请问出错信息代表的含义啊，俺晕晕的

jsp页面的出错信息中常有这样的：Internal   Servlet   Error:  
   
  javax.servlet.ServletException  
  at   org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:459)  
  at   jsp.load._0002fjsp_0002fload_0002fzhuce_0005fok_0002ejspzhuce_0005fok_jsp_5._jspService(_0002fjsp_0002fload_0002fzhuce_0005fok_0002ejspzhuce_0005fok_jsp_5.java:111)  
  at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)  
  at   javax.servlet.http.HttpServlet.service(HttpServlet.java:853)  
  at   org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.java:130)  
  at   javax.servlet.http.HttpServlet.service(HttpServlet.java:853)  
  at   org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)  
  at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)  
  at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)  
  at   javax.servlet.http.HttpServlet.service(HttpServlet.java:853)  
  at   org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)  
  at   org.apache.tomcat.core.Handler.service(Handler.java:287)  
  at   org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)  
  at   org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)  
  at   org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)  
  at   org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)  
  at   org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)  
  at   org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)  
  at   java.lang.Thread.run(Thread.java:484)  
   
  Root   cause:    
  java.lang.NullPointerException  
  at   jsp.load._0002fjsp_0002fload_0002fzhuce_0005fok_0002ejspzhuce_0005fok_jsp_5._jspService(_0002fjsp_0002fload_0002fzhuce_0005fok_0002ejspzhuce_0005fok_jsp_5.java:95)  
  at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)  
  at   javax.servlet.http.HttpServlet.service(HttpServlet.java:853)  
  at   org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.java:130)  
  at   javax.servlet.http.HttpServlet.service(HttpServlet.java:853)  
  at   org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)  
  at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)  
  at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)  
  at   javax.servlet.http.HttpServlet.service(HttpServlet.java:853)  
  at   org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)  
  at   org.apache.tomcat.core.Handler.service(Handler.java:287)  
  at   org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)  
  at   org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)  
  at   org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)  
  at   org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)  
  at   org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)  
  at   org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)  
  at   java.lang.Thread.run(Thread.java:484)  
   
  请问是什么意思呢，我根本不明白，请大家指教一下啊，不胜感激！ 问题点数：40、回复次数：3Top

1 楼zxhong（红透半边天）回复于 2003-02-04 00:19:23 得分 20

java.lang.NullPointerException  
  空指针意外，一般是没有捕获对象为null时的意外！Top

2 楼zhu_liping（zz）回复于 2003-02-04 12:20:07 得分 20

对null对象进行操作了的，  
  首先对你的对象进行判断,是否为空Top

3 楼hongchang（wang）回复于 2003-02-04 15:28:33 得分 0

感谢大家的解答，可是我还有个问题哦，java.lang类具体是代表的什么意思呢，我刚学jsp，有太多不明白的地方了，还请大家多多解答啊，谢谢，新年好。Top

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