further simplify Java build #608

Job	Run time
Build and test cmake:gcc9	28s
Build and test cmake:clang15	29s
Build and test cmake:clang15:asan	46s
Build and test cmake:clang15:tsan	42s
Build and test cmake:clang15:ubsan	52s
Build and test cmake:qemu-arm-neon-gcc	59s
Build and test cmake-osx:clang	36s
Build and test cmake-osx:gcc	36s
Build and test cmake-win64:msvc-rel	1m 23s
Build and test cmake-win64:msvc-dbg	42s
Build and test fuzz:clang15	33s
Build and test python3.10:clang15	1m 46s
Build and test python3.10-win	35s
Build and test maven	39s
Build and test bazel:root	29s
Build and test bazel:go	1m 6s
Build and test bazel:java	1m 48s
Build and test bazel:research	26s
Build and test bazel-osx:root	1m 41s
Build and test bazel-osx:go	2m 50s
Build and test bazel-osx:java	7m 13s
Build and test bazel-osx:research	1m 37s
Build and test bazel-win:root	1m 46s
Build and test bazel-win:java	4m 5s
Build and test bazel-win:research	1m 27s
	35m 34s

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