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Cleaned up some nullability warnings #1440

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Job	Run time
Test JDK 8, ubuntu-latest	1m 24s
Test JDK 8, ubuntu-latest	1m 24s
Test JDK 17, ubuntu-latest	1m 28s
Test JDK 17, ubuntu-latest	1m 28s
Test JDK 21, ubuntu-latest	1m 29s
Test JDK 21, ubuntu-latest	1m 29s
Test JDK 8, windows-latest	2m 3s
Test JDK 8, windows-latest	1m 46s
Test JDK 17, windows-latest	2m 49s
Test JDK 17, windows-latest	2m 49s
Test JDK 21, windows-latest	1m 49s
Test JDK 21, windows-latest	1m 49s
Test JDK 8, macOS-latest	1m 42s
Test JDK 8, macOS-latest	1m 42s
Test JDK 17, macOS-latest	1m 31s
Test JDK 17, macOS-latest	1m 31s
Test JDK 21, macOS-latest	1m 29s
Test JDK 21, macOS-latest	1m 29s
	31m 11s