我的编程环境为TOMCAT6.0.13,MYSQL5.0,JBUILDER2006,SERVLET API 2.5,JSDK1.6.0_02-b06,MYSQL的驱动为mysql-connector-java-5.0.7-bin.jar。
在自己的应用程序中的WEB.XML中设置了连接参数：com.mysql.jdbc.Driver,jdbc:mysql://localhost:3306/mysql,root,12345678
在IE中浏览运行出现如下错误：
HTTP Status 500 -
--------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet.init() for servlet CreateDBServlet threw exception
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:852)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:584)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1508)
java.lang.Thread.run(Unknown Source)
root cause
java.lang.NullPointerException
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
org.sunxin.lesson.jsp.bookstore.CreateDBServlet.init(CreateDBServlet.java:22)
javax.servlet.GenericServlet.init(GenericServlet.java:212)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:852)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:584)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1508)
java.lang.Thread.run(Unknown Source)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.
--------------------------------------------
Apache Tomcat/6.0.13
------解决方案--------------------
另外,init()函数中取得web.xml中的值是这样子滴::::
String value = getServletContext().getInitParameter( "driverClass ");
代码迷推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.daimami.com/search?q=317