Java 9 deprecated six modules that contain Java EE APIs and they are going to be removed soon:
javax.activation pack
I have experimented with most of the suggestions described above using JDK 11.0.3 and have been not been successful. The only solution that I eventually found to work is the following. Perhaps there are other options that also work but it appears that the selection of version is critical. For example, changing com.sun.xml.ws:rt to 2.3.2 causes module javax.jws to no long be available.
org.glassfish.jaxb
jaxb-runtime
2.4.0-b180830.0438
com.sun.xml.ws
rt
2.3.1