org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
异常信息如下：
2010-2-4 11:53:55 org.apache.catalina.startup.HostConfig checkResources
信息: Reloading context [/ssh]
2010-2-4 11:53:55 org.apache.catalina.core.ApplicationContext log
信息: Closing Spring root WebApplicationContext
2010-2-4 11:53:55 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
严重: A web application registered the JBDC 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.
2010-2-4 11:53:55 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: A web application created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@12c937c]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@186dd93]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.
2010-2-4 11:53:55 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: A web application created a ThreadLocal with key of type [org.springframework.core.NamedThreadLocal] (value [Prototype beans currently in creation]) and a value of type [null] (value [null]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.
2010-2-4 11:53:55 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: A web application created a ThreadLocal with key of type [null] (value [com.sun.faces.config.ConfigureListener$1@13d0fea]) and a value of type [null] (value [null]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.
2010-2-4 11:53:55 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: A web application created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@12c937c]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1dffb78]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.
2010-2-4 11:53:55 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: A web application created a ThreadLocal with key of type [org.springframework.core.NamedThreadLocal] (value [Actual transaction active]) and a value of type [null] (value [null]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.
2010-2-4 11:53:55 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: A web application created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@12c937c]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1f6ae4d]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.
2010-2-4 11:53:55 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: A web application created a ThreadLocal with key of type [org.springframework.core.NamedThreadLocal]
解决办法可参考http://forum.springsource.org/showthread.php?87335-Failure-to-unregister-the-MySQL-JDBC-Driver
把JDBC驱动复制到tomcat/lib 目录下
当项目没有stop时，redeploy产生的问题
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