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java.lang.StackOverflowError: 	at java.lang.Exception.(Exception.java:41)	at java.lang.RuntimeException.(RuntimeException.java:43)	at java.lang.ClassCastException.(ClassCastException.java:39)	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$C3P0PooledConnectionNestedLockLockFetcher.getInUseLock(C3P0PooledConnectionPool.java:127)	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.refurbishResourceOnCheckout(C3P0PooledConnectionPool.java:298)	at com.mchange.v2.resourcepool.BasicResourcePool.attemptRefurbishResourceOnCheckout(BasicResourcePool.java:1682)	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:528)	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:563)	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:563)	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:563)	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:563)