C3P0APPARENTDEADLOCK
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$DeadlockDetector@70929ab6 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending task
一,c3p0运行一段时间后报错如下
W 07-26_00:58:27 ThreadPoolAsynchronousRunner.java 608 com.mchange.v2.async.ThreadPoolAsynchronousRunner$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!
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="0"/>
<!--连接池用完时客户调用getConnection()后等待获取连接的时间，单位：毫秒。超时后会抛出-->
<!--SQLEXCEPTION，如果设置0，则无限等待。Default:0-->
<property name="checkoutTimeout" value="100"/>
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