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QJniObject is not prepared for being subclassed (no virtual destructor), and doing so is formally UB. Instead of making QJniArray(Base) a QJniObject subclass, give it a QJniObject member and make it convertible to/from QJniObject. Existing code still works with this change, even though it removes all the inherited QJniObject APIs for accessing fields and methods. However, as the Java array classes have a very narrow and well-defined API anyway we could, if needed, add those as C++ member functions instead of going through calling-by-string. Found during API review. Task-number: QTBUG-119952 Change-Id: Ic4437116eed5e15226449bdabe48ab657cb14dc3 Reviewed-by: Marc Mutz <marc.mutz@qt.io> (cherry picked from commit 101ab278913e3bacc7c0596ae0a5bf3c0fa2f922) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>