运行时错误：严重: Servlet.service() for servlet action threw exception，请高手解决啊！

Question

2009-7-29 21:45:43 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.NullPointerException
at com.rjxy.exam.action.LoginAction.execute(LoginAction.java:53)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.rjxy.exam.util.FilterUTF.doFilter(FilterUTF.java:23)
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:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
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:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

Answer 1

java.lang.NullPointerException 
at com.rjxy.exam.action.LoginAction.execute(LoginAction.java:53)空指针异常。
去看看那里为null吧。

Answer 2

LoginAction.java:53
把这部分的代码粘出来。

Answer 3

at com.rjxy.exam.action.LoginAction.execute(LoginAction.java:53) 我想你开始就没有把 对象传进来...

Answer 4

LoginAction.java:53   这个类里  有空指针错误 。。去53行查看下
或是贴出LoginAction.java的代码

Answer 5

LoginAction.java:53  这个类里  有空指针错误 。。去53行查看下 
或是贴出LoginAction.java的代码 
 

Answer 6

空指针异常是最正常的java新手遇到的事情了 没什么 

Answer 7

打印下那里为null，LoginAction.java:53左右打印。