But another thing that's really strange is if I do a return client.target(...).path("md5").request() .post(Entity.json(paths)).readEntity(new GenericType<Map<Path, String>>() { }); (where paths is a Collection<Path>) I see my PathAdapter being hit on the way out but not when parsing the result. Furthermore, I get my Map<Path, String> but the keys are somehow Strings. Don't ask me how that works syntactically with the key being a Path. The compiler is fine with me using them as paths until I actually try to call path methods on it, then they go all ClassCastException on me. On Thu, Mar 14, 2019 at 6:35 PM Nicklas Karlsson <nickarls(a)gmail.com <mailto:nickarls@gmail.com>> wrote: Thanks for the reply, I'll see if I can distill it down. I actually got it working by explicitly registering the provider with the client builder (did it wrong the first time). I checked with the debugger and the ClientBuilder apparently holds provider factories that *sound* like their job would be picking up the ContextResolver but I get by for now. As a curiosity, register(Object) only worked for me when I instantiated the ContextResolver with new(), apparently it's an CDI injectable resource but passing along that instance resulted in some sort of ArrayIndexOutBoundsException. On Thu, Mar 14, 2019 at 5:21 PM Marek Kopecky <mkopecky(a)redhat.com <mailto:mkopecky@redhat.com>> wrote: Hi Nicklas, can you please provide a reproducer? (zip file with minimal example of this issue). Thank you, Marek On 3/14/19 11:45 AM, Nicklas Karlsson wrote: > Hi, > >   I'm trying out the RESTEasy client on a WildFly 16 and I'm > running into a serialization problem. I have a CDI @Provider > for ContextResolver<Jsonb> but when using the client with > some non-standard Objects (Adapters registered in the > Jsonb-provider), I never see the provider hit and I get > exception like > > Caused by: java.lang.IllegalAccessException: Class > org.eclipse.yasson.internal.model.GetFromGetter can not > access a member of class sun.nio.fs.WindowsPath with > modifiers "public" and > Caused by: javax.ws.rs.ProcessingException: RESTEASY008205: > JSON Binding serialization error > javax.json.bind.JsonbException: Error getting value on: > foo.txt and > Caused by: javax.json.bind.JsonbException: Error getting > value on: yep.fmb12:36:19,331 at > org.eclipse.yasson.internal.model.GetValueCommand.getValue(GetValueCommand.java:36) > > and the likes which could be expected from a best-guess > attempt at serializing a java.nio.file.Path instead of using > the Adapter. > > I've also tried registering the provider directly in the > client builder but still no go? What is the correct way of > hooking up JSON-B serialization? > > Thanks in advance, >   Nik > > -- > Nicklas Karlsson, +358 40 5062266 > Vaakunatie 10 as 7, 20780 Kaarina > > _______________________________________________ > resteasy mailing list > resteasy(a)lists.jboss.org <mailto:resteasy@lists.jboss.org> > https://lists.jboss.org/mailman/listinfo/resteasy -- Nicklas Karlsson, +358 40 5062266 Vaakunatie 10 as 7, 20780 Kaarina -- Nicklas Karlsson, +358 40 5062266 Vaakunatie 10 as 7, 20780 Kaarina