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The asterisk (*) can be used to denote method and class names. You will see in the Method Signatures and Package Names sections, later in this chapter, that the asterisk can also be used for signatures and package names. For methods, the asterisk designates some or all of the methods defined in a class. The following expression designates all the public methods in the Order class that have two parameters of type String and int and that return void: public void aop.aspectj.Order.*(String,int) The asterisk can be used in combination with letters to designate all the method names that contain the substring Item , for instance. In such a case, the expression is *Item*. As stated, the asterisk can also be used for class names. The following expression designates all the public methods of all the classes in the aop.aspectj package that have two parameters of type String and int and that return void: public void aop.aspectj.*.*(String,int)

This means that even if a sudden server error occurs during a commit, once the database recovers from the.

1.6 Persisting a reference to an EJB instance 1.7 Retrieving and using a persisted EJB reference 1.12 Improving your client-side EJB lookup code

One of the most tedious parts of EJB 2 development was writing the same few lines of boilerplate code many times to do a JNDI lookup whenever you needed to access an EJB or a container-managed resource, such as a pooled database connection handle. In POJOs in Action, Chris Richardson sums it up well:

A traditional J2EE application uses JNDI as the mechanism that one component uses to access another. For example, the presentation tier uses a JNDI lookup to obtain a reference to a session bean home interface. Similarly, an EJB uses JNDI to access the resources that it needs, such as a JDBC DataSource. The trouble with JNDI is that it couples application code to the application server, which makes development and testing more difficult.

An EJB client has two EJB references and needs to determine if they are references to the same bean.

Names, parameters, return types, and access modifiers (public, protected, and private), can be used in AspectJ pointcut descriptors. Method parameters can be omitted and replaced by two dots (..) to indicate any parameter. The following expression illustrates the public methods in the Order class that have any parameters and that return void: public void aop.aspectj.Order.*(..)

In EJB 3, JNDI lookups have been turned into simple configuration using metadata-based dependency injection (DI). For example, if you want to access the HelloUser EJB that we saw in listing 1.1 from another EJB or servlet, you could use code like this:

... @EJB private HelloUser helloUser; void hello(){ helloUser.sayHello("Curious George"); } ...

A client that uses many EJBs may encounter a situation that requires it to know whether multiple EJB references point to the same bean instance. For example, you may need to know if two entity beans encapsulate the same data, or if two session bean references are identical. Clients cannot use an equals() method from

Isn t that great The @EJB annotation transparently injects the HelloUser EJB into the annotated variable. EJB 3 dependency injection essentially gives you a simple abstraction over a full-scale enterprise JNDI tree. Note you can still use JNDI lookups where they are unavoidable.

Hence, the symbol of two dots handles the polymorphism of Java methods. The return type and the access modifier can be omitted and replaced by the asterisk (*). The following expression denotes all the methods defined in the Order class, regardless of their parameters, return types, and access modifiers: * * aop.aspectj.Order.*(..) In addition, the asterisk that is used to replace the access modifier can be omitted without changing the meaning of the pointcut. Therefore, the following expression is equivalent to the one just presented: * aop.aspectj.Order.*(..)

A lot of the problems with the EJB 2 persistence model were due to the fact that it was applying the container paradigm to a problem for which it was ill suited. This made the EJB 2 entity bean programming model extremely complex and unintuitive. Enabling remote access was one of the prime motivators behind making entity beans container-managed. In reality, very few clients made use of this feature because of performance issues, opting to use session beans as the remote access point.