2008-6-2 15:29:26 org.apache.struts.action.RequestProcessor processException
警告: Unhandled Exception thrown: class java.lang.NullPointerException 2008-6-2 15:29:26 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servletaction的Servlet.service()发生意外(exception)
java.lang.NullPointerException 这是怎么回事呢
警告: Unhandled Exception thrown: class java.lang.NullPointerException 2008-6-2 15:29:26 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servletaction的Servlet.service()发生意外(exception)
java.lang.NullPointerException 这是怎么回事呢
该怎么找出问题的所在呢,唉~~新手,代价啊
警告: Unhandled Exception thrown: class java.lang.NullPointerException
2008-6-2 15:29:26 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servletaction的Servlet.service()发生意外(exception)
java.lang.NullPointerException
at j2eebbs.user.action.UserLoginAction.execute(UserLoginAction.java:42)
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.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)是不是得一行一行找啊
应该在UserLoginAction类的42行发生了空指针异常。
就是一个对象为null,没有判断就适用该对象的方法了。
可能性大些
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419) 就找这两个类的42和419行