Question

JSP服务器

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:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NullPointerException
com.wgh.DB.connDB.executeQuery(connDB.java:58)
org.apache.jsp.index_jsp._jspService(index_jsp.java:49)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.

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请帮我看一下是什么问题，怎么解决。

Answer 1

org.apache.jsp.index_jsp._jspService(index_jsp.java:49)

可能是连接数据库时resultSet为null，得到了空指针异常。
需要看报错code的地方才能确认。

Answer 2

不能让你的的对象为空！对可能为空的对象进行判断！！

Answer 3

贴connDB.java的代码