While running a popular benchmark with b118, I got:

Exception in thread "main" java.lang.NoClassDefFoundError:
javax/xml/bind/JAXBException

due to new Jigsaw modulariazation changes. I would expect that the module would be javax.xml.bind, so I tried

-addmods javax.xml.bind

but actually the module is:

-addmods java.xml.bind

This seems like bad usability, the javax.* classes have been in java for many years, why change the name of it in Jigsaw?
To me this is a bug unless there is good documentation or a better error message for javax vs java.