Question

我们使用struts1-plugin将旧的Struts 1应用程序迁移到Struts 2来包装我们的操作。
这在某些操作中效果很好，但其他操作会抛出如下所示的错误：

java.lang.InstantiationException 
sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
java.lang.Class.newInstance(Class.java:374)
com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:158)
com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:189)
com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:178)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.resolveModel(ScopedModelDrivenInterceptor.java:106)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:136)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
de.dak.intranet.webtier.extranet.StartPageFilter.doFilter(StartPageFilter.java:74)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
de.dak.intranet.webtier.auth.LoginFilter.doFilter(LoginFilter.java:288)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:745)

此操作的配置非常简单：

<package name="extranet" extends="struts1-default" namespace="/extranet">
  <action name="acceptConditions" class="org.apache.struts2.s1.Struts1Action>
    <param name="className">de.intranet.webtier.extranet.AcceptConditionsAction</param>
    <interceptor-ref name="struts1Stack"/>
    <result name="success">/servlet/index.jsp</result>
  </action>
</package>

我尝试在动作中移除拦截器但是没有改变任何东西。动作类看起来像这样（省略了实际逻辑）：

public class AcceptConditionsAction extends Action {
  public ActionForward execute(ActionMapping mapping, 
                               ActionForm form, 
                               HttpServletRequest request, 
                               HttpServletResponse response) 
        throws Exception {
    return mapping.findForward("success");
  }
}

我们的jsp模板中的链接使用s：action-tag正确构建，并且在单击链接时，同一站点上的另一个操作可以正常工作。但是，此操作会生成上面显示的堆栈跟踪，但我无法确定它来自何处或如何修复它。从未到达动作内部的断点，因此在实例化动作本身时必须发生错误。

我希望有人可以帮我弄清楚发生了什么。

编辑：澄清的工作行动：

<package name="extranet" extends="struts1-default" namespace="/extranet">
  <interceptors>
    <interceptor name="pwdForm" class="com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor>
      <param name="className">de.intranet.webtier.extranet.PasswordForm</param>
      <param name="name">pwdForm</param>
    </interceptor>
  </interceptors>
  <action name="editPassword" class="org.apache.struts2.s1.Struts1Action">
    <param name="className">de.intranet.webtier.extranet.EditPasswordAction</param>
    <interceptor-ref name="pwdForm"/>
    <interceptor-ref name="struts1Stack"/>
    <result name="changePassword">/extranet/changePassword.jsp</result>
  </action>
</package>

Java实现看起来像AcceptConditionsAction。只覆盖了执行方法，没有定义构造函数。

Answer 1

亚历山大指出了答案： struts1-plugin（称为struts1Stack）提供的拦截器堆栈创建了几个需要表单的拦截器（即scopedModelDriven，modelDriven和其他一些拦截器。如果您不使用整个堆栈并且只添加操作所需的拦截器，则不再需要定义FormBean。

Answer 2

删除interceptor-ref＆＃34; strutsStack＆＃34;，添加＆＃34; staticParams＆＃34;会做的。如下所示

<package name="extranet" extends="struts1-default" namespace="/extranet">
  <action name="acceptConditions" class="org.apache.struts2.s1.Struts1Action>
    <param name="className">de.intranet.webtier.extranet.AcceptConditionsAction</param>
    <!--interceptor-ref name="struts1Stack"/-->
    <interceptor-ref name="staticParams"/>
    <result name="success">/servlet/index.jsp</result>
  </action>
</package>

使用struts1-plugin调用操作时的InstantiationException

2 个答案: