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Editorial Team
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Asked: 2026-05-27T20:23:00+00:00

My code is: Client client = Client.create(); WebResource web_resource = client.resource(http://www.myhostname.com/); // String string

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My code is:

    Client client = Client.create();
    WebResource web_resource = client.resource("http://www.myhostname.com/");
    // String string = web_resource.path("foo").accept("text/xml").get(String.class);
    // Log.d(getClass().getCanonicalName(), "jax-rs client string = " + string);
    Num num = web_resource.path("foo").accept(MediaType.TEXT_XML_TYPE).get(Num.class);

The last line causes the problem, and I get a similar problem if I replace it with the 2 commented lines with the difference that I get the exception on a different line of MediaType.java.

E/AndroidRuntime(  840): Caused by: java.lang.NullPointerException
E/AndroidRuntime(  840):    at javax.ws.rs.core.MediaType.toString(MediaType.java:265)
E/AndroidRuntime(  840):    at com.sun.jersey.api.client.ClientRequest.getHeaderValue(ClientRequest.java:232)
E/AndroidRuntime(  840):    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.writeOutBoundHeaders(URLConnectionClientHandler.java:276)
E/AndroidRuntime(  840):    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:197)
E/AndroidRuntime(  840):    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:147)
E/AndroidRuntime(  840):    ... 17 more

jersey-client.jar and jersey-core.jar have been added to the package at the top level and have been added to libraries in build path.

AndroidManifest.xml contains:

    <uses-permission android:name="android.permission.INTERNET" />
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1 Answer

  1. Editorial Team

    This was a huge exercise. I believe I might be the only person yet who has gotten Jersey+JAXB working on Android. A specific answer won’t help because after I got around this NullPointerException I got another exception, and then another.

    I had to change source code for Jersey and JAXB in order to make this happen. And I also had to repackage the jars.

    Sorry I know this is a bad quality answer but please comment me if somebody really wants to go down this difficult path in which case I can retrace my steps and help out.

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