src/main/java/org/apache/commons/dbcp2/datasources/CPDSConnectionFactory.java [234:240]:
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    @Override
    public void connectionErrorOccurred(final ConnectionEvent event) {
        final PooledConnection pc = (PooledConnection) event.getSource();
        if (null != event.getSQLException()) {
            System.err.println("CLOSING DOWN CONNECTION DUE TO INTERNAL ERROR (" + event.getSQLException() + ")");
        }
        pc.removeConnectionEventListener(this);
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src/main/java/org/apache/commons/dbcp2/datasources/KeyedCPDSConnectionFactory.java [165:171]:
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    @Override
    public void connectionErrorOccurred(final ConnectionEvent event) {
        final PooledConnection pc = (PooledConnection) event.getSource();
        if (null != event.getSQLException()) {
            System.err.println("CLOSING DOWN CONNECTION DUE TO INTERNAL ERROR (" + event.getSQLException() + ")");
        }
        pc.removeConnectionEventListener(this);
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