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Well the specification explicitly talks about version 54 class files, which it then goes on to state "Version 54.1 class files are intended to be supported only by implementations of Java SE 10.". It's not going to land with Java SE 9.

With all the prolonged delays of features in Java, whether it is Java 10, 11, or 12 is still in question. As an instance, Jigsaw was proposed to be a driving feature of Java 7, and then delayed to Java 8 and even Java 9. And recently it was voted "No" by IBM, Red Hat etc.

Sure, features slip, but value types are coming in java 10 until they aren't.

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