I've found the cause and fixed it.   The reason is I was using JDK 13 which has removed the library  JAXB-API.  After I downgrade JDK from 13 to 8 with below command sudo apt install openjdk-8-jre-headless   It works. Don't forget to reset Java_Home environment variable.   Ps: don't forget to open port of nifi-registry Hope it is helpful to someone.   ... View more