src/main/java/org/apache/commons/dbcp2/datasources/CPDSConnectionFactory.java [90:111]:
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        } catch (final Exception ex) {
            throw new SQLException("Error closing connection pool", ex);
        }
    }

    /**
     * This will be called if the Connection returned by the getConnection method came from a PooledConnection, and the
     * user calls the close() method of this connection object. What we need to do here is to release this
     * PooledConnection from our pool...
     */
    @Override
    public void connectionClosed(final ConnectionEvent event) {
        final PooledConnection pc = (PooledConnection) event.getSource();
        // if this event occurred because we were validating, ignore it
        // otherwise return the connection to the pool.
        if (!validatingSet.contains(pc)) {
            final PooledConnectionAndInfo pci = pcMap.get(pc);
            if (pci == null) {
                throw new IllegalStateException(NO_KEY_MESSAGE);
            }

            try {
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src/main/java/org/apache/commons/dbcp2/datasources/KeyedCPDSConnectionFactory.java [80:101]:
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        } catch (final Exception ex) {
            throw new SQLException("Error closing connection pool", ex);
        }
    }

    /**
     * This will be called if the Connection returned by the getConnection method came from a PooledConnection, and the
     * user calls the close() method of this connection object. What we need to do here is to release this
     * PooledConnection from our pool...
     */
    @Override
    public void connectionClosed(final ConnectionEvent event) {
        final PooledConnection pc = (PooledConnection) event.getSource();
        // if this event occurred because we were validating, or if this
        // connection has been marked for removal, ignore it
        // otherwise return the connection to the pool.
        if (!validatingSet.contains(pc)) {
            final PooledConnectionAndInfo pci = pcMap.get(pc);
            if (pci == null) {
                throw new IllegalStateException(NO_KEY_MESSAGE);
            }
            try {
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