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The test has this comment: * NOTE: * This test requires at least a setup similar to the following in * /etc/hosts file (or the windows equivalent). I.e. it expects it to * be multi-homed and not both being the loop-back interface. * For example: * ----->8-------- /etc/hosts ----------->8--- * 127.0.0.1 localhost * 192.168.0.1 localhost * ----->8-------- /etc/hosts ----------->8--- However, when one configures the /etc/hosts file like the above the test still fails trivially with: Ignoring manual test since no more than one IPs are configured for 'localhost' As it turns out JDK-8145982 changed the original test by filtering out loopback interfaces from the interface list. The original logic used InetAddress.getAllByName("localhost") which included loopback addresses such as 127.0.0.1. The logic post JDK-8145982 does no longer. As a result the condition in the test's main method is wrong: List<InetAddress> addrs = getAddressesForLocalHost(); if (addrs.size() < 2) { System.out.println("Ignoring manual test since no more than one IPs are configured for 'localhost'"); return; } The condition should be addrs.size() < 1 rather than 2. The test needs at least two separate ip:port pairs to be able to bind to in order to not trivially pass. For example loop back address and the IP of the host should be sufficient.
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