Verify class compatibility before attempting cast #1435
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Rework #1427 due to goofy merge shenanigans.
There was a case in the field on an IBM J9 JVM, where an instance returned from
ManagementFactory.getThreadMXBean()could not be cast safely to thecom.sun.management.ThreadMXBean, even thought that class can be found on the classpath.It looks like other implementations have also encountered this, and so this fix is inspired by those other workarounds.