prepare java decoder for transpilation to Kotlin #622

Job	Run time
Build and test cmake:gcc9	27s
Build and test cmake:clang15	35s
Build and test cmake:clang15:asan	44s
Build and test cmake:clang15:tsan	47s
Build and test cmake:clang15:ubsan	47s
Build and test cmake:qemu-arm-neon-gcc	57s
Build and test cmake-osx:clang	42s
Build and test cmake-osx:gcc	44s
Build and test cmake-win64:msvc-rel	1m 31s
Build and test cmake-win64:msvc-dbg	1m 15s
Build and test fuzz:clang15	28s
Build and test python3.10:clang15	1m 45s
Build and test python3.10-win	1m 19s
Build and test maven	25s
Build and test bazel:root	35s
Build and test bazel:go	1m 7s
Build and test bazel:java	1m 52s
Build and test bazel:research	30s
Build and test bazel-osx:root	1m 16s
Build and test bazel-osx:go	3m 23s
Build and test bazel-osx:java	5m 26s
Build and test bazel-osx:research	1m 7s
Build and test bazel-win:root	1m 33s
Build and test bazel-win:java	4m 42s
Build and test bazel-win:research	1m 44s
	35m 41s

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