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Prior to this patch, the test failed if the hostname returned by `startListening()` didn't match either the string "localhost" or the IP addresses associated with "localhost", but this is fragile. On machines where a reverse lookup on 127.0.0.1 returns a string other than localhost, the test fails, like in the following example: ``` >_ jdb -connect com.sun.jdi.SocketListen:port=50000 Listening at address: kubernetes.docker.internal:50000 ... >_ make test TEST=.../startlis001/TestDescription.java ... Test case #1: start listening the address kubernetes.docker.internal:49532 Expected addresses: localhost:null or 127.0.0.1:null or 0:0:0:0:0:0:0:1:null ... ``` As a workaround, this patch uses `InetAddress.isLoopbackAddress()` on the hostname portion of the address that is being listened. Validated this patch on machines where the reverse lookup resolves to either "localhost" or a different string.
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