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Mapping incoming requests to request handlers is very flexible in Spring MVC. Out of the box, URL mapping methods are provided, but it s very easy to create mapping strategies that use any information available in the HttpServletRequest. The BeanNameUrlHandlerMapping is the default mapping strategy and is used if no other mapping strategies are defined in the ApplicationContext. This strategy, while simple and easy, does have a few limitations. If you require complex interceptor mapping or the use of prototype beans for handlers, you will need to use the SimpleUrlHandlerMapping. Handler mapping strategies can be ordered using the Ordered interface, allowing you to utilize multiple methods to resolve incoming requests to handlers.

set `grep MemTotal /proc/meminfo` tot_mem=$2 ; tot_mem_unit=$3 set `grep MemFree /proc/meminfo` free_mem=$2 ; fre_mem_unit=$3 perc_mem_used=$((100-(100*free_mem/tot_mem))) set `grep SwapTotal /proc/meminfo` tot_swap=$2 ; tot_swap_unit=$3 set `grep SwapFree /proc/meminfo` free_swap=$2 ; fre_swap_unit=$3 perc_swap_used=$((100-(100*free_swap/tot_swap)))

<target name="runCactusTest"> <junit printsummary="yes" haltonfailure="yes" haltonerror="yes" fork="yes"> <classpath> <pathelement location="${PROJECT_LOCATION}/build/tests"/> <pathelement location="${PROJECT_LOCATION}/build/ejbs"/> <pathelement location="C:/cactus/lib/cactus-1.4.1.jar"/> <pathelement location="C:/j2sdkee1.4/lib/j2ee.jar"/> <pathelement location="C:/jakarta-ant-1.5-cactus/lib/aspectjrt-1.0.5.jar"/> <pathelement location="C:/jakarta-ant-1.5-cactus/lib/commons-collection-2.0.jar"/> <pathelement location="C:/cactus/lib/commons-httpclient-2.0alpha1-20020606.jar" /> <pathelement location="." /> </classpath> <formatter type="plain" usefile="false"/> <test name="${PROJECT_NAME}.TestStateless"/> </junit> </target>

When an exception occurs from handling a request, Spring MVC can catch the exception for you and route the request to a particular error page or other exception handling code. The HandlerExceptionResolver will handle any exception thrown inside the HandlerInterceptors, the Controllers, or the View rendering. Typically, an exception is mapped to a particular error page, but it is easy to extend this functionality for your particular error handling needs. By using a HandlerExceptionResolver, shown in Listing 5-18, it is easy to centralize error handling and configuration. Otherwise, each controller and interceptor would have to contain duplicate code and logic for each exception that could be thrown. Listing 5-18. HandlerExceptionResolver Interface package org.springframework.web.servlet; public interface HandlerExceptionResolver { ModelAndView resolveException( HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex); } The DispatcherServlet is configured by default to look for all beans in its ApplicationContext of type HandlerExceptionResolver. If it finds one or more, it will order them using the org.springframework.core.Ordered interface if the bean implements it. If no HandlerExceptionResolver is found, no exception resolving will take place. Of course, any mapped exceptions you have specified in the web.xml will still apply if the exception isn t handled by a HandlerExceptionResolver. You may also tell the DispatcherServlet to use only a single exception resolver, ignoring all others that may be present in the ApplicationContext. Simply set the detectAllHandlerExceptionResolvers property of the DispatcherServlet to false, and then define a single bean with the name handlerExceptionResolver.

Once the script has calculated percentages, the color of the output is set depending on the usage value that is being reported. Messages reporting usage levels of less than 80 percent appear in green, values between 80 and 90 percent appear in yellow, and 90 percent utilization or greater values appear in red. I have chosen the percentages somewhat arbitrarily. One improvement to the script would be to replace the percentage values with variables that are initialized using either a command-line switch or a configuration file.

A test is executed for each <test> element present in the target. Each <test> target specifies a classname of a test case in which to invoke. The following target is for starting the server; this is the target that was specified in the startTarget parameter of the Cactus task. This target definition has been taken exactly from the Cactus distribution. The distribution contains target definitions for most of the popular application servers available today. This one is for the Weblogic application server:

The default implementation of this interface is the org.springframework.web.servlet. handler.SimpleMappingExceptionResolver. This class maps exceptions to view names by the exception class name or a substring of the class name. This implementation can be configured for individual Controllers or for globally for all handlers. The example configuration in Listing 5-19 illustrates these options. Listing 5-19. Example SimpleMappingExceptionResolver ApplicationContext < xml version="1.0" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="exceptionMapping" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <property name="exceptionMappings"> <props> <prop key="ApplicationException">appErrorView</prop> <prop key="SomeOtherException">someErrorView</prop> <prop key="java.lang.Exception">genericErrorView</prop> </props> </property> </bean> </beans> The exceptionMappings property is a java.util.Properties with substrings (explained later in this section) of exception class names as keys and View names as values. Notice how you can specify a fully qualified class name or only part of a class name for the key. The error View name will be ultimately resolved by a ViewResolver. Listing 5-19 does not specify a particular request handler, so it will be applied to any mapped exception by any handler. However, you can bind an exception resolver to specific handlers to create very specific mappings. Use this technique when you require displaying different error pages for the same exception thrown by two different controllers.

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