Question

jsp连接数据库报错

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
wzws.ClaaUtil.getAllClaa(ClaaUtil.java:16)
org.apache.jsp.wzws.claa_005fmanager_jsp._jspService(claa_005fmanager_jsp.java:70)
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.

Answer 1

java.lang.NullPointerException
wzws.ClaaUtil.getAllClaa(ClaaUtil.java:16)

这是空指针异常，哪是数据库连的时候报错呀。
看一下ClaaUtil.java里面的getAllClaa方法，在第16行，有一个变量的值为空，而你调用了它的方法。找到为空的变量，然后，就知道怎么解决了吧？

天天开心呀。。。
:)

Answer 2

你不能这么给我们看异常呀，最好把你的连库信息发过来，提示一个空指针

Answer 3

java.lang.NullPointerException这一句明明就是java中的空值异常，如果是数据库异常应该是sqlException