SessionAwareSemaphoreBasicTest.testNoDuplicateRelease_whenSessionExpires fails with Cannot invoke "java.lang.invoke.MethodHandle.invokeExact about hazelcast

[JackPGreen]

com.hazelcast.cp.internal.datastructures.spi.blocking.AbstractBlockingService.heartbeatSession(AbstractBlockingService.java:311)

That's just a string concatenation:

hazelcast/hazelcast/src/main/java/com/hazelcast/cp/internal/datastructures/spi/blocking/AbstractBlockingService.java

Line 311 in db1ce19

throw new SessionExpiredException("active session: " + sessionId + " does not exist in " + groupId);

Even concatenating null doesn't cause a NullPointerException. I've looked in the openj9 source of StringConcatHelper#stringOf and don't see any method handle usage so I'm guessing this is some kind of JDK/JIT optimization issue. There's a similar previous issue that validates this feeling.

The full stack trace isn't much more helpful, either:

java.lang.NullPointerException: null
	at java.base/java.lang.StringConcatHelper.stringOf(StringConcatHelper.java) ~[?:?]
	at com.hazelcast.cp.internal.datastructures.spi.blocking.AbstractBlockingService.heartbeatSession(AbstractBlockingService.java:311) ~[classes/:?]

Closing to see if happens again...