Unable to instantiate Action, userBean, defined for 'userDemo' in namespace '/'userBean com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:318) com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:399) com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:198) org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61) 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:488) org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77) org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

大致意思就是无法实例化javaBean




new 就是实例化