c3p0 Connection Checkin

I'm trying to implement a solution with c3p0 for the first time. I understand how to initialize the connection pool and "checkout" a Connection from the pool as follows:

ComboPooledDataSource cpds = new ComboPooledDataSource();
cpds.setDriverClass(driverClass);
cpds.setJdbcUrl(url);
cpds.setUser(username);
cpds.setPassword(password);
Connection conn = cpds.getConnection(username, password);

But I am having trouble finding out how to "checkin" an already used Connection to go back into the pool. How would I go about doing th开发者_运维问答is? Is there something that I'm doing wrong here?

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Freeing up is totally transparent to the user. See here for further explanation.

Be shure to close() the Connection and hold no further reference (that would avoid proper GC).

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I believe the connection is returned to the pool when you close it.