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One of the main reasons to use SimpleUrlHandlerMapping is to take advantage of interceptors While you can configure interceptors with BeanNameUrlHandlerMapping, it is very difficult to create different combinations of handlers and interceptors Using SimpleUrlHandlerMapping makes it easy to create custom handler chains per request handler We will visit interceptors in 6 Custom Mapping Strategy The power and flexibility of Spring MVC s request mapping really shines when a non URL-based mapping strategy is required Because the HandlerMapping interface doesn t require a URL to be involved in the mapping, the possibilities are quite open To illustrate a mapping strategy not based on URLs, let s consider mapping requests to handlers based solely on request parameters To begin with, we will subclass AbstractHandlerMapping to take advantage of ordering, the ability to set a default handler, and other life cycle callbacks.

System.out.println( "Trying to find Entity with ID: "+id); return (TestEntity) PortableRemoteObject.narrow( home.findByPrimaryKey(id), TestEntity.class); } private TestEntityHome lookupHome() throws NamingException{ Context ctx = new InitialContext(); System.out.println("Looking up Home:"); TestEntityHome home = (TestEntityHome) ctx.lookup("testEntity"); home = (TestEntityHome) PortableRemoteObject.narrow(home, TestEntityHome.class); return home; } }

I did not use all of the colors or attributes defined in the function, but I included them for the sake of completeness. This function would be an excellent addition to a standard library, which is discussed in 2. Now that the colors are defined, the script clears the display and then obtains the name of the machine from the /proc/hostname file. Then it displays a header for the report.

The new RequestParameterHandlerMapping class (Listing 5-16) will map request parameter values from a specified parameter name to handler instances Listing 5-16 RequestParameterHandlerMapping public class RequestParameterHandlerMapping extends AbstractHandlerMapping implements InitializingBean { public final static String DEFAULT_PARAM_NAME = "handler"; private String parameterName = DEFAULT_PARAM_NAME; private final Map<String, Object> paramMappings = new HashMap<String, Object>();.

Notice that the test method testCreateEntity() does not use an assert() method to evaluate any test conditions. However, it does catch and throw an exception if something goes wrong while trying to create an instance of the test entity bean. If an exception is thrown from a test method, Cactus will recognize the test as a failure. You can use this Cactus feature to test business logic that is evaluated without the basis of return values. Business methods that throw exceptions as a method of validation and a way to indicate errors can be quickly tested using methods that pass along the exceptions to the Cactus framework.

public final void setParamMappings(Map<String, Object> paramMappings) { this.paramMappings.putAll(paramMappings); } public final void setParameterName(String parameterName) { this.parameterName = parameterName; } @Override protected Object getHandlerInternal(HttpServletRequest request) throws Exception { String parameterValue = request.getParameter(parameterName); return paramMappings.get(parameterValue); } public void afterPropertiesSet() throws Exception { Assert.hasText(parameterName, "parameterName must not be null or blank"); } } Because this class extends AbstractHandlerMapping, if no handler exists for the request parameter, then the AbstractHandlerMapping will attempt to load the default handler, which can be set via the XML bean definition. See Listing 5-17. Listing 5-17. RequestParameterHandlerMapping XML Definition <bean class="com.apress.expertspringmvc.chap5.RequestParameterHandlerMapping"> <property name="defaultHandler" ref="defaultController" /> <property name="parameterName" value="action" /> <property name="paramMappings"> <map> <entry key="load" value-ref="loadController" /> <entry key="save" value-ref="saveController" /> </map> </property> </bean> With this configuration, the URL http://example.org/springapp/app action=load would be routed to the loadController. Remember that /app is just the DispatcherServlet mapping and not specific to any controller or request handler.

clear hostname=`cat /proc/sys/kernel/hostname` echo echo -e "System Report for $white$hostname$normal on `date`" echo

9.4 Creating a stateless session bean unit test 9.5 Creating a stateful session bean unit test 9.7 Automating test case execution 9.8 Executing test cases using a UI

Sometimes looking at raw code is the only way to make the light bulb go off. If you re stuck and want to see how others might do it, Spring comes with many sample applications with full source code. These are excellent opportunities to investigate real working apps to see examples of Spring MVC and its integration with the rest of the application. The sample applications can be found in the samples directory of the Spring Framework distribution or CVS repository. Table 1-1. Sample Web Applications

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