struts2.1.8 jquery 奇怪错误
一直运行正常的程序，突然之间报了以下的错误。 使用jquery ajax获取List数据，得不到json的数据。谁能给点提示啊！可是调试的时候明明看到 resultJson是有值的
java代码
package com.iss.action;import java.util.List;import org.apache.struts2.json.JSONException;import org.apache.struts2.json.JSONUtil;import com.iss.common.Constant;import com.iss.model.User;import com.iss.service.interfaces.UserService;/** * The Class UserAction. */public class UserAction extends BaseAction {/** The Constant serialVersionUID. */private static final long serialVersionUID = 1L;/** The new password. */private String newPassword ="";/** The old password. */private String oldPassword ="";/** The user. */private User user;private List<User> users;/** The user service. */private UserService userService; private JSONObject resultJson;void gengerateJsonString(List list, int count) {Map<String, Object> jsonMap = new HashMap<String, Object>(); jsonMap.put("total", count); jsonMap.put("rows", list); resultJson = JSONObject.fromObject(jsonMap);}public void setResultJson(JSONObject resultJson) {this.resultJson = resultJson;}public JSONObject getResultJson() {return resultJson;}/** * */public UserAction() {super();setModuleName(Constant.ModuleName.Person);}public String applyRegister(){user = new User();user.setUserId(0);return SUCCESS;}public String checkDuplicateLoginName(){User u = userService.find(user.getLoginName());if(u != null){return TRUE;}else{return FALSE;}}public String deleteUsers(){userService.deleteUsers(this.objectIds);return SUCCESS;}public String findAll(){int count = userService.getCount();users = userService.getNextPage(this.getPage(), this.getRows());gengerateJsonString(users,count);return SUCCESS;}}
异常
Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: Object is nullThe problematic instruction:----------==> ${msg[0]} [on line 68, column 29 in org/apache/struts2/dispatcher/error.ftl]----------Java backtrace for programmers:----------freemarker.template.TemplateModelException: Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: Object is nullat freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:136)at freemarker.ext.beans.SimpleMethodModel.get(SimpleMethodModel.java:146)at freemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:111)at freemarker.core.DynamicKeyName._getAsTemplateModel(DynamicKeyName.java:90)at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)at freemarker.core.Expression.getStringValue(Expression.java:93)at freemarker.core.DollarVariable.accept(DollarVariable.java:76)at freemarker.core.Environment.visit(Environment.java:196)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:196)at freemarker.core.IfBlock.accept(IfBlock.java:82)at freemarker.core.Environment.visit(Environment.java:196)at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:172)at freemarker.core.Environment.visit(Environment.java:351)at freemarker.core.IteratorBlock.accept(IteratorBlock.java:95)at freemarker.core.Environment.visit(Environment.java:196)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:196)at freemarker.core.IfBlock.accept(IfBlock.java:82)at freemarker.core.Environment.visit(Environment.java:196)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:196)at freemarker.core.Environment.process(Environment.java:176)at freemarker.template.Template.process(Template.java:232)at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:748)at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:505)at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)at java.lang.Thread.run(Unknown Source)Caused by: java.lang.NullPointerExceptionat freemarker.ext.beans.BeansWrapper.unwrapArguments(BeansWrapper.java:573)at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:109)... 38 more?