further simplify Java build #607

Job	Run time
Build and test cmake:gcc9	28s
Build and test cmake:clang15	31s
Build and test cmake:clang15:asan	44s
Build and test cmake:clang15:tsan	48s
Build and test cmake:clang15:ubsan	53s
Build and test cmake:qemu-arm-neon-gcc	55s
Build and test cmake-osx:clang	56s
Build and test cmake-osx:gcc	1m 10s
Build and test cmake-win64:msvc-rel	1m 27s
Build and test cmake-win64:msvc-dbg	1m 4s
Build and test fuzz:clang15	29s
Build and test python3.10:clang15	1m 43s
Build and test python3.10-win	38s
Build and test maven	29s
Build and test bazel:root	27s
Build and test bazel:go	1m 12s
Build and test bazel:java	1m 50s
Build and test bazel:research	27s
Build and test bazel-osx:root	1m 41s
Build and test bazel-osx:go	1m 53s
Build and test bazel-osx:java	2m 53s
Build and test bazel-osx:research	1m 20s
Build and test bazel-win:root	1m 30s
Build and test bazel-win:java	4m 18s
Build and test bazel-win:research	2m 0s
	31m 46s

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