cvm/overlay: Fix whitebox isclassalive mismatch#138
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duanyangjing merged 2 commits intoMay 20, 2026
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In JDK 17 hotspot, the native method isClassAlive0(String) returning boolean was replaced by countAliveClasses0(String) returning int. The JDK 8 WhiteBox test library still declares the old isClassAlive0 native signature, which causes an UnsatisfiedLinkError at runtime when running on the JDK 17 kernel. This overlay adapts the WhiteBox class to call countAliveClasses0 and compare the result against zero, preserving the same boolean isClassAlive(String) public API contract expected by all ClassUnload and class_unloading test cases.
superajun-wsj
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May 20, 2026
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Based on JDK 8 baseline, this PR fixes the compatibility issue where the JDK 17 HotSpot native method isClassAlive0 has been changed to countAliveClasses0. The JDK 8 WhiteBox library's isClassAlive0 signature would cause an UnsatisfiedLinkError on a JDK 17 kernel.
This fix enables 9 class unloading related test cases to pass successfully on CompoundVM.