关于登陆的session问题.在线等答案!

[skying1]

有时候能成功登陆,有时候出错.

HttpSession session=request.getSession(false);
if(session!=null){
session.invalidate();
session=request.getSession(true);
}
session.setAttribute("user_id",new Long(userbo.getRight_user().getId()));//报这里说空指针
session.setAttribute("user_role",role);
session.setAttribute("fgdw_id",new Long(userbo.getFgdwId()));


以下我Tomcat抛的异常.



java.lang.NullPointerException
at com.fgj.web.action.TzwUserAction.login(TzwUserAction.java:93)
at com.fgj.web.action.TzwUserAction.execute(TzwUserAction.java:63)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.fgj.sys.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:41)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:595)

[tcmis]

帮顶

[haoxiangni]

加上try{}catch{}试一下

[esprit0318]

看看TzwUserAction.java:93

[rain_z]

userbo 在
com.fgj.web.action.TzwUserAction.execute（）方法中没有被实例化，，没有赋值；

[ladofwind]

同上
-------------------------------------------------
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[Ivanhuang]

应该是userbo没有初始化

[likgui]

userbo.getRight_user().getId(）有问题，从userbo上找原因。

[schumiXsuse]

HttpSession session=request.getSession(false);

你把这里改成true试一下,HttpSession session=request.getSession(true);