Struts Problem Report
Struts has detectedan unhandled exception:
Messages:
FreeMarker template error!
Methodpublic java.lang.Stringorg.apache.commons.lang.exception.NestableRuntimeException.getMessage(int)threw an exception when invoked on net.sf.json.JSONException:java.lang.reflect.InvocationTargetExceptionThe problematic instruction:———-==> ${msgs[0][0]} [on line 76, column 25 inorg/apache/struts2/dispatcher/error.ftl]———-
Javabacktrace forprogrammers:———-freemarker.template.TemplateModelException: Method public java.lang.Stringorg.apache.commons.lang.exception.NestableRuntimeException.getMessage(int)threw an exception when invoked on net.sf.json.JSONException:java.lang.reflect.InvocationTargetExceptionatfreemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)at freemarker.ext.beans.SimpleMethodModel.get(SimpleMethodModel.java:138)atfreemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:111)at freemarker.core.DynamicKeyName._getAsTemplateModel(DynamicKeyName.java:90)atfreemarker.core.Expression.getAsTemplateModel(Expression.java:89)at freemarker.core.Expression.getStringValue(Expression.java:93)atfreemarker.core.DollarVariable.accept(DollarVariable.java:76)at freemarker.core.Environment.visit(Environment.java:209)atfreemarker.core.MixedContent.accept(MixedContent.java:92)atfreemarker.core.Environment.visit(Environment.java:209)atfreemarker.core.IfBlock.accept(IfBlock.java:82)atfreemarker.core.Environment.visit(Environment.java:209)atfreemarker.core.IfBlock.accept(IfBlock.java:82)atfreemarker.core.Environment.visit(Environment.java:209)at freemarker.core.MixedContent.accept(MixedContent.java:92)atfreemarker.core.Environment.visit(Environment.java:209)atfreemarker.core.Environment.process(Environment.java:189)atfreemarker.template.Template.process(Template.java:237)atorg.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:748)atorg.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:505)atorg.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)atorg.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)atorg.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)atorg.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)atjava.lang.Thread.run(Thread.java:662)Caused by: java.lang.NullPointerExceptionatfreemarker.ext.beans.SimpleMemberModel.unwrapArguments(SimpleMemberModel.java:85)atfreemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)… 37 more
一大串真心的看不懂啊，不过找到关键字一搜就可以明白错误在哪儿呢。但是我却查找了半天。。。
解决方案：
JSONArray arvert = JSONArray.fromObject(实体集合);json =arvert.toString();人只要不失去方向，就不会失去自己
