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The Spring framework offers a consistent data access exception-handling mechanism for its data access module, including the JDBC framework. In general, all exceptions thrown by the Spring JDBC framework are subclasses of DataAccessException, a type of RuntimeException that you are not forced to catch. It s the root exception class for all exceptions in Spring s data access module. Figure 3-1 shows only part of the DataAccessException hierarchy in Spring s data access module. In total, there are more than 30 exception classes defined for different categories of data access exceptions.

Spring is able to simplify EJB 2x access by applying a proxy-based approach In EJB 30, EJB access is simpler, but you can still leverage Spring s JNDI utilities to make it even simpler JMS defines a set of standard APIs for message-oriented communication in the Java EE platform With JMS, different applications can communicate in a loosely coupled way compared to other remoting technologies such as RMI However, when using the JMS API to send and receive messages, you have to manage the JMS resources yourself and handle the JMS API s exceptions, which results in many lines of JMS-specific code Spring simplifies JMS s usage with a template-based approach just as it does for JDBC Moreover, Spring enables beans declared in its IoC container to listen for JMS messages and react to them.

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Until now, you haven t handled JDBC exceptions explicitly when using a JDBC template or JDBC operation objects. To help you understand the Spring JDBC framework s exception-handling mechanism, let s consider the following code fragment in the Main class, which inserts a vehicle. What happens if you insert a vehicle with a duplicate vehicle number

Upon finishing this chapter, you will be able to create and access EJB components with Spring s support You will also know how to use Spring s JMS support to simplify sending, receiving, and listening for JMS messages..

package com.apress.springenterpriserecipes.vehicle; ... public class Main { public static void main(String[] args) { ... VehicleDao vehicleDao = (VehicleDao) context.getBean("vehicleDao"); Vehicle vehicle = new Vehicle("EX0001", "Green", 4, 4); vehicleDao.insert(vehicle); } } If you run the method twice, or the vehicle has already been inserted into the database, it will throw a DuplicateKeyException, a subclass of DataAccessException. In your DAO methods, you neither need to surround the code with a try/catch block nor declare throwing an exception in the method signature. This is because DataAccessException (and therefore its subclasses, including DuplicateKeyException) is an unchecked exception that you are not forced to catch. The direct parent class of DataAccessException is NestedRuntimeException, a core Spring exception class that wraps another exception in a RuntimeException. When you use the classes of the Spring JDBC framework, they will catch SQLException for you and wrap it with one of the subclasses of DataAccessException. As this exception is a RuntimeException, you are not required to catch it. But how does the Spring JDBC framework know which concrete exception in the DataAccessException hierarchy should be thrown It s by looking at the errorCode and SQLState properties of the caught SQLException. As a DataAccessException wraps the under-lying SQLException as the root cause, you can inspect the errorCode and SQLState properties with the following catch block: package com.apress.springenterpriserecipes.vehicle; ... import java.sql.SQLException; import org.springframework.dao.DataAccessException; public class Main { public static void main(String[] args) { ... VehicleDao vehicleDao = (VehicleDao) context.getBean("vehicleDao"); Vehicle vehicle = new Vehicle("EX0001", "Green", 4, 4); try { vehicleDao.insert(vehicle); } catch (DataAccessException e) { SQLException sqle = (SQLException) e.getCause(); System.out.println("Error code: " + sqle.getErrorCode()); System.out.println("SQL state: " + sqle.getSQLState()); } } }

These skills include the software development best practices that are discussed later in this book Sadly, these skills are rarely mentioned in job ads They re harder to assess: you can t just boil them down to a list of buzzwords and acronyms..

In EJB 2.x, each EJB component requires a remote/local interface, a remote/local home interface, and a bean implementation class, in which you must implement all EJB life cycle callback methods even if you don t need them. In that case, you have to provide an empty implementation for them.

Spring comes with a set of EJB support classes to simplify your implementation of different types of EJB. These classes provide empty implementation for all EJB life cycle callback methods. Your EJB classes can extend these classes to inherit the methods. Table 17-1 shows Spring s EJB support classes for different types of EJB. Table 17-1. Spring s EJB Support Classes for Different Types of EJB

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