wsgen and wsimport tools use the utility classes in java.xml.bind module to localize messages. Resource bundles are encapsulated in named modules and hence utility like com.sun.istack.internal.localization.LocalizableMessageFactory.
The owner of the resource bundle should be the one loading ResourceBundle. The solution to this type of issue is to update the utility classes to accept a function to return ResourceBundle rather than by base name. Another alternative could do the localization locally within the module and this may not be applicable to JAX-WS since jdk.xml.ws is tightly coupled with java.xml.ws. Webrev at: http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8153944/webrev.00 This patch touches quites a few files, one per supporting class to get messages from one resource bundle. The change is straight-forward and same pattern applies to each message file. Mandy