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The Spring JDBC framework only maps well-known error codes. Sometimes you may wish to customize the mapping yourself. For example, you might decide to add more codes to an existing category or define a custom exception for particular error codes. In Table 3-2, the error code 23505 indicates a duplicate key error in Apache Derby. It is mapped by default to DataIntegrityViolationException. Suppose that you want to create a custom exception type, MyDuplicateKeyException, for this kind of error. It should extend DataIntegrityViolationException because it is also a kind of data integrity violation error. Remember that for an exception to be thrown by the Spring JDBC framework, it must be compatible with the root exception class DataAccessException. package com.apress.springenterpriserecipes.vehicle; import org.springframework.dao.DataIntegrityViolationException; public class MyDuplicateKeyException extends DataIntegrityViolationException { public MyDuplicateKeyException(String msg) { super(msg); } public MyDuplicateKeyException(String msg, Throwable cause) { super(msg, cause); } }

Creating EJB 2.x Components Without Spring s Support First, let s create the EJB component without Spring s support. To allow remote access to this EJB component, you expose the following remote interface to clients.

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By default, Spring will look up an exception from the sql-error-codes.xml file located in the org.springframework.jdbc.support package. However, you can override some of the mappings by providing a file with the same name in the root of the classpath. If Spring can find your custom file, it will look up an exception from your mapping first. However, if it does not find a suitable exception there, Spring will look up the default mapping. For example, suppose that you want to map your custom DuplicateKeyException type to error code 23505. You have to add the binding via a CustomSQLErrorCodesTranslation bean, and then add this bean to the customTranslations category. < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"> <beans> <bean id="Derby" class="org.springframework.jdbc.support.SQLErrorCodes"> <property name="databaseProductName"> <value>Apache Derby</value> </property> <property name="useSqlStateForTranslation"> <value>true</value> </property> <property name="customTranslations"> <list> <ref local="myDuplicateKeyTranslation" /> </list> </property> </bean> <bean id=" myDuplicateKeyTranslation" class="org.springframework.jdbc.support.CustomSQLErrorCodesTranslation"> <property name="errorCodes"> <value>23505</value> </property> <property name="exceptionClass"> <value> com.apress.springenterpriserecipes.vehicle.DuplicateKeyException </value> </property> </bean> </beans> Now if you remove the try/catch block surrounding the vehicle insert operation and insert a duplicate vehicle, the Spring JDBC framework will throw a MyDuplicateKeyException instead. However, if you are not satisfied with the basic code-to-exception mapping strategy used by the SQLErrorCodes class, you may further implement the SQLExceptionTranslator interface and inject its instance into a JDBC template via the setExceptionTranslator() method.

Another issue is that each activity must produce an artifact a tangible product such as a specification, plan, or other document which will then be the input for the next activity in the sequence Only the construction activity produces something that is actually useful to the client, which is the working software The analysis, architecture, and design activities each produce a document that s used exactly once, and then is thrown away This is an inefficient way to develop software A better approach is to sequence the activities so that lower layers are completed before work starts on the higher layers, building the application from the ground up (Figure 3-5) This avoids many of the problems of the waterfall approach, but it still introduces an artificial dependency that s unlikely to be justified.

s Note To compile and build your EJB component, you have to include the library that contains standard

EJB classes and interfaces in your classpath. For OpenEJB 3.0 beta 1, it s geronimo-ejb_3.0_spec-1.0.

Suppose you are developing a course management system for a training center. The first class you create for this system is Course. This class is called an entity class or a persistent class because it represents a

jar (located in the lib directory of the OpenEJB installation).

real-world entity and its instances will be persisted to a database. Remember that for each entity class to be persisted by an ORM framework, a default constructor with no argument is required. package com.apress.springenterpriserecipes.course; ... public class Course { private private private private private Long id; String title; Date beginDate; Date endDate; int fee;

package com.apress.springrecipes.post; import java.rmi.RemoteException; import javax.ejb.EJBObject; public interface PostageServiceRemote extends EJBObject { public double calculatePostage(String country, double weight) throws RemoteException; } This calculatePostage() method has a signature similar to that in the business interface, except it declares throwing RemoteException. Also, you need a remote home interface for clients to retrieve a remote reference to this EJB component, whose methods must declare throwing RemoteException and CreateException. package com.apress.springrecipes.post; import java.rmi.RemoteException;

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