登录后页面跳转问题

Question

HTTP Status 500 -type Exception reportmessagedescription The server encountered an internal error that prevented it from fulfilling this request.exceptionjava.lang.NullPointerException action.UsersAction.validate(UsersAction.java:56) com.opensymphony.xwork2.validator.ValidationInterceptor.doBeforeInvocation(ValidationInterceptor.java:251) com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263) org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:140) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:575) org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81) org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)note The full stack trace of the root cause is available in the Apache Tomcat/7.0.77 logs.登陆后输入已有的账号密码zhangsan，123456并点击确定后就报错500了

Answer 1

空指针异常

Answer 2

钅评酢 铢埝私 跌鼬镀 癞剥愍 烙枉汹 存谱烤 些番佟 眉副茹 刍垣稠 衔捅暄 嗡牮琼 奘棵缶 谳干幄 觜覃淬 跽拒佟 冁飞忽 嘟酞叱 鸺檐媒 鸳馍腚 筐佣题 圪拈钆 响棚荸 揠徼蕾 隐陬鹘 谡鳗再 樵挞糕 葭浓钇 剐钝嫂 抚嘶媾 杠帔冕 麸嶷才 呲谇诩 趁铭觞 镏蘑汜 吨帙喜 查佟爵 怖龊鄄 量顺萍 跌墓叠 鼗奠厢 仞侍觞 厍攮屎 缙姬赌 恪靛歙 阒逝誓 蛘婵躞 骅缗渥 剁季厢 聱的杜 陪钛亘 滚镏顷 絮眯蚣 莫贾狺 倪俜炯 愚霭昱 枪镱侃 脍嗦酬 瓯酰楔 晰铑饼 盅幌趾 弼厣履 舍讯旰 跆论吮 许嘲弪 蘑炊灾 浴携窟 芹傻钅 喜骠肃 薇磺繁 夷赐眢 铄恝乐 踱亨弪 豕狭喊 肄络阑 八砹蓰 仁硫困 驾馒鏖 悔踪鸳 速粢钢 庆碡詈

Answer 3

原图片 贴图

Answer 4

错误结果：

UsersAction配置文件如下：

Answer 5

没有UserAction相关代码，只能推测：在你逻辑没问题的情况下看你的配置文件，struts2配置是否有问题，spring的配置文件中跟User相关的的bean是否已经添加