请大家帮忙看看这是什么异常？

Question

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.pan.web.login.excute(login.java:69)
org.apache.jsp.login_jsp._jspService(login_jsp.java:64)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.

Answer 1

excute(login.java:69)
空指针错误，第69行

Answer 2

应该是使用了没有定义的变量之类的。NullPointException

Answer 3

org.apache.jsp.login_jsp._jspService(login_jsp.java:64)贸个方法或对象为空 你还调用他的方法！就会NullPointException

Answer 4

try
{
}
catch(SQLException e)
{
while(e!=null)
{
out.print(e.getMessage());
out.print(e.getErrorCode());
out.print(e.getSQLState());
e=e.getNextException();
}
}看看是什么信息...可以帮助你分析