struts2 排错
以前项目用过webwork2,感觉这两个差不多，今天用struts2开发一个helloworld程序没想到出了很多错，看来自己真实眼高手低呀。
首先是：
最后在网上查到，有人建议移除$TOMCAT_HOME/common/endorsed/下的Jar包，说是很JDK的有冲突,后来，果然可以了。得感谢这些前辈们。
接着程序到时候能运行了，但日志里面出了很多错。
后来看了看，应该是缺少freemarker的Jar文件，放进去，果然可以了，看来以后还的多学习学习。
以后在也不能想当然了，但为什么struts2不像spring那样，不用freemarker做视图，为什么还得需要那些Jar文件呢，请高人指点？
首先是：
严重: Exception starting filter struts javax.xml.transform.TransformerFactoryConfigurationError: Provider org.apache.xalan.processor.TransformerFactoryImpl could not be instantiated: java.lang.NullPointerException at javax.xml.transform.TransformerFactory.newInstance(Unknown Source) at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<clinit>(DomHelper.java:167) at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:115) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:830) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:131) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:100) at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:130) at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52) at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395) at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452) at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:201) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3635) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4222) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014) at org.apache.catalina.core.StandardHost.start(StandardHost.java:736) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:448) at org.apache.catalina.core.StandardServer.start(StandardServer.java:700) at org.apache.catalina.startup.Catalina.start(Catalina.java:552) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433) 2009-3-11 11:23:38 org.apache.catalina.core.StandardContext start
最后在网上查到，有人建议移除$TOMCAT_HOME/common/endorsed/下的Jar包，说是很JDK的有冲突,后来，果然可以了。得感谢这些前辈们。
接着程序到时候能运行了，但日志里面出了很多错。
Caught Exception while registering Interceptor class org.apache.struts2.interceptor.debugging.DebuggingInterceptor - interceptor - jar:file:/E:/DevelopWorkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp2/wtpwebapps/struts2/WEB-INF/lib/struts2-core-2.0.11.jar!/struts-default.xml:98:115 at org.apache.struts2.impl.StrutsObjectFactory.buildInterceptor(StrutsObjectFactory.java:78) at com.opensymphony.xwork2.config.providers.InterceptorBuilder.constructInterceptorReference(InterceptorBuilder.java:57) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.lookupInterceptorReference(XmlConfigurationProvider.java:905) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptorStack(XmlConfigurationProvider.java:743) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptorStacks(XmlConfigurationProvider.java:756) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptors(XmlConfigurationProvider.java:777) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:410) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:239) at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111) at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:152) at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52) at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395) at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452) at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:201) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3635) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4222) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014) at org.apache.catalina.core.StandardHost.start(StandardHost.java:736) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:448) at org.apache.catalina.core.StandardServer.start(StandardServer.java:700) at org.apache.catalina.startup.Catalina.start(Catalina.java:552) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433) Caused by: com.opensymphony.xwork2.inject.DependencyException: com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=org.apache.struts2.views.freemarker.FreemarkerManager, name='default'] in public void org.apache.struts2.interceptor.debugging.DebuggingInterceptor.setFreemarkerManager(org.apache.struts2.views.freemarker.FreemarkerManager). at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMembers(ContainerImpl.java:157) at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMethods(ContainerImpl.java:126) at com.opensymphony.xwork2.inject.ContainerImpl.addInjectors(ContainerImpl.java:103) at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:84) at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:82) at com.opensymphony.xwork2.inject.util.ReferenceCache$CallableCreate.call(ReferenceCache.java:155) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at com.opensymphony.xwork2.inject.util.ReferenceCache.internalCreate(ReferenceCache.java:81) at com.opensymphony.xwork2.inject.util.ReferenceCache.get(ReferenceCache.java:121) at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:452) at com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:492) at com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:491) at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:542) at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:490) at com.opensymphony.xwork2.ObjectFactory.injectInternalBeans(ObjectFactory.java:131) at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:156) at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:143) at org.apache.struts2.impl.StrutsObjectFactory.buildInterceptor(StrutsObjectFactory.java:53) ... 31 more Caused by: com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=org.apache.struts2.views.freemarker.FreemarkerManager, name='default'] in public void org.apache.struts2.interceptor.debugging.DebuggingInterceptor.setFreemarkerManager(org.apache.struts2.views.freemarker.FreemarkerManager). at com.opensymphony.xwork2.inject.ContainerImpl.createParameterInjector(ContainerImpl.java:239) at com.opensymphony.xwork2.inject.ContainerImpl.getParametersInjectors(ContainerImpl.java:229) at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.<init>(ContainerImpl.java:282) at com.opensymphony.xwork2.inject.ContainerImpl$3.create(ContainerImpl.java:130) at com.opensymphony.xwork2.inject.ContainerImpl$3.create(ContainerImpl.java:128) at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMembers(ContainerImpl.java:154) ... 49 more
后来看了看，应该是缺少freemarker的Jar文件，放进去，果然可以了，看来以后还的多学习学习。
以后在也不能想当然了，但为什么struts2不像spring那样，不用freemarker做视图，为什么还得需要那些Jar文件呢，请高人指点？