Java: Add examples to missing commands and minor fixes Generic Comman… #769

Job	Run time
build-amazonlinux-latest	0s
lint-rust	3m 57s
build-and-test-java-client (11, 6.2.14, ubuntu-latest)	4m 55s
build-and-test-java-client (11, 6.2.14, macos-latest)	7m 46s
build-and-test-java-client (11, 7.2.3, ubuntu-latest)	5m 39s
build-and-test-java-client (11, 7.2.3, macos-latest)	8m 9s
build-and-test-java-client (17, 6.2.14, ubuntu-latest)	5m 20s
build-and-test-java-client (17, 6.2.14, macos-latest)	6m 49s
build-and-test-java-client (17, 7.2.3, ubuntu-latest)	4m 45s
build-and-test-java-client (17, 7.2.3, macos-latest)	10m 12s
	57m 32s

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