我在成功添加数据后,出现下面的错误,是什么原因呢?
我在成功添加数据后,出现下面的错误,是什么原因呢?请指教.
2007-8-28   15:35:10   org.apache.catalina.core.StandardWrapperValve   invoke
严重:   Servlet.service()   for   servlet   jsp   threw   exception
java.lang.NullPointerException
at   org.apache.jsp.jsp.infoset_jsp._jspService(infoset_jsp.java:140)
at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:390)
at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
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   org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
at   org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at   jmzc.comm.CheckLoginServlet.doFilter(CheckLoginServlet.java:46)
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:228)
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:105)
at   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at   org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:212)
at   org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:818)
at   org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:624)
at   org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at   java.lang.Thread.run(Thread.java:595)

------解决方案--------------------
这个肯定是没有插入成功
必须有个判空的操作