java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

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    Root Cause Analysis

    1. com.mchange.v2.resourcepool.TimeoutException

      A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@4fcfacd6 -- timeout at awaitAvailable()

      at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable()
    2. c3p0:JDBC DataSources/Resource Pools
      C3P0PooledConnectionPool.checkoutPooledConnection
      1. com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1317)[c3p0-0.9.1.2.jar:0.9.1.2]
      2. com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)[c3p0-0.9.1.2.jar:0.9.1.2]
      3. com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)[c3p0-0.9.1.2.jar:0.9.1.2]
      4. com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)[c3p0-0.9.1.2.jar:0.9.1.2]
      5. com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)[c3p0-0.9.1.2.jar:0.9.1.2]
      6. com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)[c3p0-0.9.1.2.jar:0.9.1.2]
      7. com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)[c3p0-0.9.1.2.jar:0.9.1.2]
      7 frames
    3. org.hibernate.jpa
      EntityManagerFactoryBuilderImpl.build
      1. org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:802)[hibernate-entitymanager-5.0.3.Final.jar:5.0.3.Final]
      1 frame