@XmlRootElement(name = "user")
public class User {

    private Set<Role> roleSet;

    // other fields omitted

    @XmlElementWrapper(name = "roles")
    @XmlElement(name = "role")
    public Set<Role> getRoleSet() { /* compiled code */ }

    // all other getters with simple JAXB annotations @XmlElement omitted
}

@XmlRootElement(name = "role")
public class ClientRole {
    private String name;
    private boolean active;
    private String id;

    @XmlElement(name = "name")
    public String getName() { /* compiled code */ }

    // all getters with JAXB annotations

}

HttpAuthenticationFeature authenticationFeature = HttpAuthenticationFeature.basic("freddy", "qwerty");
        Client client = ClientBuilder
                .newClient()
                .register(authenticationFeature)
                .register(JacksonFeature.class);
        WebTarget target = client.target("http://localhost:4444/server/");
        Response resp = target
                .path("/api/users/freddy")
                .request()
                .accept(MediaType.APPLICATION_JSON)
                .get();
        User entity = resp.readEntity(User.class);
        System.out.println(entity);

Exception in thread "main" javax.ws.rs.ProcessingException: Error reading entity from input stream.
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:866)
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:783)
    at org.glassfish.jersey.client.ClientResponse.readEntity(ClientResponse.java:326)
    at org.glassfish.jersey.client.InboundJaxrsResponse$1.call(InboundJaxrsResponse.java:111)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:399)
    at org.glassfish.jersey.client.InboundJaxrsResponse.readEntity(InboundJaxrsResponse.java:108)
    at com.test.CreateUserExample.main(CreateUserExample.java:36)
Caused by: com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "roles" (class com.server.dto.auth.User), not marked as ignorable (6 known properties: "enabled", "statusId", "role", "username", "emailAddress", "password"])
 at [Source: org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$UnCloseableInputStream@34cdeda2; line: 1, column: 141] (through reference chain: com.server.dto.auth.User["roles"])
    at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:51)
    at com.fasterxml.jackson.databind.DeserializationContext.reportUnknownProperty(DeserializationContext.java:671)
    at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:771)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1297)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1275)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:247)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:118)
    at com.fasterxml.jackson.databind.ObjectReader._bind(ObjectReader.java:1233)
    at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:677)
    at com.fasterxml.jackson.jaxrs.base.ProviderBase.readFrom(ProviderBase.java:777)
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.invokeReadFrom(ReaderInterceptorExecutor.java:264)
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:234)
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:154)
    at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1124)
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:851)