Merge pull request #62 from yegortokmakov/patch-1 #67

Job	Run time
ci / jdk-11 travis	1m 19s
integration_test / jdk-11 mysql2	4m 19s
integration_test / jdk-11 postgresql	2m 16s
ci / verify	1m 24s
ci / jdk-11 travis	2s
ci / jdk-11 mysql	1m 18s
ci / jdk-11 postgresql	3m 27s
ci / jdk-17 travis	3m 27s
ci / jdk-17 mysql	1m 28s
ci / jdk-17 postgresql	1m 41s
	20m 41s

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