The issue seems to be due to the error documented in the Registry Admin Guide (https://nifi.apache.org/docs/nifi-registry-docs/html/administration-guide.html#system-requirements) if you don't have a JDK installed:   When running Registry with only a JRE you may encounter the following error as Flyway (database migration tool) attempts to utilize a resource from the JDK:   java.lang.RuntimeException: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flywayInitializer' defined in class path resource [org/springframework/boot/autoconfigure/flyway/FlywayAutoConfiguration$FlywayConfiguration.class]: Invocation of init method failed; nested exception is org.flywaydb.core.api.FlywayException: Validate failed: Detected failed migration to version 1.3 (DropBucketItemNameUniqueness)   Try installing the  JDK , deleting the `database` directory that was created prior and then start the Registry. ... View more