public PoolableConnection(Connection conn,
    ObjectPool pool) 
{
                         
        super(conn);
        _pool = pool;
}

Parameters:

conn - my underlying connection

pool - the pool to which I should return when closed

 public PoolableConnection(Connection conn,
    ObjectPool pool,
    AbandonedConfig config) 
{
        super(conn, config);
        _pool = pool;
}

Parameters:

conn - my underlying connection

pool - the pool to which I should return when closed

config - the abandoned configuration settings

 public synchronized  void close() throws SQLException 
{
        boolean isClosed = false;
        try {
            isClosed = isClosed();
        } catch (SQLException e) {
            try {
                _pool.invalidateObject(this); // XXX should be guarded to happen at most once
            } catch (Exception ie) {
                // DO NOTHING the original exception will be rethrown
            }
            throw new SQLNestedException("Cannot close connection (isClosed check failed)", e);
        }
        if (isClosed) {
            try {
                _pool.invalidateObject(this); // XXX should be guarded to happen at most once
            } catch (Exception ie) {
                // DO NOTHING, "Already closed" exception thrown below
            }
            throw new SQLException("Already closed.");
        } else {
            try {
                _pool.returnObject(this); // XXX should be guarded to happen at most once
            } catch(SQLException e) {
                throw e;
            } catch(RuntimeException e) {
                throw e;
            } catch(Exception e) {
                throw new SQLNestedException("Cannot close connection (return to pool failed)", e);
            }
        }
}

Returns me to my pool.

 public  void reallyClose() throws SQLException 
{
        super.close();
}

Actually close my underlying Connection .