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Packaging EJB 3 applications
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Table 11.5 Mapping of persistence annotations to associated deployment descriptor elements (continued) Annotations Grouped by Type Listeners (continued) @PostUpdate @PrePersist @PostPersist @PreRemove @PostRemove @PostLoad post-update pre-persist post-persist pre-remove post-remove post-load XML Element
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Manually performing O/R mapping using XML can be quite arduous, errorprone, and difficult to troubleshoot. You may want to investigate tools that will assist with this effort.
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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.
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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.
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11.5 Best practices and common deployment issues
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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.
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11.5.1 Packaging and deployment best practices
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The following list of best practices can make your life easier while you re building and deploying your applications:
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Best practices and common deployment issues
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.
Now that you have some best practices in place, what do you do when that s still not enough We ll let you in on a few secrets from the trenches that will make solving those packaging problems easier.
11.5.2 Troubleshooting common deployment problems
This section examines some common deployment problems that you may run into. Most can be addressed by properly assembling your application.
ClassNotFoundException occurs when you re attempting to dynamically
load a resource that cannot be found. The reason for this exception can be
Packaging EJB 3 applications
a missing library at the correct loader level; you know, the JAR file containing the class that can t be found. If you re loading a resource or property file in your application, make sure that you use Thread.currentThread().getContextClassLoader().getResourceAsStream().
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