https://issues.apache.org/jira/browse/AMQ-3315 - Allow socket option soLinger to be enabled on TcpTransport. url transport args ?soLinger=0 and ?transport.soLinger (for the broker accepted connectons) are now supported. a value > -1 enabled and sets the timeout to that value
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/transport/tcp/TcpTransport.java