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[Java教程]Struts2:java.lang.NoSuchFieldException: resourceEntries at java.lang.Class.getDeclaredField(Class.java:1901)


  今天在做Struts2的测试用例时候,程序能正常跳转,但是在Console却报了一个错误,如下:

 1 java.lang.NoSuchFieldException: resourceEntries 2   at java.lang.Class.getDeclaredField(Class.java:1901) 3   at com.opensymphony.xwork2.util.LocalizedTextUtil.clearMap(LocalizedTextUtil.java:877) 4   at com.opensymphony.xwork2.util.LocalizedTextUtil.clearTomcatCache(LocalizedTextUtil.java:857) 5   at com.opensymphony.xwork2.util.LocalizedTextUtil.reloadBundles(LocalizedTextUtil.java:841) 6   at com.opensymphony.xwork2.util.LocalizedTextUtil.getMessage(LocalizedTextUtil.java:723) 7   at com.opensymphony.xwork2.util.LocalizedTextUtil.findMessage(LocalizedTextUtil.java:781) 8   at com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:447) 9   at com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:374) 10   at com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:202) 11   at com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:117) 12   at com.opensymphony.xwork2.ActionSupport.getText(ActionSupport.java:100) 13   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 14   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 15   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 16   at java.lang.reflect.Method.invoke(Method.java:601) 17   at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:871) 18   at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1273) 19   at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68) 20   at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117) 21   at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:101) 22   at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1349) 23   at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1325) 24   at com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor.callMethod(CompoundRootAccessor.java:232) 25   at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1349) 26   at ognl.ASTMethod.getValueBody(ASTMethod.java:90) 27   at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) 28   at ognl.SimpleNode.getValue(SimpleNode.java:258) 29   at ognl.Ognl.getValue(Ognl.java:494) 30   at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:217) 31   at com.opensymphony.xwork2.ognl.OgnlValueStack.getValue(OgnlValueStack.java:342) 32   at com.opensymphony.xwork2.ognl.OgnlValueStack.tryFindValue(OgnlValueStack.java:331) 33   at com.opensymphony.xwork2.ognl.OgnlValueStack.tryFindValueWhenExpressionIsNotNull(OgnlValueStack.java:307) 34   at com.opensymphony.xwork2.ognl.OgnlValueStack.findValue(OgnlValueStack.java:293) 35   at org.apache.struts2.components.Property.start(Property.java:162) 36   at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:53) 37   at org.apache.jsp.welcome_jsp._jspx_meth_s_005fproperty_005f0(welcome_jsp.java:227) 38   at org.apache.jsp.welcome_jsp._jspService(welcome_jsp.java:129) 39   at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 40   at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 41   at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438) 42   at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396) 43   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) 44   at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 45   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) 46   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 47   at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 48   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 49   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 50   at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721) 51   at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466) 52   at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391) 53   at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318) 54   at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:159) 55   at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186) 56   at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:373) 57   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:277) 58   at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176) 59   at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 60   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 61   at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263) 62   at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) 63   at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 64   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 65   at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133) 66   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 67   at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) 68   at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 69   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 70   at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) 71   at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 72   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 73   at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190) 74   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 75   at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) 76   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 77   at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94) 78   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 79   at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243) 80   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 81   at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) 82   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 83   at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) 84   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 85   at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) 86   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 87   at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142) 88   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 89   at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166) 90   at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 91   at com.opensymphony.xwork2.DefaultActionInvocation.invok 92 e(DefaultActionInvocation.java:248) 93   at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176) 94   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 95   at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) 96   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 97   at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190) 98   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 99   at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)100   at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)101   at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)102   at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)103   at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)104   at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)105   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)106   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)107   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)108   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)109   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)110   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)111   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)112   at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)113   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)114   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)115   at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)116   at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)117   at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2503)118   at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2492)119   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)120   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)121   at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)122   at java.lang.Thread.run(Thread.java:722)

  刚开始,百思不得其解,因为在我的form中没有用到resourceEntries,于是根据代码查看struts2源码,在struts2源码中找到了resourceEntries。

 1 private static void clearTomcatCache() 2  { 3   ClassLoader loader = getCurrentThreadContextClassLoader(); 4  5   Class cl = loader.getClass(); 6   try 7   { 8    if ("org.apache.catalina.loader.WebappClassLoader".equals(cl.getName())) { 9     clearMap(cl, loader, "resourceEntries");10    }11    else if (LOG.isDebugEnabled())12     LOG.debug("class loader " + cl.getName() + " is not tomcat loader.", new String[0]);13   }14   catch (NoSuchFieldException nsfe)15   {16    if ("org.apache.catalina.loader.WebappClassLoaderBase".equals(cl.getSuperclass().getName())) {17     if (LOG.isDebugEnabled())18      LOG.debug("Base class #0 doesn't contain '#1' field, trying with parent!", nsfe, new String[] { cl.getName(), "resourceEntries" });19     try20     {21      clearMap(cl.getSuperclass(), loader, "resourceEntries");22     } catch (Exception e) {23      if (LOG.isWarnEnabled())24       LOG.warn("Couldn't clear tomcat cache using #0", e, new String[] { cl.getSuperclass().getName() });25     }26    }27   }28   catch (Exception e) {29    if (LOG.isWarnEnabled())30     LOG.warn("Couldn't clear tomcat cache", e, new String[] { cl.getName() });31   }32  }

  看到org.apache.catalina.loader.WebappClassLoaderBase好像是tomcat中的问题,于是查看网上资料,发现tomcat8.0的类加载器webappclsaaLoader中没有属性resourceEntries,于是我换了tomcat7.0的看了下,7.0的有属性resourceEntries。看来这个是tomcat版本的问题了。如果需要用tomcat8,这就必须修改struts2的这个bug,再重新编译,这也是开源的一个好处。