CI fails on Linux JDK 17: Mockito state corrupted by mock(Method.class) in WinRMInvocationHandlerTest #84

Summary

Maven tests pass locally on Windows with JDK 17 but fail in GitHub Actions on Linux with JDK 17. Two tests fail with Mockito-related errors:

• WinRMCommandExecutorTest.testExecute — NullPointerException: Cannot invoke "[Ljava.lang.Class;.clone()" because "parameterTypes" is null
• WinRMWqlExecutorTest.testExecute — InvalidUseOfMatchersException (cascading failure)

This is not a Java version mismatch. CI and local both use JDK 17.

Root cause

WinRMInvocationHandlerTest uses a static mock of java.lang.reflect.Method:

private static final Method METHOD = mock(Method.class);

Mocking core JDK reflection types breaks Mockito's own reflection internals (mockito#2026). After this mock is created, later stubbing of methods such as executeCommand(...) can fail with a NullPointerException on Method.getParameterTypes().

The InvalidUseOfMatchersException in WinRMWqlExecutorTest is a secondary effect of polluted Mockito matcher state, not a separate bug in that test.

Why it passes locally but fails in CI

Surefire test execution order is filesystem-dependent:

Proposed fix

1. WinRMInvocationHandlerTest — Remove mock(Method.class). Use a real WinRMWebService.receive Method and stub WIN_RM_WS.receive(...) instead of Method.invoke(...).

2. WinRMCommandExecutorTest — In the SMB/file-copy path, mock WinRMService (concrete class) instead of the WindowsRemoteExecutor interface, and use eq(UTF_8) instead of any(Charset.class) for consistency with the other test branch.

Acceptance criteria

• mvn test passes on Linux CI with JDK 17
• Tests pass regardless of Surefire execution order (e.g. -Dtest=WinRMInvocationHandlerTest,WinRMCommandExecutorTest,WinRMWqlExecutorTest)
• No mocking of java.lang.reflect.Method or other core JDK reflection types in tests

References

• Mockito issue: NullPointerException in java.lang.reflect.Method.getParameterTypes mockito/mockito#2026
• Affected tests: WinRMInvocationHandlerTest, WinRMCommandExecutorTest, WinRMWqlExecutorTest