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To execute a stored procedure, you have to first set up a JDBC CallableStatement object. After acquiring a connection, build a CallableStatement instance using the prepareCall() method, passing in a String describing the statement and procedure. With the example statement in hand, you need to pass in a single input parameter (the equity symbol) and also register an output parameter (a double indicating the price returned). Input parameters are populated in the same manner as using a PreparedStatement instance. For output parameters, you must use the registerOutParameter() method, which lets you declare the type of the return value as well. After setup, all you need to do is call the CallableStatement s execute() method and retrieve the result using the getDouble() method (the type of our output parameter).

There is nothing special you need to do from the client side to use stateful beans. As a matter of fact, there is virtually no difference in the client code between using a stateless and a stateful bean, other than the fact that the client can safely assume that the EJB is maintaining state even if it is sitting on a remote application server. The other remarkable thing to note about listing 2.4 is the fact that the @EJB annotation is injecting a remote EJB into a standalone client. This is accomplished by running the client in the application client container (ACC).

The application client container is a mini Java EE container that can be run from the command line. Think of it as a souped-up Java Virtual Machine (JVM) with some Java EE juice added. You can run any Java SE client such as a Swing application inside the ACC as if you were using a regular old JVM. The beauty of it is that the ACC will recognize and process most Java EE annotations such as the @EJB DI annotation. Among other things, the client container can look up and inject EJBs on remote servers, communicate with remote EJBs using RMI, provide authentication, perform authorization, and so forth. The application client really shines if you need to use EJBs in an SE application or would like to inject real resources into your POJO during unit testing.

public class RegressionRecorderInterceptor implements Interceptor, XmlLoadable { private PrintWriter out; private String version; public String getName() { return "RegressionRecorderInterceptor"; } public void importXml(Element parameter) { ... } public InvocationResponse invoke(Invocation invocation) throws Throwable { String filter = (String) invocation.getMetaData("regression", "filter"); if ((invocation.getType() != InvocationType.METHOD) || (filter != null && filter.equals("true"))) { return invocation.invokeNext(); } InvocationResponse rsp = null;

When writing entity bean create and finder methods, you want the container to manage the SQL queries and data access.

Any Java class with a main method can be run inside the ACC. Typically, though, an application client is packaged in a JAR file that must contain a MainClass in the Manifest file. Optionally, the JAR may contain a deployment descriptor

(application-client.xml) and a jndi.properties file that contains the environment properties for connecting to a remote EJB container. Let s assume you packaged up your application client classes in a JAR file named chapter2-client. jar. Using Sun Microsystems s GlassFish application server, you could launch your application client inside the ACC as follows:

This finishes our brief introduction to session beans using our ActionBazaar scenario. We are now ready to move on to the next business-tier EJB component: message-driven beans.

Every entity bean home interface has a mandatory findByPrimaryKey() method. The EJB specification has always allowed you to specify custom finder methods in the home interface for more specific and different lookups. However, in EJB 1.1 the custom finder relied on vendor-specific implementations for CMP beans. This reduced the portability of your EJBs and the power of custom finder methods. In EJB 2.0, the specification added a standard EJB query language (EJ-BQL). Using EJBQL to replace the implementation of a finder method does not in any way affect the source of an entity bean.