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Listing 6-6. A More Complex Configuration Example <beans> ... <bean id="moreComplexObject" class="example.ComplexObject"> <property name="someList"> <list> <value>a list element </value> <ref bean="aReferencedBean"/> </list> </property> <property name="someMap"> <map> <entry key="an entry key"> <value>some value</value> </entry> <entry key="another entry key for a reference"> <ref bean="myDataSource"/> </entry> </map> </property> <property name="someSet"> <set> <value>some string</value> <ref bean="myDataSource"/> </set> </property> </bean> </beans> We summarize all the available data elements in the following list: bean: Inlines a bean definition (in this case, the bean can be anonymous and the id attribute is not needed) ref: Defines a reference to another bean idref: Defines a string value that corresponds to a bean id (in this case, the factory checks that the id exists in the application environment) list: Defines a list of any other elements set: Defines a set of any other elements map: Defines a map of entries (entry attribute) props: Defines a java.util.Properties element value: Defines a primitive value null: Defines a null value (indeed, <value\> defines an empty string and should be replaced by <null\> when needed)

The goal of the Eclipse Dali project (http://wiki.eclipse.org/index.php/ Dali_Project) is to provide developer support for O/R mapping of EJB 3 persistence objects, and help generate O/R mappings with annotations and XML descriptors.

To execute the task, you need to specify a few arguments: a URL to the server, and three other target names that can be executed by the Cactus task in order to stop or start your application server and to actually execute test cases. The <runservertests> task will want to check whether the application server is already running before invoking the target that starts the server. It does this by examining the cactus.properties file found in the classpath. In this properties file (if it exists), the Cactus task will find a URL to the application server it can use to test whether it is running. If the application server is already running, it will not

Our trek through packaging EJB 3 is nearing the end. Before we finish, we want to highlight some things you should keep in mind when packaging your shiny new EJB 3 applications.

After reading this chapter it may appear that a lot of little pieces are required in order to deploy EJB 3 components. That may not be all that far from the truth. The reality, though, is that you don t have to keep track of all the pieces yourself; tools provided by the application servers help, and much of the glue code can be automated. You need to keep in mind some key principles, regardless of which components your application makes use of and which server you plan to deploy it to.

All of these data elements are also recursively available within a property, an entry, a set, or a list element.

The following list of best practices can make your life easier while you re building and deploying your applications:

attempt to start it. Once the server is running, the Cactus task will invoke the test target, and then the stop server target. For example, if you choose to provide a cactus.properties file, it might contain something like the following:

Understand your application and its dependencies. Make sure that resources are configured before you deploy the application in your target environment. If an application requires a lot of resources, it is a good idea to use the deployment descriptor to communicate the dependencies for the deployer to resolve before attempting to deploy the application. Improper packaging of classes and libraries causes a lot of class-loading issues. You also need to understand the dependency of your applications on helper classes and third-party libraries and package them accordingly. Avoid duplication of libraries in multiple places. Instead, find a way to package your applications, and configure your application server such that you can share common libraries from multiple modules within the same application. Avoid using proprietary APIs and annotations. Don t use vendor-specific tags or annotations unless it s the only way to accomplish your task. Weigh doing so against the disadvantages, such as making your code less portable. If you are depending on proprietary behavior, check whether you can take advantage of a proprietary deployment descriptor. Leverage your DBA. Work with your DBA to automate creation of any database schemas for your application. Avoid depending on the automatic table creation feature for entities, as it may not meet your production deployment requirement. Make sure that the database is configured properly, and that it does not become a bottleneck for your application. Past experience indicates that making friends with the DBA assigned to your project really helps! If your application requires other resources such as a JMS provider or LDAPcompliant security provider, then work with the appropriate administrators to configure them correctly. Again, using O/R mapping with XML and resource dependencies with XML descriptors can help you troubleshoot configuration issues without having to fiddle with the code.