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Packaging of persistence units We didn t talk much about the packaging of persistence units you didn t need to package the Hello World example for any of the deployments. However, if you want to use features such as hot redeployment on a full application server, you need to package your application correctly. This includes the usual combination of JARs, WARs, EJB-JARs, and EARs. Deployment and packaging is often also vendor-specific, so you should consult the documentation of your application server for more information. JPA persistence units can be scoped to JARs, WARs, and EJB-JARs, which means that one or several of these archives contains all the annotated classes and a META-INF/persistence.xml configuration file with all settings for this particular unit. You can wrap one or several JARs, WARs, and EJB-JARs in a single enterprise application archive, an EAR. Your application server should correctly detect all persistence units and create the necessary factories automatically. With a unit name attribute on the @PersistenceContext annotation, you instruct the container to inject an EntityManager from a particular unit.

What if you have a set of files that you want to pass in as parameters to some native program How can you do it If you know in advance the list of files, you can just repeat the task, but that makes maintenance worse. You could use a special task <antcall> to call targets dynamically; this complex task has not been covered yet because it has many subtle issues. For the special problem of passing a list of files to an external executable, there is a better solution: <apply>. This task takes a fileset and hands it off to the named application, either in one go or one at a time. Apply is implemented as a subclass of <exec>, so all the attributes of that task can be used with <apply>, with the additional feature of bulk execution. Let s start with an example. Suppose we have a native program that converts XML files to PDF, which takes two command-line parameters: the path to an XML file, and a path to the resultant PDF file. Before we go crazy and accidentally run our program destructively, let s first just have it output to the screen what it would do. This is a nice way to develop the use of <apply> in your build files so that you can see what it s going to, giving you the chance to tweak the parameters.

Full portability of an application isn t often a primary reason to use JPA or EJB 3.0. After all, you made a decision to use Hibernate as your JPA persistence provider. Let s look at how you can fall back and use a Hibernate native feature from time to time.

You decided to use Hibernate as a JPA persistence provider for several reasons: First, Hibernate is a good JPA implementation that provides many options that don t affect your code. For example, you can enable the Hibernate second-level data cache in your JPA configuration, and transparently improve the performance and scalability of your application without touching any code. Second, you can use native Hibernate mappings or APIs when needed. We discuss the mixing of mappings (especially annotations) in chapter 3, section 3.3,

<apply executable="cmd" dest="docs"> <arg line="/c echo"/> <arg value="convert"/> <srcfile/> <targetfile/> <fileset dir ="." includes="*.xml"/> <mapper type="glob" from="*.xml" to="*.pdf"/> </apply>

Object/relational mapping metadata, but here we want to show how you can use a Hibernate API in your JPA application, when needed. Obviously, importing a Hibernate API into your code makes porting the code to a different JPA provider more difficult. Hence, it becomes critically important to isolate these parts of your code properly, or at least to document why and when you used a native Hibernate feature. You can fall back to Hibernate APIs from their equivalent JPA interfaces and get, for example, a Configuration, a SessionFactory, and even a Session whenever needed. For example, instead of creating an EntityManagerFactory with the Persistence static class, you can use a Hibernate Ejb3Configuration:

We are running on a Windows platform, and use the built-in echo command. We must set our executable to cmd for echo to work properly, and the /c switch causes the command shell to exit after echo completes. Our output, run on a directory with several XML files, is:

Ejb3Configuration cfg = new Ejb3Configuration(); EntityManagerFactory emf = cfg.configure("/custom/hibernate.cfg.xml") .setProperty("hibernate.show_sql", "false") .setInterceptor( new MyInterceptor() ) .addAnnotatedClass( hello.Message.class ) .addResource( "/Foo.hbm.xml") .buildEntityManagerFactory(); AnnotationConfiguration hibCfg = cfg.getHibernateConfiguration();

[apply] convert C:\AntBook\Sections\Learning\callingotherprograms\apply.xml C:\AntBook\Sections\Learning\callingotherprograms\docs\apply.pdf [apply] convert C:\AntBook\Sections\Learning\callingotherprograms\execution. xml C:\AntBook\Sections\Learning\callingotherprograms\docs\execution.pdf [apply] convert C:\AntBook\Sections\Learning\callingotherprograms\java.xml C

The Ejb3Configuration is a new interface that duplicates the regular Hibernate Configuration instead of extending it (this is an implementation detail). This means you can get a plain AnnotationConfiguration object from an Ejb3Configuration, for example, and pass it to a SchemaExport instance programmatically. The SessionFactory interface is useful if you need programmatic control over the second-level cache regions. You can get a SessionFactory by casting the EntityManagerFactory first:

HibernateEntityManagerFactory hibEMF = (HibernateEntityManagerFactory) emf; SessionFactory sf = hibEMF.getSessionFactory();

:\AntBook\Sections\Learning\callingotherprograms\docs\java.pdf [apply] convert C:\AntBook\Sections\Learning\callingotherprograms\probes.xml C:\AntBook\Sections\Learning\callingotherprograms\docs\probes.pdf [apply] convert C:\AntBook\Sections\Learning\callingotherprograms\shells.xml C:\AntBook\Sections\Learning\callingotherprograms\docs\shells.pdf

The same technique can be applied to get a Session from an EntityManager: