NPE --- Key: HHH-1503 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1503 Project: Hibernate3 Issue Type: Bug Components: core Affects Versions: 3.1.2 Reporter: Igor I Nikonoff Priority: Minor ConnectionManager.java releaseBorrowedConnection method NEED FIX public void releaseBorrowedConnection() { if ( borrowedConnection != null ) { BorrowedConnectionProxy.renderUnuseable( borrowedConnection ); borrowedConnection = null; } } because in BorrowedConnectionProxy.renderUnuseable method following check to not null borrowedConnection. PS. orig method is: public void releaseBorrowedConnection() { if ( borrowedConnection != null ) { borrowedConnection = null; BorrowedConnectionProxy.renderUnuseable( borrowedConnection ); } }