SQLInvalidAuthorizationSpecException in TestMultiThreadedKernel

An unusual random failure in current master on Java 10:

13:52:01 00:00.001 org.h2.test.db.TestMultiThreadedKernel FAIL org.h2.jdbc.JdbcSQLInvalidAuthorizationSpecException: Wrong user name or password [28000-197]
ERROR: FAIL (mvStore AES SOFT_LRU diskUndo diskResult traceLevelFile throttle:1 ) org.h2.jdbc.JdbcSQLInvalidAuthorizationSpecException: Wrong user name or password [28000-197] org.h2.jdbc.JdbcSQLInvalidAuthorizationSpecException: Wrong user name or password [28000-197] ------------------------------
org.h2.jdbc.JdbcSQLInvalidAuthorizationSpecException: Wrong user name or password [28000-197]
	at org.h2.message.DbException.getJdbcSQLException(DbException.java:456)
	at org.h2.message.DbException.getJdbcSQLException(DbException.java:425)
	at org.h2.message.DbException.get(DbException.java:203)
	at org.h2.message.DbException.get(DbException.java:179)
	at org.h2.message.DbException.get(DbException.java:168)
	at org.h2.engine.Engine.validateUserAndPassword(Engine.java:362)
	at org.h2.engine.Engine.createSessionAndValidate(Engine.java:186)
	at org.h2.engine.Engine.createSession(Engine.java:161)
	at org.h2.engine.Engine.createSession(Engine.java:31)
	at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:336)
	at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:123)
	at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:102)
	at org.h2.Driver.connect(Driver.java:69)
	at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)
	at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
	at org.h2.test.db.TestMultiThreadedKernel.testConcurrentRead(TestMultiThreadedKernel.java:106)
	at org.h2.test.db.TestMultiThreadedKernel.test(TestMultiThreadedKernel.java:48)
	at org.h2.test.TestBase.runTest(TestBase.java:139)
	at org.h2.test.TestAll.addTest(TestAll.java:1018)
	at org.h2.test.TestAll.test(TestAll.java:770)
	at org.h2.test.TestAll.runTests(TestAll.java:665)
	at org.h2.test.TestAll.testAll(TestAll.java:556)
	at org.h2.test.TestAll.run(TestAll.java:506)
	at org.h2.test.TestAll.main(TestAll.java:447)

Start with org/h2/test/db/TestMultiThreadedKernel.java, especially testConcurrentRead at line 106, and inspect the connection setup around the reported failure. Reproduce the Java 10 failure if possible; done means the intermittent SQLInvalidAuthorizationSpecException is explained and the test runs reliably without false authentication failures.