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  1. JDK
  2. JDK-8233296

MulticastSocket getOption/setOption inverts the value of IP_MULTICAST_LOOP

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    • Subcomponent:
    • Resolved In Build:
      b25
    • Verification:
      Verified

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        MulticastSocket has two ways to report whether loopback of multicast datagrams is enabled or disabled:

        1. Legacy getLoopbackMode(), should return true when loopback is disabled.

        2. getOption(IP_MULTICAST_LOOP), should return true when loopback is enabled.

        We seem to have a bug with #2 in that it returns true when the loopback is disabled. These methods should always return the inverse of one another.

        The setOption/getOption methods are @since 9 so the compatibility impact of fixing this is probably low.

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                • Assignee:
                  dfuchs Daniel Fuchs
                  Reporter:
                  alanb Alan Bateman
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