关于JSP的问题,求救
来源:百度知道 编辑:UC知道 时间:2024/06/29 21:31:34
之前挂在服务器上的网站可以正常浏览,但这两天不知道怎么回事,突然出现问题,连接不上数据库,所有的页面都连不上,报以下错误:
HTTP Status 500 -
--------------------------------------------------------------------------------
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:853)
root cause
java.lang.NullPointerException
PE_BEAN.query.zy_op_cpclass.seachcpClass(zy_op_cpclass.java:42)
org.apache.jsp.cpzs_jsp._jspService(cpzs_jsp.java:197)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.se
HTTP Status 500 -
--------------------------------------------------------------------------------
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:853)
root cause
java.lang.NullPointerException
PE_BEAN.query.zy_op_cpclass.seachcpClass(zy_op_cpclass.java:42)
org.apache.jsp.cpzs_jsp._jspService(cpzs_jsp.java:197)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.se
java.lang.NullPointerException
空指钟错误,
你看你程序的这一行
zy_op_cpclass.java
第42行
很有可能是你和数据库的链接失败
失败的原因有很多种。
一是物理是就失去了链接
二是你的程序有问题。数据库无法创建新的会话。