lsp-java: Changes for NixOS #172

Job	Run time
test (ubuntu-latest, 26.3)	1m 47s
test (ubuntu-latest, 27.2)	1m 45s
test (ubuntu-latest, 28.2)	2m 13s
test (ubuntu-latest, snapshot)	1m 38s
test (macos-latest, 26.3)	4m 20s
test (macos-latest, 27.2)	3m 52s
test (macos-latest, 28.2)	4m 5s
test (macos-latest, snapshot)	3m 19s
test (windows-latest, 26.3)	3m 17s
test (windows-latest, 27.2)	2m 0s
test (windows-latest, 28.2)	2m 20s
test (windows-latest, snapshot)	1m 0s
	31m 36s

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