fix #321

Job	Run time
Run examples in 'session-example' on MySQL	2m 3s
Test with Java 17	3m 8s
Run examples in 'session-example' on PostgreSQL	1m 57s
Test with MariaDB	3m 28s
Test with Java 20	3m 11s
Run examples in 'native-sql-example' on PostgreSQL	1m 50s
Test with MySQL	4m 3s
Test with Java 21	3m 9s
Test with PostgreSQL	3m 10s
Test with Java 23	3m 6s
Test with MSSQLServer	3m 32s
Test with CockroachDB	5m 40s
Test with Db2	5m 15s
Test with Oracle	4m 32s
Test with Java 24-ea	3m 7s
	51m 11s

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