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  • c3p0出现 An attempt by a client to checkout a Connection has timed out

    java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
    	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
    	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
    	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)
    	at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
    Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@a0e5175 -- timeout at awaitAvailable()
    	at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1317)
    	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
    	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:590)
    	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:590)
    	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:590)
    	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:590)
    	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:590)
    	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:590)
    	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:590)
    	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
    	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
    	... 7 more

    解决方法:缓存关闭也就是把c3p0.max_statements 设置成0(假设不设置为0,可能造成connection不能真正被关闭),这样就不会有缓存的preparedstatement。而设置的c3p0.idle_test_period又小于c3p0.timeout,这种设置应该解决这个问题了。
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  • 原文地址:https://www.cnblogs.com/cxchanpin/p/7040546.html
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