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javax.ejb.ActivationConfigProperty Specifies a name-value pair of configuration properties that may be used for an MDB to receive messages from a message source.

@Target({}) @Retention(RUNTIME) public @interface ActivationConfigProperty { String propertyName(); String propertyValue(); }

Using a value object for an entity bean is a quick and easy way to improve the performance of your EJB applications. For instance, for a large amount of data you can save several method calls to an entity bean. Many developers create value objects by extending a Map class, allowing any number of future fields to be added to the class. Using a subclass of Map lets you add and retrieve key/value pairs to the value object as needed using the super class put() and get() methods.

These annotations are used to inject both EJBs and resources. javax.ejb.EJB Injects an EJB reference into a field or method.

Summary

@Target({TYPE, METHOD, FIELD}) @Retention(RUNTIME) public @interface EJB { String name() default ""; Class beanInterface() default Object.class; String beanName() default ""; Vendor-specific JNDI bean name String mappedName() default ""; String description() default ""; }

A session bean uses a query that returns an enormous result set too large to pass back to a client in one chunk. You would like to page through the data.

javax.ejb.EJBs Denotes references to multiple EJBs. Used at the class level. This annotation is not discussed in this book. We encourage you to explore it on your own.

@Target(TYPE) @Retention(RUNTIME) public @interface EJBs { EJB[] value(); }

In this chapter, you saw how AOP by verifying that an application s definition and execution correspond to its identified requirements can be used to improve the application s Quality of Service. First, we showed how AOP can help to implement contracts in a straightforward way. Second, we showed the AOP implementation of two testing techniques: coverage analysis and nonregression tests. Finally, we showed how to use AOP for the seamless integration of JMX with a Java application. Our AOP implementations did not provide more features than the existing tools do. However, our implementations showed how AOP can be used at a developmental level to improve code quality without needing any specific support. Besides, an important advantage of AOP technologies is that it provides the ability to plug and unplug Quality of Service support when needed even at run time if dynamic AOP tools are used.

@Target({TYPE, METHOD, FIELD}) @Retention(RUNTIME) public @interface Resource { public enum AuthenticationType { CONTAINER, APPLICATION } String name() default ""; Class type() default Object.class; AuthenticationType authenticationType() default AuthenticationType.CONTAINER; boolean shareable() default true; Vendor-specific resource name String mappedName() default ""; String description() default ""; }

Using session beans to query databases via JDBC calls is an effective way to present data to an EJB client. However, if a query returns hundreds of rows, you cannot possibly expect your application to return all the data at one time to a client. Paging through data is an excellent way for clients to navigate through large result sets.

javax.annotation.Resources Denotes references to multiple resources. Used at the class level. This annotation is not discussed in this book. We encourage you to explore it on your own.

@Target(TYPE) @Retention(RUNTIME) public @interface Resources { Resource[] value(); }

Creating a page-able session bean requires you to perform a little different JDBC connection setup. This recipe shows a generic mechanism that you can alter to fit your needs. The following session bean operates over an SQL statement that is passed to it by the client. Clients can then use the next() and previous() methods to return a manageable set of data as needed. Clients would use the bean in the following order: