatchJob method, shown in Listing 8, which starts a novel batch job.

    private long startNewBatchJob() throws Exception { JobOperator jobOperator = BatchRuntime.getJobOperator(); Properties props = novel Properties(); props.setProperty("payrollInputDataFileName", payrollInputDataFileName); return jobOperator.start(JOB_NAME, props); }

    Listing 8

    The first step is to obtain an instance of JobOperator. This can be done by calling the following:

    JobOperator jobOperator = BatchRuntime.getJobOperator();

    The servlet then creates a Properties object and stores the input file cognomen in it. Finally, a novel batch job is started by calling the following:

    jobOperator.start(jobName, properties)

    The jobname is nothing but the job JSL XML file cognomen (minus the .xml extension). The properties parameter serves to pass any input data to the job. The Properties object (containing the cognomen of the payroll input file) is made available to other batch artifacts (such as ItemReader, ItemProcessor, and so on) through the JobContext interface.

    The batch runtime assigns a unique ID, called the execution ID, to identify each execution of a job whether it is a freshly submitted job or a restarted job. Many of the JobOperator methods snare the execution ID as parameter. Using the execution ID, a program can obtain the current (and past) execution status and other statistics about the job. The JobOperator.start() method returns the execution ID of the job that was started.

    Retrieving Details About Batch Jobs

    When a batch job is submitted, the batch runtime creates an instance of JobExecution to track it. JobExecution has methods to obtain various details such as the job start time, job completion time, job exit status, and so on. To obtain the JobExecution for an execution ID, you can consume the JobOperator.getJobExecution(executionId) method. Listing 9 shows the definition of JobExecution:

    package javax.batch.runtime; public interface JobExecution { long getExecutionId(); java.lang.String getJobName(); javax.batch.runtime.BatchStatus getBatchStatus(); java.util.Date getStartTime(); java.util.Date getEndTime(); java.lang.String getExitStatus(); java.util.Date getCreateTime(); java.util.Date getLastUpdatedTime(); java.util.Properties getJobParameters(); }

    Listing 9

    Packaging the Application

    Now that they possess their JSL, ItemReader, ItemProcessor, ItemWriter, and their servlet ready, it is time to package them and comeby ready to deploy.

    You can deploy your batch application as any of the supported Java EE archives (for example, .war, .jar, or .ear). You can bundle your batch artifact classes along with other Java EE classes (such EJB beans and servlets).

    The only special requirement is that you requisite to Place your job JSLs under the META-INF/batch-jobs directory for .jar files. For.war archive types, Place your job JSLs under the WEB-INF/classes/META-INF/batch-jobs directory.

    Deploying and Running the Payroll Sample Application in GlassFish 4.0

    Let's deploy the payroll application that they possess developed into the GlassFish 4.0 application server. GlassFish 4.0 is the reference implementation (RI) for the Java EE 7.0 specification and contains the RI for JSR 352 as well. You can find more information about GlassFish 4.0 at http://glassfish.org and about the Java Batch 1.0 RI at https://java.net/projects/jbatch/.

    Installing and Starting GlassFish 4.0

    You can download GlassFish 4.0 from https://glassfish.java.net/public/downloadsindex.html#top and then install it. Start GlassFish 4.0 by opening a command window and running the following command:

    <GlassFish Install Dir>/bin/asadmin start-domain

    Because the sample payroll application uses a database (to write out processed data), they requisite a database running before they can sprint their application. You can start the Apache Derby database by running the following command:

    <GlassFish Install Dir>/bin/asadmin start-database Compiling, Packaging, and Deploying the Payroll Application

    First, create a novel directory named hello-batch. Then change to the hello-batch directory:

    cd hello-batch

    To compile and package, sprint the following command, which creates hello-batch.war under the target directory:

    mvn antiseptic package

    To deploy hello-batch.war, sprint the following command:

    <GlassFish Install Dir>/bin/asadmin deploy target/hello-batch.war

    If you want to redeploy the application, you can sprint the following command:

    <GlassFish Install Dir>/bin/asadmin deploy -force target/hello-batch.war Running the Payroll Application

    Once you deploy the hello-batch.war file, you can sprint the application by accessing http://localhost:8080/hello-batch/PayrollJobSubmitterServlet from a browser. Accessing this URL should present the screen shown in pattern 2.

    Figure 2

    Figure 2

    Click the Calculate Payroll button and you should espy a novel entry in the table, as shown in pattern 3.

    Figure 3

    Figure 3

    Click the Refresh button and you should espy the Exit Status and cessation Time columns updated for the latest job (see pattern 4). The Exit Status column shows whether the job failed or completed successfully. Since our SimplePayrollJob doesn't possess any errors (at least not yet!), the Exit Status displays COMPLETED.

    Figure 4

    Figure 4

    Click the Calculate Payroll and Refresh buttons a few more times. Note that each time a job is started, a novel execution ID (and instance ID) is given to the job, as shown in pattern 5.

