Java CI with Maven

remove Optional since buildClassFrom always finds a class #2791

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Run time

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Job	Run time
Compilation	2m 30s
JDK9	57s
JDK8	10m 45s
IntegrationTest	9m 55s
publish-javadoc	0s
Style	45s
CoverageReport	1m 0s
	25m 52s