Figure 829 XDoclet Generated Code in Java

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Figure 829 XDoclet Generated Code
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Iteration 2: Developing Session EJBs
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6 The EJB wizard created a bean class that is already annotated with XDoclet tags for a stateless session bean The XDoclet engine uses these tags to determine the type of the EJB, its JNDI name, the business methods, and the bean s transaction and security attributes WTP extends the Java source editor to provide code assist support for XDoclet annotations (see Figure 830)
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Figure 830 Code Assist for XDoclet
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You can design the work done by the bean into units called transactions All EJBs are transactional by default unless you explicitly make them nontransactional You can either explicitly handle transactions in your business methods or you can delegate this responsibility to the EJB container These alternatives are referred to as bean-managed and container-managed transaction demarcation In container-managed transaction demarcation, the container ensures that a unit of work either fully completes or is fully rolled back We prefer container-managed transactions because you do not have to deal with issues such as failure recovery and concurrent access in your code Although session and message-driven beans can use either bean-managed or container-managed transactions, entity beans must use container-managed
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CHAPTER 8 The Business Logic Tier
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transactions You will modify the generated code to add an annotation for the transaction attribute Use the XDoclet code assist to add the @ejbtransaction tag and set its type to Supports (see Figure 831)
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Figure 831 Transaction Demarcation with Annotations
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If the client calls the EJB with a transaction context, the container invokes the EJB in the client s transaction context This means your EJB can participate in a transaction if the caller has already initiated a transaction However, if there is no transaction, it will execute the method without a transaction The Supports type therefore allows the EJB to operate in both cases Next you will implement the business methods described in the LeagueFacade interface To do this you must implement the interface in the LeagueFacadeBean class and add the methods But wait! The domain model is in a different project To use it, you need these classes to be on your classpath You need to compile the EJB classes with them, but you do not want to include the model classes in the EJB module They should be deployed to the server runtime environment separately WTP allows you to describe the dependencies between J2EE modules With module dependencies, WTP can automatically maintain the project classpaths and assemble them to deploy a complete application to a server environment To set dependencies you will: 1 Include all EJB modules in the LeaguePlanetEAR enterprise application 2 Add the LeaguePlanetModel utility module to LeaguePlanetEAR 3 Make the LeaguePlanetEJB and LeaguePlanetEJBClient modules dependent on LeaguePlanetModel because you will use these types in your business methods
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Iteration 2: Developing Session EJBs
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To make these changes, do the following: 1 In the Project Explorer, select the LeaguePlanetEAR project Right click, and invoke the Properties menu item The project properties dialog opens Click on the J2EE Module Dependencies to open the module dependencies page (see Figure 832)
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Figure 832 Properties for LeaguePlanetEAR
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2 In this page you can add existing J2EE modules to LeaguePlanetEAR You can also add binary JARs, such as strutsjar, to an EAR Check LeaguePlanetModel to add it to the enterprise application Click the OK button to accept your changes 3 Next select the LeaguePlanetEJB project in the Project Explorer, right click, invoke the Properties menu item as before, and navigate to the J2EE Module Dependencies page (see Figure 833) 4 You can now define the module dependencies among the modules that are contained in the same enterprise application Notice that the EJB module is already dependent on the EJB client module Check LeaguePlanetModel to add it to the list Click the OK button to accept your changes
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CHAPTER 8 The Business Logic Tier
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Figure 833 J2EE Module Dependencies for LeaguePlanetEJB
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5 Next select the LeaguePlanetEJBClient project in the Project Explorer, right click, and repeat the same process to add a dependency to LeaguePlanetModel (see Figure 834) Now you can use the model objects to finish the implementation of your stateless session bean Your stateless session bean will use your service fa ade implementation to call League Planet services The first thing to do is to initialize the stateless session bean The ejbCreate method is the correct place to do this Edit LeagueFacadeBeanjava so that it matches Example 89 Save your code You have completed programming your EJB Note that the XDoclet engine updates all generated classes according to your new implementation
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