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 07:14:28,87 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state disabled 07:14:28,91 PM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 07:14:28,103 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library cleaned successfully 07:14:28,104 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer stopped 07:14:28,159 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state enabled 07:14:28,159 PM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 07:14:28,160 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library cleaned successfully 07:14:28,160 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer stopped 07:14:29,363 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library writer starting update to 1 07:14:29,364 PM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 07:14:29,373 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library updated successfully 07:14:29,373 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state disabled 07:14:29,479 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library writer starting update to 1 07:14:29,480 PM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 07:14:29,482 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library updated successfully 07:14:29,482 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state enabled 07:14:29,563 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library writer starting update to 1 07:14:29,563 PM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 07:14:29,565 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library updated successfully 07:14:29,565 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state disabled 07:14:29,642 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library writer starting update to 1 07:14:29,642 PM [main] [DEBUG] YangLibraryWriter - Allocated new transaction chain 07:14:29,643 PM [main] [DEBUG] YangLibraryWriter - ietf-yang-library updated successfully 07:14:29,644 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state enabled 07:14:29,655 PM [main] [WARN] YangLibraryWriter - ietf-yang-library not present in context, skipping update 07:14:29,655 PM [main] [INFO] YangLibraryWriter - ietf-yang-library writer started with modules-state disabled