Mockito is currently self-attaching to enable the inline-mock-maker. This will no longer work in future releases of the JDK. Please add Mockito as an agent to your build what is described in Mockito's documentation: https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#0.3 WARNING: A Java agent has been loaded dynamically (/tmp/r/net/bytebuddy/byte-buddy-agent/1.15.4/byte-buddy-agent-1.15.4.jar) WARNING: If a serviceability tool is in use, please run with -XX:+EnableDynamicAgentLoading to hide this warning WARNING: If a serviceability tool is not in use, please run with -Djdk.instrument.traceUsage for more information WARNING: Dynamic loading of agents will be disallowed by default in a future release 10:50:20,880 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state disabled 10:50:20,884 AM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 10:50:20,897 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library cleaned successfully 10:50:20,897 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer stopped 10:50:20,953 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state enabled 10:50:20,953 AM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 10:50:20,954 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library cleaned successfully 10:50:20,955 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer stopped 10:50:22,173 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library writer starting update to 1 10:50:22,173 AM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 10:50:22,181 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library updated successfully 10:50:22,182 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state disabled 10:50:22,281 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library writer starting update to 1 10:50:22,281 AM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 10:50:22,283 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library updated successfully 10:50:22,283 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state enabled 10:50:22,365 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library writer starting update to 1 10:50:22,365 AM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 10:50:22,367 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library updated successfully 10:50:22,367 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state disabled 10:50:22,440 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library writer starting update to 1 10:50:22,440 AM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 10:50:22,442 AM [main] [DEBUG] YangLibraryWriter - ietf-yang-library updated successfully 10:50:22,442 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state enabled 10:50:22,453 AM [main] [WARN] YangLibraryWriter - ietf-yang-library not present in context, skipping update 10:50:22,453 AM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state disabled