javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Could not open connection

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    com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.

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    Root Cause Analysis

    1. com.mchange.v2.resourcepool.CannotAcquireResourceException

      A ResourcePool could not acquire a resource from its primary factory or source.

      at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable()
    2. c3p0:JDBC DataSources/Resource Pools
      C3P0PooledConnectionPool.checkoutPooledConnection
      1. com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319)
      2. com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
      3. com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
      4. com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
      4 frames