How do return borrowed objects?

[ghost]

Please tell me how do i return borrowed object, as i set max limit to "1"

config.setMaxTotal(1);

and after sending 1 mail i can't able to borrrow another object from pool.

[nithril]

See test example and the test case. Connection must be borrowed inside a try with resource statement:

try (ClosableSmtpConnection transport = smtpConnectionPool.borrowObject()) {
}