NullPointerException thrown when calling ManagedConnection.isClosed()

Hello all,
I'm using commons-dbcp 1.4, and I found this exception. I don't if it's reported already before, I have done some searches in google, but nothing found.

Here is the call stack.

2015-08-18 15:01:50,091 [Thread-49] console : ERROR - ... 44 more
2015-08-18 16:04:57,963 [Thread-45] console : ERROR - java.lang.NullPointerException
2015-08-18 16:04:57,965 [Thread-45] console : ERROR - at org.apache.commons.dbcp.DelegatingConnection.isClosed(DelegatingConnection.java:386)
2015-08-18 16:04:57,965 [Thread-45] console : ERROR - at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.releaseConnection(LogicalConnectionImpl.java:237)
2015-08-18 16:04:57,965 [Thread-45] console : ERROR - at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.aggressiveRelease(LogicalConnectionImpl.java:200)
2015-08-18 16:04:57,965 [Thread-45] console : ERROR - at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.afterTransaction(JdbcCoordinatorImpl.java:272)
2015-08-18 16:04:57,965 [Thread-45] console : ERROR - at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.afterTransaction(TransactionCoordinatorImpl.java:144)
2015-08-18 16:04:57,965 [Thread-45] console : ERROR - at org.hibernate.engine.transaction.internal.jta.JtaTransaction.afterAfterCompletion(JtaTransaction.java:179)
2015-08-18 16:04:57,966 [Thread-45] console : ERROR - at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.rollback(AbstractTransactionImpl.java:219)

So when I debugged it, it created a ManagedConnection, which is a sub-class of DelegatingConnection, and the _conn is initialized with null, and the _closed is false by default. So when hibernate calls the isClosed(), it throws a nullpointer exception.

Could you guys tell me if in your side, or the hibernate side ?
Do not hesitate to contact me if you need more information.