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It looks like that CustomAccessible class is part of some test suite - I was unable to find it in JDK source code. CAccessibility class is trying to invoke getAccessibleAction on this custom test class and it has a stub in CustomAccessible$CustomAccessibleAC.getAccessibleAction that simply throws runtime exception, like:
throw new RuntimeException( "Not implemented" );
The test code needs to be examined first to understand if it is a JDK problem.