Jersey Client API Problem

Question

I am writing an Android client which calls a web service. The service is written using JAX-RS / Jersey API. I'm also trying to use Jersey-Client API on the android side.

        Client client = Client.create();
        WebResource webResource = client.resource(server + "/api/restaurant_info/update");
        MultivaluedMap formData = new MultivaluedMapImpl();
        formData.add("id", id);
        formData.add("f", Boolean.toString(f));
        formData.add("fId", fId);
        ClientResponse response = webResource.type(MediaType.APPLICATION_FORM_URLENCODED).accept(MediaType.APPLICATION_JSON).post(ClientResponse.class, formData);
        RestInfo restInfo = response.getEntity(RestInfo.class);
        return restInfo;

I have tested the web service externally, and it seems to be working fine. When I try to call it from within my application, I'm getting a NullPointerException at the ClientResponse line.

03-26 14:15:43.735: WARN/System.err(1060): java.lang.NullPointerException
03-26 14:15:43.745: WARN/System.err(1060):     at javax.ws.rs.core.MediaType.valueOf(MediaType.java:119)
03-26 14:15:43.745: WARN/System.err(1060):     at com.sun.jersey.api.client.PartialRequestBuilder.type(PartialRequestBuilder.java:92)
03-26 14:15:43.755: WARN/System.err(1060):     at com.sun.jersey.api.client.WebResource.type(WebResource.java:309)
03-26 14:15:43.755: WARN/System.err(1060):     at com.era.external.era.ERAService.updateRestaurantFranchise(ERAService.java:80)
03-26 14:15:43.755: WARN/System.err(1060):     at com.era.android.RestaurantActivity$4.onItemSelected(RestaurantActivity.java:201)
03-26 14:15:43.755: WARN/System.err(1060):     at android.widget.AdapterView.fireOnSelected(AdapterView.java:856)
03-26 14:15:43.766: WARN/System.err(1060):     at android.widget.AdapterView.access$200(AdapterView.java:41)
03-26 14:15:43.766: WARN/System.err(1060):     at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:827)
03-26 14:15:43.776: WARN/System.err(1060):     at android.os.Handler.handleCallback(Handler.java:587)
03-26 14:15:43.776: WARN/System.err(1060):     at android.os.Handler.dispatchMessage(Handler.java:92)
03-26 14:15:43.776: WARN/System.err(1060):     at android.os.Looper.loop(Looper.java:123)
03-26 14:15:43.786: WARN/System.err(1060):     at android.app.ActivityThread.main(ActivityThread.java:3948)
03-26 14:15:43.786: WARN/System.err(1060):     at java.lang.reflect.Method.invokeNative(Native Method)
03-26 14:15:43.796: WARN/System.err(1060):     at java.lang.reflect.Method.invoke(Method.java:521)
03-26 14:15:43.796: WARN/System.err(1060):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
03-26 14:15:43.796: WARN/System.err(1060):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
03-26 14:15:43.806: WARN/System.err(1060):     at dalvik.system.NativeStart.main(Native Method)

Any ideas on what I'm doing wrong?

Did you look at what's on line 119 of MediaType.java? – Tyler Jun 15 '11 at 20:32 — Tyler, Jun 15 '11 at 20:32
any luck on this one? i am facing the exact same problem. – necromancer Dec 20 '11 at 20:29 — necromancer, Dec 20 '11 at 20:29
Any Luck? I am also stuck.. :( – Himanshu Virmani Mar 14 '13 at 14:03 — Himanshu Virmani, Mar 14 '13 at 14:03

score 0 · Answer 1 · answered Nov 06 '13 at 18:27

I am also a Jersey newbie, but I think that the reason your post code does not work is that formData must be in one of the types accepted. I'm not totally sure on the difference between the type and the accept commands in this contexts, but I am pretty sure that formData must be of one of the types that your invocation builder supports. E.g. if you serialised formData as a JSON object and set type/accept to JSON then this code would work. As it is it is probably calling some bodymethodwriter to serialise it into an acceptable type but formData doesnt have one so the method call returns null. In fact, it looks like its calling ValueOf to try to obtain the data out of formData for serialisation, but that returns null.

score 0 · Answer 2 · answered Apr 06 '11 at 22:00

0

Judging by the stack trace, it's probably something happing at either

ERAService line 80 in the updateRestaurantFranchise method
RestaurantActivity line 201 in the onItemSelected method

answered Apr 06 '11 at 22:00

Chris Salij

3,096
5
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score 0 · Answer 3 · answered May 31 '11 at 11:51

0

Android has Dalvik Virtual Machine, not original JVM. I think this the reason why Jersey Client API does not work in Android OS. but I'am nog sure!

answered May 31 '11 at 11:51

Xiabili

486
5
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The Dalvik VM is byte-code compatible with the JVM, you would see an exception or system error in line with a byte code problem if the compatibility of the Jersey API JARs were the issue, they are not. The problem is elsewhere. – Riyad Kalla Sep 15 '11 at 18:27

Jersey Client API Problem

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