jsp问题 什么错误啊 麻烦了

A Servlet Exception Has Occurred
java.lang.NullPointerException
	at org.apache.jsp.index$jsp._jspService(index$jsp.java:114)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:1264)
	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:201)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:381)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:473)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:1264)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:215)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
	at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2366)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
	at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1005)
	at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1098)
	at java.lang.Thread.run(Unknown Source)

追问：是不是没连接上数据库

答案：明显的空指针啊 ，看看你的代码 哪是不是引用了空值

其他：空指针错误
利用断点追踪，一步一步看哪个对象是null，最终找出问题 空指针，贴代码 现在只知道是空值异常，你调试看看，自己判断下可能是哪个值是空的。因为没贴具体代码，不好判断呀。

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