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You can either create ad hoc queries dynamically or use named queries that are stored with their associated entities. The EntityManager interface provides methods to create JPQL - or SQL -based queries, and the Query interface provides methods to execute a query. You can set parameters, pagination properties, and flush mode, and retrieve query results using methods in the Query interface. JPQL is the safest bet for writing queries, as it addresses the major limitations of EJBQL and is the only way to build applications that are portable across databases. Avoid using native SQL unless you have to use a vendor-specific feature. This chapter concludes part 3 of this book. Part 4 assembles everything we ve covered thus far, and allows you to apply these new skills in interesting, practical ways. We ll also delve into packaging concerns and explore some EJB design patterns.

tool that will package all of your class files along with the descriptor, but it s cumbersome to manually execute it after every source compilation. You should automate the JAR execution along with the generation of class files.

art 4 of this book provides guidelines for using EJB 3 effectively in your enterprise Java applications. 11 offers in-depth coverage of packaging EJB 3 applications and introduces deployment descriptors. 12 explores design patterns and explains how to use EJB 3 components and JPA from the web tier. In chapter 13, you ll learn best practices for building scalable applications using EJB 3.

To understand and manage a complex program, you generally divide it into smaller subprograms. Optimal partitioning criteria have been the subject of numerous studies the aim of these studies being to help developers with the design, development, maintenance, and evolution of software. When a program is written with the procedural approach, the application is modularized according to the actions or procedures to be carried out. With the object-oriented approach, on the other hand, the modularization is based on the data to be encapsulated in the classes.

Class loading concepts Packaging EJB 3 components Packaging EJB 3 entities O/R mapping with XML Deployment issues and best practices

For this step, no changes are necessary to the build properties file (created in recipe 9.1). We only need to add a dependent target to the build.xml file. The changes are shown in bold in listing 9.3.

In the previous chapters you learned how to build a business-logic tier with session and message-driven beans, and you used entities to support the persistence tier. The real success of Java EE applications lies in assembly and deployment, as this is the key to delivering on Java s promise of write once, run anywhere (WORA). If you fail to fully grasp this step, your application may not realize this level of portability. A typical application has a handful of Java classes, and maintenance can be a nightmare if you are shipping your applications from one environment to another. To simplify maintenance you can create a Java archive (JAR) file. Typically, a JAR

The Java EE platform defines different roles and responsibilities relating to development, assembly, and deployment of Java EE applications. In this book we are mainly interested in the Developer, Assembler, and Deployer roles, but we introduce you to all the roles so that you can be familiar with them. The roles defined by the specifications are

Enterprise Bean Provider Application Assembler Deployer EJB Server Provider EJB Container Provider Persistence Provider System Administrator

With both paradigms, certain functions are more difficult to modularize than others. We say that the code related to such a function is scattered.

<project name="${PROJECT_NAME}" default="all" basedir="."> <!-- set global properties for this build --> <property environment="env"/> <property file="build_ejb.properties"/> <target name="all" depends="init, compile_ejb, jar_ejb"> <echo>---------[ Project name: ${PROJECT_NAME} Completed ]--</echo> Adds the new jar_ejb target to the depends list </target> <!-================================================== Setup ready for build. Create all the necessary Directories ======================================================== --> <target name="init"> <tstamp/> <echo>---[ Creating all Directories and copying XML files ]-</echo> <mkdir dir="${BUILD}"/> <mkdir dir="${EJB_BUILD}"/> <mkdir dir="${EJB_BUILD}/META-INF"/> </target> <!-=============================================== Clean the files up =============================================== --> <target name="clean"> <tstamp/> <echo>----[ Cleaning the Compiled and Deployed Files ]------</echo> <delete dir="${BUILD}"/> </target> <!