The jaxb-api 2.3.0 library has a dependency on the java.activation module, which has been removed from JDK 11. The dependency is declared in module-info.java but not in pom.xml:
http://search.maven.org/#artifactdetails%7Cjavax.xml.bind%7Cjaxb-api%7C2.3.0%7Cjar
It should be declared there as well, so clients of the jaxb-api don't have to discover this dependency at runtime due to NoClassDefFoundError