Error on line 87, column 9 in template/simple/doubleselect.ftl stack.findString(parameters.listValue

素颜马尾好姑娘i 2022-05-08 08:52 76阅读 0赞

十月 10, 2018 3:11:58 下午 org.apache.catalina.core.ApplicationDispatcher invoke  
严重: Servlet.service() for servlet jsp threw exception

Error on line 87, column 9 in template/simple/doubleselect.ftl  
stack.findString(parameters.listValue) is undefined.  
It cannot be assigned to itemValue  
The problematic instruction:  
\----------  
==> assignment: itemValue=stack.findString(parameters.listValue) \[on line 87, column 9 in template/simple/doubleselect.ftl\]  
in user-directive s.iterator \[on line 80, column 1 in template/simple/doubleselect.ftl\]  
\----------

Java backtrace for programmers:  
\----------  
freemarker.core.InvalidReferenceException: Error on line 87, column 9 in template/simple/doubleselect.ftl  
stack.findString(parameters.listValue) is undefined.  
It cannot be assigned to itemValue  
at freemarker.core.Assignment.accept(Assignment.java:111)  
at freemarker.core.Environment.visit(Environment.java:210)  
at freemarker.core.IfBlock.accept(IfBlock.java:82)  
at freemarker.core.Environment.visit(Environment.java:210)  
at freemarker.core.MixedContent.accept(MixedContent.java:92)  
at freemarker.core.Environment.visit(Environment.java:210)  
at freemarker.core.Environment.visit(Environment.java:299)  
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)  
at freemarker.core.Environment.visit(Environment.java:210)  
at freemarker.core.MixedContent.accept(MixedContent.java:92)  
at freemarker.core.Environment.visit(Environment.java:210)  
at freemarker.core.Environment.process(Environment.java:190)  
at freemarker.template.Template.process(Template.java:237)  
at org.apache.struts2.components.template.FreemarkerTemplateEngine.renderTemplate(FreemarkerTemplateEngine.java:157)  
at org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:559)  
at org.apache.struts2.components.UIBean.end(UIBean.java:513)  
at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)  
at org.apache.jsp.WEB\_002dINF.JSP.Questions.Questions\_jsp.\_jspx\_meth\_s\_005fdoubleselect\_005f0(Questions\_jsp.java:648)  
at org.apache.jsp.WEB\_002dINF.JSP.Questions.Questions\_jsp.\_jspService(Questions\_jsp.java:240)  
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)  
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)  
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)  
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)  
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)  
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:747)  
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:485)  
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:410)  
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:337)  
at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:157)  
at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)  
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:373)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:277)  
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)  
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)  
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)  
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)  
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)  
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
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:248)  
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at com.minimaxhk.util.LoginedCheckInterceptor.intercept(LoginedCheckInterceptor.j  
ava:59)  
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)  
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)  
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)  
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)  
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)  
at com.minimaxhk.util.AuthorityFilter.doFilter(AuthorityFilter.java:31)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)  
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)  
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)  
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)  
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)  
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)  
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)  
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)  
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)  
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)  
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)  
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)  
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)  
at java.lang.Thread.run(Thread.java:744)

十月 10, 2018 3:11:58 下午 org.apache.catalina.core.StandardWrapperValve invoke  
严重: Servlet.service() for servlet \[default\] in context with path \[/minimaxExam\] threw exception  
java.lang.IllegalStateException: Cannot call sendError() after the response has been committed  
at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:450)  
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:819)  
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:519)  
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)  
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)  
at com.minimaxhk.util.AuthorityFilter.doFilter(AuthorityFilter.java:31)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)  
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)  
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)  
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)  
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)  
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)  
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)  
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)  
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)  
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)  
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)  
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)  
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)  
at java.lang.Thread.run(Thread.java:744)

![70][]

出现问题的原因可能不止一个。此例的 bug 在于使用了 struts select 标签解析字符串数组，而数组内有空值的元素，因此报此异常。解决的办法就是去除数组内空值的元素，即可。

这个问题我看网上说的是数组中存在空，看了一眼我的报错页面select中果然有空，把空的值删了就解决了。

[70]: /images/20220508/dba5f75d173f469e9a32be0324721033.png