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In order for the JMS appender to operate successfully, it must retrieve the JNDI InitialContext object for the operating environment. If the appender is initialized inside an EJB, it can make use of the InitialContext class s default constructor since the correct context is provided by the EJB container contract with the bean. However, from outside the container, the appender will need to initialize the InitialContext with environment properties. The recipe provides an example of how this can be done through the log4j configuration properties. The additional properties shown are placed into a Hashtable and used to retrieve the InitialContext for later use. Refer to the log4j API for more property information, and check your application server s documentation to learn about the required properties for the JNDI initial context.

When you specify a specific name for a parameter, it s called a named parameter. Named parameters improve the readability of code tremendously and make troubleshooting your queries much easier. The previous query can be written using named parameters as follows:

As you can see, the only difference between the positional parameter and the named parameter is the notation of the parameter itself. A positional parameter starts with a followed by the parameter s position. A named parameter starts with : and is followed by the name of the parameter. To populate a named parameter, you have to pass the name of the parameter when calling the setParameter method on the query like this:

Certain concerns can be crosscutting to the business tier and difficult to handle with J2EE design patterns. With these concerns, the GoF design patterns may be useful. As stated in 8, concerns not compatible with design patterns can often be implemented by using AOP. Indeed, AOP often offers simpler solutions than those proposed by design patterns. In this section, we study a solution for modularizing reference resolving and preconditions in the context of our case study, the banking application.

query.setParameter("price", 100.00);

Using XML is the best way to ensure that data is readable by a variety of clients. Creating a log file formatted as an XML document lets you transfer important information to a variety of applications.

This code sets the named price parameter to a value of 100.00. It also makes the developer s intent a little clearer to those reading the code. Retrieving a single entity You can retrieve a single entity instance by using the Query.getSingleResult method. Be sure that the query retrieves only one entity when using this method. For example, if we are absolutely sure that no two categories in the ActionBazaar application have exactly the same name and we are retrieving an instance of the Category by its name, we can retrieve it by using

query.setParameter(1, "Recycle from Mr. Dumpster"); Category cat = (Category)query.getSingleResult();

To log to an XML file, use the log4j XML layout class with the rolling file appender. The following properties are a sample of a log4j properties configuration file that assigns a file appender with an XML layout to a logger:

Resolving object references is usually implemented through a well-defined protocol that allows the search based on certain criterions. Within the EJB context, the Home interface defines this protocol, which is implemented by the EJB. Listing 11-6 illustrates the protocol for the account business object. Listing 11-6. The Home Interface of Account package aop.j2ee.business.entity.account; 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 import import import import import java.util.*; java.math.*; javax.ejb.*; java.rmi.RemoteException; aop.j2ee.commons.exception.MissingPrimaryKeyException;

If your query retrieves multiple instances of Category entities with the same name, it will throw NonUniqueResultException. The persistence provider will throw NoResultException when your query does not retrieve any result.

These exceptions will not roll back the active transactions. You must handle these exceptions as follows:

#setup log level and assign appenders log4j.logger.mylogger=DEBUG, xmlFileAppender #setup xmlFileAppender appender log4j.appender.xmlFileAppender=org.apache.log4j.RollingFileAppender log4j.appender.xmlFileAppender.File=Log.xml log4j.appender.xmlFileAppender.MaxFileSize=100KB log4j.appender.xmlFileAppender.MaxBackupIndex=2 log4j.appender.xmlFileAppender.layout=org.apache.log4j.xml.XMLLayout

try { ... query.setParameter(1, "Recycle from Mr. Dumpster"); Category cat = (Category)query.getSingleResult(); ... }catch (NonUniqueResultException ex) { handleException(ex); } catch (NoResultException ex) { handleException(ex); }

public interface AccountHome extends EJBHome { public Account create (String accountId, String type, String description, BigDecimal balance, BigDecimal creditLine, BigDecimal beginBalance, Date beginBalanceTimeStamp, ArrayList customerIds) throws RemoteException, CreateException, MissingPrimaryKeyException; public Account findByPrimaryKey(String accountId) throws FinderException, RemoteException; public Collection findByCustomerId(String customerId) throws FinderException, RemoteException; } // AccountHome