Question

JSP运行报错 错误代码如下 求高手解决

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:532)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:426)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

root cause

java.lang.NullPointerException
org.apache.jsp.yu.login_jsp._jspService(login_jsp.java:91)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.

Answer 1

只看这些依据不是很充足，报空指针的异常说明传值错误，或者是jsp调用业务类时返回值错误，或者调用错误等种种可能，要学会根据堆栈异常寻找错误，顺着关键的一条线，或者设置断点仔细找一下。只要认真点，问题应该很容易解决的！

Answer 2

NullPointerException
哪一个地方你用到传来的值了，但是值没有传过来

Answer 3

你用到的某个变量的值是null，报的是空指针错误可以Hi我

Answer 4

报的是空指针错误，，但是你还是把源代码发上来吧，，别人也好改呀。。

Answer 5

代码贴出了