Struts has detected an unhandled exception:
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Stacktraces
There is no Action mapped for namespace [/] and action name [user!add] associated with context path [/struts_practice_01]. - [unknown location]
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185) org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63) org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39) com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58) org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:553) org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77) org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:857) org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:565) org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509) java.lang.Thread.run(Thread.java:619)
解决方法：有时候动态调用方法怎么都不行 需要在strusts.xml加上一句话
<constant name="struts.enable.DynamicMethodInvocation" value="true" />