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Is java bytecode always compatible with conversion?

I understand that the bytecode generated by the JDK X version is guaranteed to run on JVM Y if Y> = X.

Is this supported for all versions of the JDK / JVM? Is it fair to expect class files created by JDK 1 to work in JVM 11?

Refers to JVM Specification , JDK 8 and Java 11 JSR Compatibility Guide Could not find an exact answer.

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Bytecode should work in future versions. This is still true, but no one knows if this will be true for the whole future.

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Source: https://habr.com/ru/post/1695231/

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