使用动态表单返回空指针异常

Question

这是我config文件的配置,  手动配置一个userForm类<form-beans >  <form-bean name="userForm" type="org.apache.strusts.action.DynaActionForm">  <!-- 该表单的属性是手工配置的 -->  <form-property name="username" type="java.lang.String"/>  <form-property name="password" type="java.lang.String"/>  <form-property name="email" type="java.lang.String"/>  </form-bean>  </form-beans> <action-mappings >    <action      attribute="userForm"      input="/WEB-INF/register.jsp"      name="userForm"      parameter="flag"      path="/register"      scope="request"      type="com.yourcompany.struts.action.RegisterAction"      cancellable="true" >      <forward name="success" path="/WEB-INF/denglu.jsp" />    </action>  </action-mappings>在action的register函数里面执行却报空指针异常public ActionForward register(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { //DynaActionForm userForm = (DynaActionForm) form;// TODO Auto-generated method stub System.out.println("=========="); return mapping.findForward("success"); }求大神解答

Answer 1

你好：你看下mapping传进来是不是空的，打断点试试看。