    Figure 5

    Figure 5

    Restarting Failed Jobs

    So far, they had been starting batch jobs using the jobOperator.start() method. Let's aver that their payroll input file has some errors. Either the ItemReader or the ItemProcessor could detect invalid records and fail the current step and the job. The administrator or the cessation user can fix the oversight and can restart the batch job. This approach of launching a novel job that starts from the nascence after recovering from errors might not scale if the amount of data to be processed is large. JobOperator provides another method calledrestart() to solve exactly this problem.

    Quick Overview of JobInstance and JobExecution

    We saw earlier that a job is essentially a container for steps. When a job is started, it must be tracked, so the batch runtime creates aJobInstance. A JobInstance refers to the concept of a rational run. In their example, they possess a PayrollJob and if the PayrollJob is sprint every month, there will be a Jan-2013 JobInstance and there will be another Feb-2013 JobInstance, and so on.

    If the payroll processing for Jan-2013 fails, it must be restarted (after presumably fixing the error), but it is still the Jan-2013 sprint because it is still processing Jan-2013 records.

    A JobExecution refers to the concept of a single attempt to sprint a Job. Each time a job is started or restarted, a new JobExecution is created that belongs to the same JobInstance. In their example, if the Jan-2013 JobInstance is restarted, it is still the selfsame Jan-2013JobInstance but a new JobExecution is created that belongs to the same JobInstance.

    In summary, a job can possess one or more instances of JobInstance and each JobInstance can possess one or more JobExecutioninstances. Using a new JobInstance means "start from the beginning" and using an existing JobInstance generally means "start from where you left off."

    Resuming Failed Jobs

    If you recall, a chunk-style step executes in a transaction in which item-count entries are read, processed, and written. After theItemWriter's writeItems() has been invoked, the batch runtime calls the checkpointInfo() method on both ItemReader andItemWriter. This allows both ItemReader and ItemWriter to bookmark (save) their current progress. The data that is bookmarked for an ItemReader could be anything that will champion it to resume reading. For example, our SimpleItemReader needs to reclaim the line number up to which it has read successfully so far.

    Section 10.8 of the JSR 352 specification describes the restart processing in detail.

    Let's snare a instant to peer into the log file where our SimpleItemReader outputs some useful messages from the open() andcheckpoint() methods. Each message is prefixed with the string [SimpleItemReader] so you can quickly identify the messages. The log file is located at <GlassFish install Dir>/domains/domain1/logs/server.log.

    Listing 10 shows the messages that are prefixed by the string [SimpleItemReader]:

    [SimpleItemReader] Opened Payroll File. Will start reading from record number: 0]] [SimpleItemReader] checkpointInfo() called. Returning current recordNumber: 2]] [SimpleItemReader] checkpointInfo() called. Returning current recordNumber: 4]] [SimpleItemReader] checkpointInfo() called. Returning current recordNumber: 6]] [SimpleItemReader] checkpointInfo() called. Returning current recordNumber: 8]] [SimpleItemReader] checkpointInfo() called. Returning current recordNumber: 9]] [SimpleItemReader] immediate called.]]

    Listing 10

    Note: You could besides consume the command tail -f server.log | grep SimpleItemReader.

    Because, their job XML file (SimplePayrollJob.xml) specifies a value of 2 for item-count as the chunk size, the batch runtime callscheckpointInfo() on our ItemReader every two records. The batch runtime stores this checkpoint information in JobRepository. So, if an oversight occurs during the midst of their chunk processing, the batch application must be able to resume from the last successful checkpoint.

    Let's insert some errors in their input data file and espy how they can retrieve from input errors.

    If you peer at their servlet's output, which is located under <GlassFish install Dir>/domains/domain1/applications/hello-batch/WEB-INF/classes/payroll-data/payroll-data.csv, you espy that it displays the location of the input file from where CSV data is read for their payroll application. Listing 11 shows the content of the file:

    1, 8100 2, 8200 3, 8300 4, 8400 5, 8500 6, 8600 7, 8700 8, 8800 9, 8900

    Listing 11

    Open your favorite editor and insert an error. For example, let's aver they add a few characters to the salary sphere on the eighth record, as shown in Listing 12:

    1, 8100 2, 8200 3, 8300 4, 8400 5, 8500 6, 8600 7, 8700 8, abc8800 9, 8900

    Listing 12

    Save the file and quit the editor. evanesce back to your browser and click the Calculate Payroll button followed by the Refresh button. You would espy that the recently submitted job failed, as shown in pattern 6. (Look at the Exit Status column.)

    Figure 6

    Figure 6

    You will besides notice that a Restart button appears next to the execution ID of the job that just failed. If you click Refresh, the job will fail (because they haven't fixed the issue yet). pattern 7 shows what is displayed after a few clicks of the Refresh button.

