prepare java decoder for transpilation to Kotlin #623

Job	Run time
Build and test cmake:gcc9	26s
Build and test cmake:clang15	33s
Build and test cmake:clang15:asan	46s
Build and test cmake:clang15:tsan	44s
Build and test cmake:clang15:ubsan	50s
Build and test cmake:qemu-arm-neon-gcc	1m 3s
Build and test cmake-osx:clang	37s
Build and test cmake-osx:gcc	49s
Build and test cmake-win64:msvc-rel	1m 26s
Build and test cmake-win64:msvc-dbg	57s
Build and test fuzz:clang15	36s
Build and test python3.10:clang15	1m 42s
Build and test python3.10-win	38s
Build and test maven	22s
Build and test bazel:root	34s
Build and test bazel:go	1m 8s
Build and test bazel:java	1m 48s
Build and test bazel:research	26s
Build and test bazel-osx:root	1m 43s
Build and test bazel-osx:go	2m 8s
Build and test bazel-osx:java	2m 42s
Build and test bazel-osx:research	1m 10s
Build and test bazel-win:root	2m 2s
Build and test bazel-win:java	3m 55s
Build and test bazel-win:research	1m 41s
	30m 46s

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