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The second case is rather similar to the first. Three parameters instead of two must be passed to define the wrapper. They are the wrapper class name; the Boolean one2one; and initParameters, which is an array of objects. This last parameter contains the initial values that must be passed when instantiating the wrapper. With the last case, you pass a unique parameter named wrappee. This parameter must implement the org.objectweb.jac.core.Wrapper type. The instance will be used to wrap all the joinpoints included in the pointcut. This case is useful when the wrapper cannot be easily created by the framework, or when you want to use a customized instance of a wrapper.

In this example, we first grab an instance of an EntityManager provided by dependency injection b. Then we create an instance of a Query object for querying entities using the EntityManager.createQuery method C, passing it the query

There are four ways to improve the log4j performance:

string. (In section 10.2 we discuss the Query interface in more detail.) Once we have a query instance, the final step is to return the results list D using its getResultList method. Note that in this example we used JPQL to query the entities. You can use either JPQL or native SQL in both named and dynamic queries. A named query will be almost the same: the only difference is that it uses createNamedQuery rather than createQuery, and you must pass it a query object that has already been created rather than a query string. In the next section, you ll learn how to create that object for JPQL queries. We ll discuss creating the named query object for SQL queries in section 10.4.

You must create a named (or static) query before you can use it. It is defined either in the entity using annotations, or in the XML file defining O/R mapping metadata. You ll learn about O/R mapping and how to define a named query with XML in chapter 11. A named query is accessed by its name when you create an instance of it. Any query that is used in multiple components of your applications is a candidate for a named query. Named queries have three primary benefits:

In the previous section, you learned how to define a pointcut with JAC. In this section, you will learn how to write wrappers. Programming an aspect with JAC consists of writing at least two classes: one (such as TraceAspect2) for the definition of pointcuts, and one for each wrapper associated with a pointcut. This allows you to easily reuse pointcut definitions independently from wrappers and vice versa. Wrapper classes with JAC must extend the org.objectweb.jac.core.Wrapper class, which is the root class of all existing wrappers. All wrappers are around wrappers. Wrapper instances are created either by JAC or by you when you define the pointcuts. In all cases, a link is maintained between the aspect and the wrapper instances. This link comes into existence when a wrapper is instantiated; the wrapper provides a constructor that takes the instance of the associated aspect as a parameter. This parameter implements the org.objectweb.jac.core.AspectComponent type, which is the root class of all JAC aspects. A typical definition of a wrapper class starts with the following lines of code: import org.objectweb.jac.core.AspectComponent; import org.objectweb.jac.core.Wrapper; public class MyWrapper extends Wrapper { public MyWrapper(AspectComponent ac) { super(ac); } With JAC, two types of joinpoints exist: method executions and constructor executions. The before and after code that is executed around these joinpoints is defined in the invoke and construct methods, which are presented in the following sections.

Adjust the logger level. Construct your messages economically. Use formatting with caution. Use a fast appender layout class.

They improve reusability of queries. They improve maintainability of code; queries are not scattered among the business logic. They can enhance performance because they are prepared once and can be efficiently reused.

Although a named query can also be stored in the ORM XML file, in this chapter we focus on using it with metadata annotations. Let s look at an example. Say you want to create a named query on the Category entity to retrieve all categories by passing a category name. To achieve this, use the @javax.persistence.NamedQuery annotation:

Change the level of your loggers A large application might have thousands of log messages of varying levels. Modify your logging configuration file to output only the absolutely necessary messages into your logs. Disabling messages will improve the overall performance of your application. For example, if you have tested your application in production, you might want to turn off the debugging statements that are no longer necessary.

@Entity @NamedQuery( name = "findAllCategories", query = "SELECT c FROM Category c WHERE c.categoryName LIKE :categoryName ") public class Category implements Serializable { .. }