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The idea is that a method can either return normally or throw an exception The first case corresponds to the execution of the after returning advice code, whereas the second one leads to the execution of the after throwing advice code Here is a simple example (still using pseudocode) of around advice code, which prints some tracing messages before and after the execution of the joinpoint: around void a() { Systemoutprintln("before joinpoint"); proceed(); Systemoutprintln("after joinpoint"); } Then, in an aspect, this advice code can be linked to pointcuts For example, the following aspect links the previous advice code to the pointcuts that were defined in the previous section: aspect MyAspect { a() : dataModification(); a() : calls(); a() : executions(); }.

For a component architecture to succeed in being both easy to use and flexible to extend, the ideas of interface and implementation need to be considered. The interface is the functional aspect describing what is to be done. The implementation is the specific how and what is to be accomplished. This means that if you write a logging component and you would like to have the flexibility to log to a number of locations (database, file, socket, unknown, etc.) and support various protocols (HTTP, RMI, JINI, unknown, etc.), you have a design decision to make. You can try to guess which locations and protocols are the most popular, or you can write the log functionality in an interface, write a few implementations that use that interface, and encourage others to write any implementations that they may need. The SoC idea is also sometimes referred to as the plug-in principle, which is more often how it is described. Spring allows separation of concerns with its rich support for aspect-oriented programming (AOP). It helps developers to focus on

writing business logic without having to worry about system-level concerns such as performing transactions or logging in their code. After looking more deeply into the principles Spring was built on, and with their new list of priorities for EJB 3 in hand, the EJB 3 Expert Group did several things to bring EJB 3 more in line with the goals being realized by Spring. These goals include POJO programming model, dependency injection, and use of interceptors.

Invoking a stored procedure requires you to use a BMP bean and to know how to use the stored procedure through JDBC programming. For example, examine the partial source of the PricingBean session bean shown in listing 3.23. It uses a stored procedure to determine the price of a particular equity.

At the time of this writing, the Spring framework developers released Spring 2.0 with support for the EJB 3 JPA. It shipped TopLink Essentials as the default persistence provider. It is worth mentioning that Spring is adding partial support directly for EJB 3 as a part of Pitchfork project (www.interface21.com/pitchfork). This will enable you to use EJB 3 annotations such as @Stateless, @Interceptors, and @Resource in Spring beans.

This aspect prints the specified messages around the executions of all the joinpoints that are denoted by the dataModification, calls, and executions pointcuts.

Now that you have an idea what the Spring framework is, let s explore how you can use Spring with JPA.

public class PricingBean implements SessionBean { //other bean methods and attributes not shown public double getStoredProcPrice( String symbol ){ Connection conn = null; CallableStatement cstmt = null; double price = 0;

Spring has wide support for ORM technologies, including Hibernate, TopLink, and JDO. The approach Spring takes in how you use their framework makes coding to these ORM options and swapping between them very easy. Spring 2.0 extended this rich support for ORM technologies to include JPA. Table 16.1 shows the Java classes that developers are interested in for using EJB 3 JPA in Spring.

Table 16.1 Spring classes available for using JPA Spring Class JpaTemplate JpaDaoSupport JpaTransactionManager LocalEntityManagerFactoryBean Description Simplifies JPA access code Superclass for Spring DAOs for JPA data access Used for transactional access of JPA Factory that creates local entity manager when JPA is used outside Java EE Intended to use with a persistence provider outside Java EE