Spring Boot application breaks after upgrade to Apache Derby 10.15 -- why?

During a round of SOUP upgrades in a Spring Boot application, I bumped Apache Derby from 10.14.1.0 to 10.15.1.3. Now the tests fail with this beauty (snipped, full stacktrace here):

Failed to load ApplicationContext
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: 
    Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration': 
        Unsatisfied dependency expressed through constructor parameter 0
Caused by: org.springframework.beans.factory.BeanCreationException: 
    Error creating bean with name 'dataSource': 
        Invocation of init method failed
Caused by: java.lang.IllegalStateException: 
    Failed to replace DataSource with an embedded database for tests. 
    If you want an embedded database please put a supported one on the 
    classpath or tune the replace attribute of @AutoConfigureTestDatabase.

What is going here? Do I need to change any configuration?

Solution

Apache Derby requires Java 9 from 10.15.x on which Spring Boot does currently not support.