    Figure 7

    Figure 7

    If you peer into the GlassFish server log (located under <GlassFish install Dir>/domains/domain1/logs/server.log), you will espy an exception, as shown in Listing 13:

    Caught exception executing step: com.ibm.jbatch.container.exception.BatchContainerRuntimeException: Failure in Read-Process-Write Loop ... ... Caused by: java.lang.NumberFormatException: For input string: "abc8800" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.lang.Integer.parseInt(Integer.java:492) at java.lang.Integer.parseInt(Integer.java:527) at com.oracle.javaee7.samples.batch.hello.SimpleItemReader.readItem(SimpleItemReader.java:100)

    Listing 13

    You should besides notice that when you click the Restart button, a novel job execution is created but its job instance ID remains the same. When you click the Refresh button, our PayrollJobSubmitter servlet calls a method named restartBatchJob(), which is shown in Listing 14:

    private long restartBatchJob(long lastExecutionId) throws Exception { JobOperator jobOperator = BatchRuntime.getJobOperator(); Properties props = novel Properties(); props.setProperty("payrollInputDataFileName", payrollInputDataFileName); return jobOperator.restart(lastExecutionId, props); }

    Listing 14

    The key line in Listing 14 is the convoke to JobOperator's restart() method. This method takes a Properties object just like start(), but instead of passing a job XML file name, it passes the execution ID of the most recently failed job. Using the most recently failed job's execution ID, the batch runtime can retrieve the previous execution's last successful checkpoint. The retrieved checkpoint data is passed to the open() method of our SimpleItemReader (and ItemWriter) to enable them to resume reading (and writing) from the last successful checkpoint.

    While ensuring that your browser shows the page with a Restart button, edit the file again and remove the extraneous characters from the eighth record. Then click the Restart and Refresh buttons. The latest execution should panoply a COMPLETED status, as shown in pattern 8.

    Figure 8

    Figure 8

    It is time to peer into the log file to understand what just happened. Again, looking for messages prefixed with SimpleItemReader, Listing 15 shows what you might see:

    [SimpleItemReader] Opened Payroll File. Will start reading from record number: 7]] [SimpleItemReader] checkpointInfo() called. Returning current recordNumber: 9]] [SimpleItemReader] checkpointInfo() called. Returning current recordNumber: 10]] [SimpleItemReader] immediate called.]]

    Listing 15

    As you can see, our SimpleItemReader's open() method was called with the previous checkpoint value (which was record number 7) allowing our SimpleItemReader to skip the first six records and resume reading from the seventh record.

    Viewing Batch Jobs Using the GlassFish 4.0 Admin Console

    You can view the list of everysingle batch jobs in the JobRepository. Fire up a browser window and evanesce to localhost:4848. Then click server (Admin Server) in the left panel, as shown in pattern 9.

    Figure 9

    Figure 9

    You can click the Batch tab, which should list everysingle the batch jobs submitted to this GlassFish server. Note that the JobRepository is implemented using a database and, hence, the job details survive GlassFish 4.0 server restarts. pattern 10 shows everysingle the batch jobs in theJobRepository.

    Figure 10

    Figure 10

    You can besides click one of the IDs listed under Execution IDs. For example, clicking 293 reveals details about just that execution:

    Figure 11

    Figure 11

    More details about the execution can be obtained by clicking the Execution Steps tab on the top.

    Figure 12

    Figure 12

    Look at the statistics provided by this page. It shows how many reads, writes, and commits were performed during this execution.

    Viewing Batch Jobs Using the GlassFish 4.0 CLI

    You can besides view the details about jobs running in the GlassFish 4.0 server by using the command-line interface (CLI).

    To view the list of batch jobs, open a command window and sprint the following command:

    asadmin list-batch-jobs -l

    You should espy output similar to pattern 13:

    Figure 13

    Figure 13

    To view the list of batch JobExecutions, you can sprint this command:

    asadmin list-batch-job-executions -l

    You should espy output similar to pattern 14:

    Figure 14

    Figure 14

    The command lists the completion status of each execution and besides the job parameters passed to each execution.

    Finally, in order to espy details about each step in a JobExecution, you could consume the following command:

    asadmin list-batch-job-steps -l

    You should espy output similar to pattern 15:

    Figure 15

    Figure 15

    Take note of the STEPMETRICS column. It tells how many times ItemReader and ItemWriter were called and besides how many commits and rollbacks were done. These are extremely valuable metrics.

    The CLI output must match the Admin Console view because they both query the same JobRepository.

    You can use asadmin champion <command-name> to comeby more details about the CLI commands.

    Conclusion

    In this article, they saw how to write, package, and sprint simple batch applications that consume chunk-style steps. They besides saw how the checkpoint feature of the batch runtime allows for the easy restart of failed batch jobs. Yet, they possess barely scratched the surface of JSR 352. With the plenary set of Java EE components and features at your disposal, including servlets, EJB beans, CDI beans, EJB automatic timers, and so on, feature-rich batch applications can be written fairly easily.

    This article besides covered (briefly) the GlassFish 4.0 Admin Console and CLI champion for querying the batch JobRepository. Both the Admin Console and the CLI provide valuable details about jobs and steps that can be used to detect potential bottlenecks.

    JSR 352 supports many more exciting features such as batchlets, splits, flows, and custom checkpoints, which will be covered in future articles.

    See Also

    JSR 352

    About the Author

    Mahesh Kannan is a senior software engineer with Oracle's Cloud Application Foundation team, and he is the Expert Group Member for the Java Batch JSR. Due to his extensive undergo with application servers, containers, and distributed systems, he has served as lead architect and "consultant at large" on many projects that build innovative solutions for Oracle products.



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