Druid在tomcat中报 java.lang.NoClassDefFound?报错

@wenshao 你好，想跟你请教个问题：druid 在 apache tomcat 里面经常要出现这样的报错，百度了很久不得其解。

九月 17, 2014 9:53:31 上午 org.apache.catalina.loader.WebappClassLoader loadClass
信息: Illegal access: this web application instance has been stopped already.  Could not load com.mysql.jdbc.ProfilerEventHandlerFactory.  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:1612)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4677)
at com.mysql.jdbc.ConnectionImpl.close(ConnectionImpl.java:1615)
at com.alibaba.druid.filter.FilterChainImpl.connection_close(FilterChainImpl.java:169)
at com.alibaba.druid.filter.FilterAdapter.connection_close(FilterAdapter.java:776)
at com.alibaba.druid.filter.logging.LogFilter.connection_close(LogFilter.java:415)
at com.alibaba.druid.filter.FilterChainImpl.connection_close(FilterChainImpl.java:165)
at com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl.close(ConnectionProxyImpl.java:115)
at com.alibaba.druid.util.JdbcUtils.close(JdbcUtils.java:82)
at com.alibaba.druid.pool.DruidDataSource.shrink(DruidDataSource.java:1915)
at com.alibaba.druid.pool.DruidDataSource$DestroyConnectionThread.run(DruidDataSource.java:1733)


Exception in thread "Druid-ConnectionPool-Destory-806406583" java.lang.NoClassDefFoundError: com/mysql/jdbc/ProfilerEventHandlerFactory
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4677)
at com.mysql.jdbc.ConnectionImpl.close(ConnectionImpl.java:1615)
at com.alibaba.druid.filter.FilterChainImpl.connection_close(FilterChainImpl.java:169)
at com.alibaba.druid.filter.FilterAdapter.connection_close(FilterAdapter.java:776)
at com.alibaba.druid.filter.logging.LogFilter.connection_close(LogFilter.java:415)
at com.alibaba.druid.filter.FilterChainImpl.connection_close(FilterChainImpl.java:165)
at com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl.close(ConnectionProxyImpl.java:115)
at com.alibaba.druid.util.JdbcUtils.close(JdbcUtils.java:82)
at com.alibaba.druid.pool.DruidDataSource.shrink(DruidDataSource.java:1915)
at com.alibaba.druid.pool.DruidDataSource$DestroyConnectionThread.run(DruidDataSource.java:1733)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.ProfilerEventHandlerFactory
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
... 10 more
[Druid-ConnectionPool-Destory-116271079] DEBUG druid.sql.Connection - {conn-10001} closed
Exception in thread "Druid-ConnectionPool-Destory-2069188819" java.lang.NoClassDefFoundError: com/mysql/jdbc/ProfilerEventHandlerFactory
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4677)
at com.mysql.jdbc.ConnectionImpl.close(ConnectionImpl.java:1615)
at com.alibaba.druid.util.JdbcUtils.close(JdbcUtils.java:82)
at com.alibaba.druid.pool.DruidDataSource.shrink(DruidDataSource.java:1915)
at com.alibaba.druid.pool.DruidDataSource$DestroyConnectionThread.run(DruidDataSource.java:1733)

九月 17, 2014 9:53:31 上午 org.apache.catalina.loader.WebappClassLoader loadClass
信息: Illegal access: this web application instance has been stopped already.  Could not load com.mysql.jdbc.ProfilerEventHandlerFactory.  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:1612)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4677)
at com.mysql.jdbc.ConnectionImpl.close(ConnectionImpl.java:1615)
at com.alibaba.druid.filter.FilterChainImpl.connection_close(FilterChainImpl.java:169)
at com.alibaba.druid.filter.FilterAdapter.connection_close(FilterAdapter.java:776)
at com.alibaba.druid.filter.logging.LogFilter.connection_close(LogFilter.java:415)
at com.alibaba.druid.filter.FilterChainImpl.connection_close(FilterChainImpl.java:165)
at com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl.close(ConnectionProxyImpl.java:115)
at com.alibaba.druid.util.JdbcUtils.close(JdbcUtils.java:82)
at com.alibaba.druid.pool.DruidDataSource.shrink(DruidDataSource.java:1915)
at com.alibaba.druid.pool.DruidDataSource$DestroyConnectionThread.run(DruidDataSource.java:1733)


Exception in thread "Druid-ConnectionPool-Destory-806406583" java.lang.NoClassDefFoundError: com/mysql/jdbc/ProfilerEventHandlerFactory
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4677)
at com.mysql.jdbc.ConnectionImpl.close(ConnectionImpl.java:1615)
at com.alibaba.druid.filter.FilterChainImpl.connection_close(FilterChainImpl.java:169)
at com.alibaba.druid.filter.FilterAdapter.connection_close(FilterAdapter.java:776)
at com.alibaba.druid.filter.logging.LogFilter.connection_close(LogFilter.java:415)
at com.alibaba.druid.filter.FilterChainImpl.connection_close(FilterChainImpl.java:165)
at com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl.close(ConnectionProxyImpl.java:115)
at com.alibaba.druid.util.JdbcUtils.close(JdbcUtils.java:82)
at com.alibaba.druid.pool.DruidDataSource.shrink(DruidDataSource.java:1915)
at com.alibaba.druid.pool.DruidDataSource$DestroyConnectionThread.run(DruidDataSource.java:1733)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.ProfilerEventHandlerFactory
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
... 10 more
[Druid-ConnectionPool-Destory-116271079] DEBUG druid.sql.Connection - {conn-10001} closed
Exception in thread "Druid-ConnectionPool-Destory-2069188819" java.lang.NoClassDefFoundError: com/mysql/jdbc/ProfilerEventHandlerFactory
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4677)
at com.mysql.jdbc.ConnectionImpl.close(ConnectionImpl.java:1615)
at com.alibaba.druid.util.JdbcUtils.close(JdbcUtils.java:82)
at com.alibaba.druid.pool.DruidDataSource.shrink(DruidDataSource.java:1915)
at com.alibaba.druid.pool.DruidDataSource$DestroyConnectionThread.run(DruidDataSource.java:1733)