java.lang.ClassCastException во время цепочки действий - от Struts 1 до Struts 2

Question

У нас есть приложение Struts 1. Нам нужно перейти на Struts 2. С незначительными изменениями. Мы ничего не будем менять в классе Action. Мы используем существующий класс действий и Action Form. Действие запускается без каких-либо проблем. Но цепь действия работает не так, как ожидалось. Мы используем множество значений от LoginAction до FetchInboxAction. Оба используют две разные формы. Пожалуйста, найдите образец struts.xml и стек ошибок. Цепочное действие для нас не работает.

В настоящее время мы получаем ошибку ниже:

225760 [http-nio-8080-exec-8] ERROR org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler - Exception occurred during processing request: com.InboxForm cannot be cast to com.LoginForm 
java.lang.ClassCastException: com.InboxForm cannot be cast to com.LoginForm 
at com.LoginAction.execute(LoginAction.java:104) 
at org.apache.struts2.s1.Struts1Action.execute(Struts1Action.java:99) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:497) 
at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:891) 
at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293) 
at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68) 
at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117) 
at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108) 
at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369) 
at ognl.ASTMethod.getValueBody(ASTMethod.java:90) 
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) 
at ognl.SimpleNode.getValue(SimpleNode.java:258) 
at ognl.Ognl.getValue(Ognl.java:494) 
at ognl.Ognl.getValue(Ognl.java:458) 
at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309) 
at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340) 
at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307) 
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423) 
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250) 
at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) 
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) 
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) 
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) 
at com.opensymphony.xwork2.ActionChainResult.execute(ActionChainResult.java:233) 
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:369) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:273) 
at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) 
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) 
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) 
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) 
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244) 
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) 
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564) 
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81) 
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at com.SecurityAccessFilter.doFilter(SecurityAccessFilter.java:105) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) 
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
at java.lang.Thread.run(Thread.java:745) 

struts.xml:

<!DOCTYPE struts PUBLIC 
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 
"http://struts.apache.org/dtds/struts-2.0.dtd"> 
<struts> 


<package name="PackageName" namespace="/" 
           extends="struts1-default"> 
<interceptors> 
    <interceptor name="LoginForm" 
    class="com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor"> 
    <param name="className">com.LoginForm</param> 
    <param name="name">LoginForm</param> 
    <param name="scope">request</param> 
    </interceptor> 


    <interceptor name="InboxForm" 
    class="com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor"> 
    <param name="className">com.InboxForm</param> 
    <param name="name">InboxForm</param> 
    <param name="scope">request</param> 
    </interceptor> 


    <interceptor-stack name="web"> 
    <interceptor-ref name="staticParams"/> 
    <interceptor-ref name="LoginForm"/> 
    <interceptor-ref name="modelDriven"/> 
    <interceptor-ref name="basicStack"/> 
    </interceptor-stack>  


    <interceptor-stack name="web2"> 
    <interceptor-ref name="staticParams"/> 
    <interceptor-ref name="InboxForm"/> 
    <interceptor-ref name="modelDriven"/> 
    <interceptor-ref name="basicStack"/> 
    </interceptor-stack> 

</interceptors> 


<action name="LoginAction" class="org.apache.struts2.s1.Struts1Action" method="execute" > 
<param name="className">com.LoginAction</param> 
    <interceptor-ref name="web"/>  
    <result name="success" type="chain">FetchInboxAction</result> 
    <result name="failure">/error.jsp</result> 
</action> 

    <action name="FetchInboxAction" class="org.apache.struts2.s1.Struts1Action" method="execute"> 
<param name="className">com.FetchInboxAction</param> 
    <interceptor-ref name="web2"/> 
    <result name="success">/sucess.jsp</result> 
    <result name="failure">/error.jsp</result> 
    </action> 


    </package> 
</struts> 

Answer 1

В struts.xml для fetchInboxAction все перехватчики вызывается снова из-за этого после выполнения LoginAction вместо вызова FetchInboxAction он вызывает LoginAction с InboxForm. В классе действия Форма действия набирается на LoginForm, но во время выполнения мы получили FetchInboxForm. Это связано с неправильной конфигурацией.

После нижеследующих изменений Действие подбородка работает без каких-либо проблем.

Модифицированный Struts.xml

<!DOCTYPE struts PUBLIC 
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 
"http://struts.apache.org/dtds/struts-2.0.dtd"> 
<struts> 


<package name="PackageName" namespace="/" 
           extends="struts1-default"> 
<interceptors> 
    <interceptor name="LoginForm" 
    class="com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor"> 
    <param name="className">com.LoginForm</param> 
    <param name="name">LoginForm</param> 
    <param name="scope">request</param> 
    </interceptor> 


    <interceptor name="InboxForm" 
    class="com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor"> 
    <param name="className">com.InboxForm</param> 
    <param name="name">InboxForm</param> 
    <param name="scope">request</param> 
    </interceptor> 


    <interceptor-stack name="web"> 
    <interceptor-ref name="staticParams"/> 
    <interceptor-ref name="LoginForm"/> 
    <interceptor-ref name="modelDriven"/> 
    <interceptor-ref name="basicStack"/> 
    </interceptor-stack>  


    <interceptor-stack name="web2"> 
    <interceptor-ref name="staticParams"/> 
    <interceptor-ref name="InboxForm"/> 
    <interceptor-ref name="modelDriven"/> 
    <interceptor-ref name="basicStack"/> 
    </interceptor-stack> 

</interceptors> 


<action name="LoginAction" class="org.apache.struts2.s1.Struts1Action" method="execute" > 
<param name="className">com.LoginAction</param> 
    <interceptor-ref name="web"/>  
    <result name="success" type="chain">FetchInboxAction</result> 
    <result name="failure">/error.jsp</result> 
</action> 

    <action name="FetchInboxAction" class="org.apache.struts2.s1.Struts1Action" method="execute"> 
<param name="className">com.FetchInboxAction</param> 
    <interceptor-ref name="InboxForm"/> 
    <result name="success">/sucess.jsp</result> 
    <result name="failure">/error.jsp</result> 
    </action> 


    </package> 
</struts>