DriverManagerConnectionPoolConnection not closed, check your code!

[Michael Maram]

Hi all

I am receiving the following message a number of times following multiple
user concurrent hits -

        DriverManagerConnectionPoolConnection not closed, check your code!

I am physically closing the connection after the process of each request.
What does the close() method on the connection do? Will it free the
connection back to the pool? That's what it should do. Why am I still
getting this message? Below is my data-source definition.

<data-source
                name="test1"
                class="com.evermind.sql.DriverManagerDataSource"
                ejb-location="jdbc/OracleDS1"
                pooled-location="jdbc/OraclePooledDS1"
                xa-location="jdbc/xa/OracleXADS1"
                url="jdbc:oracle:thin:@test:1521:pilot"
                connection-driver="oracle.jdbc.driver.OracleDriver"
                username="test"
                password="test"
                max-connections="500"
        />

PS - I have checked the listings but found no solution.

In anticipation.