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In the examples of the TraceAspect and TraceAspect2 aspects, you learned that the pointcut method defines pointcuts. The first parameters passed to this method are expressions that deal with the definitions of the classes, objects, and methods included in the pointcut. In this section, we present the three cases in which a wrapper can be associated with a pointcut. In the first and most frequent case, defining the wrapper requires two parameters: wrapperClassName, which is a string that defines the wrapper class name; and one2one, which is a Boolean value. The wrapper class must be a subclass of org.objectweb.jac.core.Wrapper. In all cases, JAC dynamically instantiates the specified wrapperClassName class. When this instantiation occurs, it depends on the value of one2one: A value of false causes all the joinpoints included in the pointcut to share the same wrapper. In this case, the wrapper is a singleton. A value of true causes each joinpoint included in the pointcut to be associated with a dedicated instance of the wrapper class. The value false generates fewer objects and thus saves memory. However, if the wrapper is stateful and the state depends on the joinpoint, the sharing can lead to inconsistencies. In such a case, it is easier to have one dedicated instance of a wrapper for each joinpoint and use the value true for one2one.

Figure 10.1 The JPA query API includes EntityManager methods to create queries, the methods in the Query interface for executing the query, and the Java Persistence Query Language.

Table 10.1 Comparing a JDBC basic query to a JPA query. The JDBC SQL query returns the data in the database table whereas the JPQL query returns JPA entities. Basic Steps for JDBC Query Using SQL 1. Obtain a database connection. 2. Create a query statement. 3. Execute the statement. 4. Retrieve the results (database records). Basic Steps for a JPA Query Using JPQL 1. Obtain an instance of an entity manager. 2. Create a query instance. 3. Execute the query. 4. Retrieve the results (entities).

You have added logging code to your entire EJB application, but now you ve noticed a performance degradation. Logging can affect the performance of your application in a number of ways. log4j is probably the fastest logger you can find, but depending on how you use it, you can hurt your application performance. The two most common areas that affect performance are the number of log messages and the construction of log messages.

The query API supports two types of queries: named and dynamic. Named and dynamic queries have different purposes. Named queries are intended to be stored and reused. For instance, suppose your application requires you to list the most popular item in a specific category. Since this requirement occurs in several places in your application, you know this query will be executed by multiple modules. You d probably want to create a named query so you wouldn t have to build the query every time you wanted to query the most popular item in that category. On the other hand, say you have a requirement to build a query screen for items and you want to dynamically create the query statement based on user inputs or some conditions in your application logic. In this case, you d have to use a dynamic query. Dynamic (or ad hoc) queries are different from named queries in that they are created on the fly. In either case, the format of the queries is similar. For a first taste of how a query works, let s look at an example, starting with a dynamic query. Suppose we want to retrieve all the categories in the system. The following code will perform the desired task:

@PersistenceContext em; Injects EntityManager Creates query ... instance public List findAllCategories() { Query query = em.createQuery("SELECT c FROM Category c"); ... return query.getResultList(); ............ }