jsp错误调试

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JSP 调试 JSP调试是保证代码质量和功能实现的关键环节。本文介绍了JSP调试的方法、技巧以及常用工具，希望对开发者有所帮助。在实际开发过程中，要善于运用各种调试方法，提高调试效率，确保项目顺利进行。阅读详情

HTTP Status 500 -

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type Exception report

message

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

exception

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:316)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:277)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:223)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

root cause

java.lang.NullPointerException
myclass.nfjips.executeQuery(nfjips.java:72)
org.apache.jsp.index_jsp._jspService(index_jsp.java:224)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:268)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:277)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:223)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.22 logs.

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可能是什么原因?

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