When running with Jigsaw b162 with --permit-illegal-access, the following warnings are printed from the standalone jar.
WARNING: Illegal access by com.sun.xml.ws.model.Injector (file:files-2.1/com.sun.xml.ws/jaxws-rt/2.3.0-b170309.1503/jaxws-rt-2.3.0-b170309.1503.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int)
WARNING: Illegal access by com.sun.xml.ws.model.Injector (file:files-2.1/com.sun.xml.ws/jaxws-rt/2.3.0-b170309.1503/jaxws-rt-2.3.0-b170309.1503.jar) to method java.lang.ClassLoader.definePackage(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.net.URL)
WARNING: Illegal access by com.sun.xml.ws.model.Injector (file:files-2.1/com.sun.xml.ws/jaxws-rt/2.3.0-b170309.1503/jaxws-rt-2.3.0-b170309.1503.jar) to method java.lang.ClassLoader.getPackage(java.lang.String)
WARNING: Illegal access by com.sun.xml.ws.model.Injector (file:files-2.1/com.sun.xml.ws/jaxws-rt/2.3.0-b170309.1503/jaxws-rt-2.3.0-b170309.1503.jar) to method java.lang.ClassLoader.resolveClass(java.lang.Class)
If these have fall-back code if the access fails, let me know and I'll track known safe occurrences.