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Most persistence providers include a great developer-friendly feature known as automatic schema generation. The persistence provider will automatically create database objects for your entities when they do not exist in the database. This behavior is not mandated by specification and is configured using vendor-specific properties. Most of our code examples rely on automatic schema generation. In chapter 11, we ll provide an example configuration to enable automatic schema generation.

private TestStateless createSession( TestStatelessHome home ) throws ObjectNotFoundException, CreateException,RemoteException { TestStateless session = null; System.out.println("Creating Session"); session = (TestStateless) PortableRemoteObject.narrow( home.create(), TestStateless.class); System.out.println("Created Session "); return session; }

We won t discuss the catalog and schema parameters in depth since they are hardly ever used. In effect, they allow you to fully qualify the mapped table. For example, we could have explicitly specified that the USERS table belongs in the ACTIONBAZAAR schema like so:

public class TraceInterceptor implements Interceptor { public String getName() { return "TraceInterceptor"; } public Object invoke(Invocation invocation) throws Throwable { // ... Before code Object ret = invocation.invokeNext(); // ... After code return ret; } }

We ve already discussed what a schema is. For all intents and purposes, you can think of a catalog as a meta-schema or a higher-level abstraction for organizing schemas. Often, a database will only have one common system catalog.

private TestStatelessHome lookupHome() throws NamingException{ Context ctx = new InitialContext(); System.out.println("Looking up Home:"); TestStatelessHome home = (TestStatelessHome) ctx.lookup("testStateless"); home = (TestStatelessHome) PortableRemoteObject.narrow( home, TestStatelessHome.class); return home; } }

By default, it is assumed that the table belongs in the schema of the data source used. You ll learn how to specify a data source for a persistence module in chapter 11 when we discuss entity packaging. The uniqueConstraints parameter is not used that often either. It specifies unique constraints on table columns and is only used when table autocreation is enabled. Here s an example:

@Table(name="CATEGORIES", uniqueConstraints= {@UniqueConstraint(columnNames={"CATEGORY_ID"})})

Besides the ability to declare pointcuts in XML files or with annotations, JBoss AOP offers the possibility of dynamically declaring and weaving a pointcut. The code snippet in Listing 5-13 illustrates this feature. Listing 5-13. Dynamic Weaving 1 2 3 4 5 6 import org.jboss.aop.AspectManager; import org.jboss.aop.advice.AdviceBinding; AdviceBinding ab = new AdviceBinding( "execution(* *->foo(..)" ); ab.addInterceptor( myInterceptor.class ); AspectManager.instance().addBinding( ab );

Running tests against stateless session beans is a simple matter of looking up the bean and executing its business methods. You can choose to either catch exceptions or evaluate return values to determine if the test is successful. Notice that both test methods in our recipe invoke private methods to create an instance of the stateless session bean. To save time and improve the performance of your tests, you can factor out the EJB lookup by storing the bean reference in a local class member variable. Each test method can then check the member variable for an existing reference before performing another EJB lookup. Notice that the test methods use assertXXX() methods to perform test comparisons to determine success or failure conditions for the tested business logic. Test cases inherit these methods from the JUnit Assert class. Table 9.1 lists additional assertXXX() methods that are available in the JUnit API.

If it does not exist and autogeneration is enabled, the code puts a unique constraint on the CATEGORY_ID column of the CATEGORIES table when it is created during deployment time. The uniqueConstraints parameter supports specifying constraints on more than one column. It is important to keep mind, however, that EJB 3 implementations are not mandated to support generation of tables, and it is a bad idea to use automatic table generation beyond simple development databases. Most entities will typically be mapped to a single table. The User object happens to be mapped to two tables, as you might have guessed from the @SecondaryTable annotation used in listing 8.4. We ll come back to this later after we take a look at mapping entity data using the @Column annotation.