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Like any software development project, migrating your applications to use EJB 3 may be quite challenging. A thorough understanding of your applications and knowledge of EJB 3 is required. If you re migrating EJB 2 applications to EJB 3, you have to understand that other applications may have a dependency on your application. Making the jump to EJB 3 may break the dependent applications, because the client view of EJBs has changed.

In many situations, the objects involved in a program cannot communicate directly through local method calls. For example, objects in a distributed program are separated by a network. In such situations, a proxy is used to transfer the communications from client to server over the network. Distribution is not the only situation where proxies are useful. For example, if the access to an object needs to be restricted to authorized users, a proxy can be inserted to perform access checks. A proxy is an object that acts as a representative for another object. A proxy can be generic; in this case, it acts as a representative for any kind of object. Conversely, a proxy can be specific and implement the same interface as the object it is representing. The treatments performed by the proxy are out of the scope of design patterns. The simplest existing proxy delegates the call to the main object without performing any additional treatments. In the remainder of this section, we take the example of a proxy that performs access control checks.

14.7.1 Strategies Depending on the size of your applications, and the number of applications you plan on upgrading, the strategy you choose could have a big impact on your success. You may go for either a phased approach or an all-at-once approach, depending on your comfort level with your code base and the availability of resources. An incremental approach may be better suited for most applications if you aren t comfortable with the technology. It allows you to validate the technology, gives you firsthand experience through trial and error, and has minimal impact on the complete application. Our advice is that you consider an agile approach to migration, and properly test your application after migrating only a small portion. Testing as you go along will give you confidence that you are on the right track, and let you know fairly quickly if you ve gone off the rails. Of course, there are situations where it may not be practical to follow an incremental migration strategy. Only you know

public interface PortfolioHoldingHome extends EJBHome { public PortfolioHolding create(PortfolioHoldingVO holding)

the capabilities of your team, your corporate culture, and the unique pressure associated with keeping your applications in a production-ready state.

It is evident from our earlier discussions in this chapter that migration is mostly a mechanical and boring chore, and finding the right resources for such a task may be challenging. We certainly expect that many development tools will emerge promising to automate 100 percent of the migration workload. However, we recommend that you not rely completely on such tools. Tools can certainly simplify the migration process, but will require some degree of guidance so that your knowledge of your applications is taken into consideration during the process. Tools can ease your task in converting classes to use EJB 3, but the resulting application may not be foolproof due to the scores of changes in the programming model between EJB 2 CMP entity beans and the EJB 3 JPA. We suggest you try migrating a part of your application with the tool and then examine the entire application to determine whether it behaves as expected. In many cases, you ll want to change your domain model. In such situations your intervention will most likely be required because you are the only one who can make these decisions.

Our implementation of the Proxy design pattern for access control checks relies on an abstract aspect. Concrete aspects will be defined later when we set the authorization rights and denote the actual methods where the checks are to be applied.

throws CreateException, RemoteException; public PortfolioHolding findByPrimaryKey(HoldingKey primaryKey) throws FinderException, RemoteException; public Collection findByPortfolioName(String portfolioName) throws FinderException, RemoteException; }

14.8 Summary