mockStatic fails with class redefinition failed: invalid class #3273
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Description
Mockito message in the stack trace:
java.lang.InternalError: class redefinition failed: invalid class
at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:167)
at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.triggerRetransformation(InlineBytecodeGenerator.java:281)
at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.mockClassStatic(InlineBytecodeGenerator.java:226)
at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.mockClassStatic(TypeCachingBytecodeGenerator.java:108)
at org.mockito.internal.creation.bytebuddy.InlineDelegateByteBuddyMockMaker.createStaticMock(InlineDelegateByteBuddyMockMaker.java:592)
at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.createStaticMock(InlineByteBuddyMockMaker.java:83)
at org.mockito.internal.util.MockUtil.createStaticMock(MockUtil.java:202)
at org.mockito.internal.MockitoCore.mockStatic(MockitoCore.java:134)
at org.mockito.Mockito.mockStatic(Mockito.java:2328)
at org.mockito.Mockito.mockStatic(Mockito.java:2265)
at <line of try block in test method>
The problematic class belongs to the Thales JCPROV library which is unfortunately not available on Maven Central so I cannot compose a reproducer.
However, I can describe its characteristics:
- Public, top level and non-final
- With a default constructor that is private and does nothing
- With public methods that are all static and native
- With a static initialization block that loads a native library via
System.loadLibrary
As the native library is not available during test execution (and I cannot make it available), I would guess that the failure in the static block triggers the exception above. However, I don't know how to prove it.
Is there anything I could do to properly mock such a class? Otherwise, do you see any possible improvements in Mockito for these cases?
Please, let me know in case I could grab additional details to help the analysis.
The issue happens on Mockito 5.10.0 and OpenJDK 11.0.12.
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