java.sql.SQLException: Connection is invalid

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java.sql.SQLException: Connection is invalid
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.testPooledConnection(C3P0PooledConnectionPool.java:196)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.refurbishIdleResource(C3P0PooledConnectionPool.java:136)
at com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask.run(BasicResourcePool.java:1394)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:368)

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