Support IPV6_ADDR_PREFERENCES until Java 24 and beyond #1007
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While reflection on Java's internals is slowly being crippled, Unsafe access is still possible (at least until JEP 417 [0] reaches phase 3 in Java 26 or later). This requires moving from DatagramSocket to DatagramChannel as the former is substantially rewritten in Java 15 (JEP 373, see [1]) as a wrapper around the latter. The channel-based socket cannot be used in Java versions prior to 14 due to Java bug JDK-8232673 [2] which prevents read/write concurrency, effectively stalling the node. Tested on OpenJDK 8, 11, 17, 21, 23, and 24. Fixes bug 07217. [0] https://openjdk.org/jeps/471 [1] https://openjdk.org/jeps/373 [2] https://bugs.openjdk.org/browse/JDK-8232673
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While reflection on Java's internals is slowly being crippled, Unsafe access is still possible (at least until JEP 417 [0] reaches phase 3 in Java 26 or later).
This requires moving from DatagramSocket to DatagramChannel as the former is substantially rewritten in Java 15 (JEP 373, see [1]) as a wrapper around the latter. The channel-based socket cannot be used in Java versions prior to 14 due to Java bug JDK-8232673 [2] which prevents read/write concurrency, effectively stalling the node.
Tested on OpenJDK 8, 11, 17, 21, 23, and 24.
Fixes bug 07217.
[0] https://openjdk.org/jeps/471
[1] https://openjdk.org/jeps/373
[2] https://bugs.openjdk.org/browse/JDK-8232673