经过磕磕绊绊的探索、看帖子、看博客。终于把问题解决了。我现在把我出现的问题及解决办法和大家分享一下。不过不一定适合所有人。
错误：提交表单时出现404错误。控制台提示的信息是：2012-5-5 21:27:24 com.opensymphony.xwork2.util.logging.jdk.JdkLogger warn
警告: Could not find action or result
No result defined for action tr.LoginAction and result error at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:376)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:278)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)...
struts.xml的配置：<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="test" extends="struts-default">
<action name="login" class="tr.LoginAction">
<result name="success">/success.jsp</result>
<result name="ERROR">/error.jsp</result>
</action>
</package>
</struts>
xx.java:public String execute() throws Exception {
if(getUsername().equals("tr") && getPassword().equals("tr")){
return Action.SUCCESS;
}else
return Action.ERROR;
}
解决办法：大家看到没，<result name="ERROR">/error.jsp</result>
这个"ERROR"是借口Action里的成员变量。如果把“ERROR”改成error就OK了！
错误：
在启动tomcat的时候，控制台输出：严重: Dispatcher initialization failed
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:295)
at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:431)
Caused by: java.lang.reflect.InvocationTargetException
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 com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:293)
... 42 more
Caused by: java.lang.ExceptionInInitializerError
at com.opensymphony.xwork2.ognl.OgnlValueStackFactory.setContainer(OgnlValueStackFactory.java:85)
... 47 more
Caused by: java.lang.IllegalArgumentException: Javassist library is missing in classpath! Please add missed dependency!
at ognl.OgnlRuntime.<clinit>(OgnlRuntime.java:168)
... 48 more
Caused by: java.lang.ClassNotFoundException: javassist.ClassPool
aused by: java.lang.ExceptionInInitializerError
at com.opensymphony.xwork2.ognl.OgnlValueStackFactory.setContainer(OgnlValueStackFactory.java:85)
... 47 more
Caused by: java.lang.IllegalArgumentException: Javassist library is missing in classpath! Please add missed dependency!
at ognl.OgnlRuntime.<clinit>(OgnlRuntime.java:168)
... 48 more
Caused by: java.lang.ClassNotFoundException: javassist.ClassPool
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at ognl.OgnlRuntime.<clinit>(OgnlRuntime.java:165)
... 48 more
2012-5-5 21:39:21 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2012-5-5 21:39:21 org.apache.catalina.core.StandardContext start
严重: Context [/struts2] startup failed due to previous errors
2012-5-5 21:39:21 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: The web application [/struts2] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@56fc16]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@c017e9]) but failed to remove it when the
web application was stopped. This is very likely to create a memory leak.
大家注意这条提示：Caused by: java.lang.ClassNotFoundException: javassist.ClassPool解决办法：在struts的app文件下的struts2-blank.war的压缩包里的WEB-INF/lib下有这个文件，将这个文件放在你的项目的lib下就行了
错误：[color=#FF0000]严重: Dispatcher initialization failed
Unable to load configuration. - action - file:/F:/apache-tomcat-6.0.29/webapps/error/WEB-INF/classes/struts.xml:5:42
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:374)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:418)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
Caused by: Error building results for action test in namespace - action - file:/F:/apache-tomcat-6.0.29/webapps/error/WEB-INF/classes/struts.xml:5:42
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:367)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:468)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:264)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:193)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
... 31 more[/color]
[color=#00FF00]struts.xml配置：<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="test" >
<action name="test" class="tr.test.Test">
<result name="hello">/index.jsp</result>
</action>
</package>
</struts> [/color]
解决办法：[package name="test" >
package没有扩展struts的默认包。改成
<package name="test" extends="struts-default">就OK了
另外附上我的web.xml配置：<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping></web-app>