JAX-RS 2.0 change default implementation

jax-rs, jersey, rest, resteasy

Solution

Well, JAX-RS relies on the Service Provider convention. On the first lines of the `newBuilder` method you can read:

 Object delegate = FactoryFinder.find(JAXRS_DEFAULT_CLIENT_BUILDER_PROPERTY,
   JAXRS_DEFAULT_CLIENT_BUILDER);

Where `JAXRS_DEFAULT_CLIENT_BUILDER_PROPERTY` is `"javax.ws.rs.client.ClientBuilder"`

In turn, `FactoryFinder` looks

- first for the class name into `META-INF/services/javax.ws.rs.client.ClientBuilder`

- then in the property `javax.ws.rs.client.ClientBuilder` into `${java.home}/lib/jaxrs.properties`

- finally into the System property `javax.ws.rs.client.ClientBuilder`.

So, to use RESTEasy, you should create a file

META-INF/services/javax.ws.rs.client.ClientBuilder

with the text:

org.jboss.resteasy.client.jaxrs.ResteasyClientBuilder

which is the class name of the RESTEasy `ClientBuilder`

Problem

I'm trying to use RESTEasy as JAX-RS 2.0 client implementation. The problem is that I got runtime exception: ``` 06-28 13:29:06.410: E/AndroidRuntime(5745): Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: org.glassfish.jersey.client.JerseyClientBuilder 06-28 13:29:06.410: E/AndroidRuntime(5745): at javax.ws.rs.client.ClientBuilder.newBuilder(ClientBuilder.java:103) ``` So the `newBuilder()` method is searching for `JerseyClientBuilder` if I understand it correct. How can I tell the system to use RESTEasy instead?

Original source