DBCP1.2.2阻塞Tomcat线程BUG
jconsole分析线程堆栈，jvi跟踪线程运行情况，分析得出连接问题，并且网上找到了问题的BUG
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https://issues.apache.org/jira/browse/DBCP-226
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http://stackoverflow.com/questions/4853732/blocking-on-dbcp-connection-pool-open-and-close-connnection-is-database-conne
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http://hi.baidu.com/lettoo/item/31a512f87893fec00cd1c86c
