Could not load com.mysql.jdbc.SQLError. 错误

Could not load com.mysql.jdbc.SQLError.

信息: Illegal access: this web application instance has been stopped already. Could not load com.mysql.jdbc.SQLError. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1246)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3134)
at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:1616)
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4223)
at com.mysql.jdbc.ConnectionImpl.cleanup(ConnectionImpl.java:1257)
at com.mysql.jdbc.ConnectionImpl.finalize(ConnectionImpl.java:2663)
at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)
编网站是老碰到的异常
struts+tomcat+netbeans+ajax+mysql

问题补充：网站能正常工作，包都导对的

解决方法：

如果用连接池 把mysql的驱动包放入到 tomcat5.x 版本的 common\lib，如果是tomcat 6.x就直接放到 lib目录下 ，的下面 这样就会好 如果用jdbc 那就放到工程下面的lib就ok了