From isClosed() scroll the docs a bit up to the previous method and it sayz

<quote>
close

public void close()
           throws SQLException

    Releases this Connection object's database and JDBC resources immediately
instead of waiting for them to be automatically released.

    Calling the method close on a Connection object that is already closed is a
no-op.

    Note: A Connection object is automatically closed when it is garbage
collected. Certain fatal errors also close a Connection object.

    Throws:
        SQLException - if a database access error occurs

</quote>

This is in 1.4.2 and I am pretty sure it's been there in earlier versions.

Hope that helps

Gerd

http://java.sun.com/j2se/1.4.2/docs/api/java/sql/Connection.html#close()