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The final step for this recipe resides in the documentation of your application server. You need to assign users to particular roles in the server (which are then mapped to logical roles in the bean s deployment XML).

transactional system, this is important to keep transaction life span to a minimum As an added benefit, moving the transactions to a single layer makes it easy to centralize the transaction configurations Each method in the service layer should be stateless That is, each call to a service method creates no state on the object implementing the service interface No single method call on a service object should assume any previous method calls to itself Any state across method calls is kept in the domain model In a typical Spring MVC application, a single service layer object will handle many concurrent threads of execution, so remaining stateless is the only way to avoid one thread clobbering another This actually leads to a much more simple design, because it eliminates the need to pool the service objects.

Here s the output:

The code in the recipe sets the username, password, and authentication mechanism for the client application. This information is passed to the container when the client attempts to look up or use a bean. The credentials are compared to a specific bean s security requirements to determine whether the client has enough privileges to use the bean. Additionally, beans can programmatically retrieve this information for use in method implementations to make flow decisions.

This design performs much better than a pool of instances, because there is no management of checking the object in and out of the pool Using a singleton for each service object keeps memory usage to a minimum as well This layer attempts to provide encapsulations of all the use cases of the system A single use case is often one transactional unit of work, and so it makes sense these two aspects are found in the service layer It also makes it easy to refer to one layer for all the high-level system functionality Consolidating the units of work behind a service layer creates a single point of entry into the system for end users and clients It now becomes trivial to attach multiple client communication mechanisms to a single service interface.

You have seen several occasions in which special characters had to be escaped because they were not to be evaluated using their normal meanings. This occurs frequently in sed operations, particularly replacements. These replacements can be somewhat tricky because of all the backslashes and forward slashes. The next few examples show the code for several replacement operations. The code works within a script, but because of the way the shell evaluates escape characters, the code will not work from the command line in case you want to test the code manually. There are two possibilities for most of these examples. The first uses escapes to search for and replace the special characters. The second uses square brackets ([ and ]) to specify the character in the search.

While you want to allow an EJB client to find and use a particular EJB, you want to expose only a limited set of methods to that client. Your goal is to hide a set of business methods, and possibly even particular home interface methods. For example, certain methods need to be available only to users in the Administrator role. Perhaps methods that make security changes, or critical data changes, should be hidden from normal users. EJBs use method permissions to further guarantee that the correct users are accessing methods.

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