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C3P0 APPARENT DEADLOCK

一,c3p0运行一段时间后报错如下

W 07-26_00:58:27 ThreadPoolAsynchronousRunner.java 608 com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@70929ab6 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks! 
W 07-26_00:58:39 ThreadPoolAsynchronousRunner.java 608 com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@4496b93a -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!

二,解决方法如下


1,更新c3p0版本到0.9.2.1 该版本优化了获取connection的规则

2,首先修改c3p0配置参数

<!--JDBC的标准参数,用以控制数据源内加载的PreparedStatements数量。但由于预缓存的statements
       属于单个connection而不是整个连接池。所以设置这个参数需要考虑到多方面的因素。
       如果maxStatements与maxStatementsPerConnection均为0,则缓存被关闭。Default: 0-->
 <property name="maxStatements" value=http://www.mamicode.com/"0"/>>