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I am trying to create a simple Android client for a web service I have built, but something goes wrong at runtime. Here is the Client: public class MyClient extends AsyncTask<EditText, Integer, String> { private EditText text; protected String doInBackground(EditText... strings) { RuntimeDelegate .setInstance(new com.sun.ws.rs.ext.RuntimeDelegateImpl()); WebResource wbr; Client client = Client.create(); wbr = client .resource("http://my.ip:8080/MazeService/rest/service/hello"); String result = wbr.queryParam("number", "10") .accept(MediaType.APPLICATION_JSON).get(String.class); text = strings[0]; return result; } protected void onProgressUpdate(Integer... progress) { // setProgressPercent(progress[0]); } protected void onPostExecute(String result) { if (result != null) this.text.setText(result); else Log.d("MyApp", "No Result"); } } and the Service: @Path("/service") public class AndroidService { @GET @Produces(MediaType.APPLICATION_JSON ) @Path("/hello") public String getJSON(@QueryParam("number") String nr) { String s = "Hi there! The number is: "+nr; return s; } } I get this stacktrace in LogCat: 02-18 16:26:06.446: E/AndroidRuntime(1381): FATAL EXCEPTION: AsyncTask #1 02-18 16:26:06.446: E/AndroidRuntime(1381): java.lang.RuntimeException: An error occured while executing doInBackground() 02-18 16:26:06.446: E/AndroidRuntime(1381): at android.os.AsyncTask$3.done(AsyncTask.java:278) 02-18 16:26:06.446: E/AndroidRuntime(1381): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 02-18 16:26:06.446: E/AndroidRuntime(1381): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 02-18 16:26:06.446: E/AndroidRuntime(1381): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 02-18 16:2

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