PermGen space错误解决方法
http://www.cnblogs.com/xwdreamer/archive/2011/11/21/2296930.html
http://blog.csdn.net/fox009/article/details/5633007
http://hi.baidu.com/like_dark/blog/item/19c1948b3292b0799f2fb468.html
http://anyeeye.iteye.com/blog/444624
http://hi.baidu.com/chssheng2007/item/3f8cd7e7d41ed80c8c3ea8c2
http://www.mkyong.com/tomcat/tomcat-javalangoutofmemoryerror-permgen-space/
昨天利用注解整合了一下ssh，去掉了hibernate的配置文件，利用maven管理这个项目的jar包，发现自己一不小心就把不同的版本包给弄进了lib目录里面，导致一直报那些NoClassDefError,只能找到项目的物理lib目录，把所有的jar删除了，让maven再自己加载回来，真是蛋疼啊。
解决了这个问题，接下来的问题是那个tomcat内存的问题,就是上面那个
-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc严重: The web application [/Application] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads严重: The web application [/Application] appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed to stop it. This is very likely to create a memory leak.-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads严重: The web application [/Application] appears to have started a thread named [AWT-Windows] but has failed to stop it. This is very likely to create a memory leak.-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads严重: The web application [/Application] appears to have started a thread named [Thread-14] but has failed to stop it. This is very likely to create a memory leak.-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap严重: The web application [/Application] created a ThreadLocal with key of type [net.sf.json.AbstractJSON$1] (value [net.sf.json.AbstractJSON$1@3661eeb]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.-11-21 21:10:50 org.apache.catalina.core.ApplicationContext log
