Exception————c3p0(The web application [/C-PDMS2] appears to have started a thread named)

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本文详细介绍了Tomcat服务器中因C3P0连接池未正确关闭导致的内存泄漏问题及解决办法。通过调用正确的关闭方法，可以避免线程未被及时释放而引发的内存泄露。

异常：

严重: The web application [/C-PDMS2] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0] but has failed to stop it. This is very likely to create a memory leak.

2013-1-30 17:08:57 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [/C-PDMS2] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1] but has failed to stop it. This is very likely to create a memory leak.

2013-1-30 17:08:57 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [/C-PDMS2] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2] but has failed to stop it. This is very likely to create a memory leak.

2013-1-30 17:08:57 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap

原因：

在Tomcat关闭的时候还有线程没有关闭，这会引起内存泄露，所以Tomcat会自己强行关闭。

解决方案：

看上面的异常可得知是C3P0引起的，因为在C3P0Util中用到了ThreadLocal这个类，所以在服务器关闭的时候调用comboPooledDataSource .close()方法，到是貌似可以解决。

但是又报了下面的错：

严重: The web application [/C-PDMS2] appears to have started a thread named [Resource Destroyer in BasicResourcePool.close()] but has failed to stop it. This is very likely to create a memory leak.

2013-1-30 17:20:04 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap

调用connLocal .remove()方法，貌似可以解决问题。