An open-source protocol and framework for REST data services

<dependency>
    <groupId>io.agrest</groupId>
    <artifactId>agrest</artifactId>
    <version>3.3</version>
</dependency>

@ApplicationPath("/")
public class JaxRsApplication extends ResourceConfig {
    public JaxRsApplication() {
        ServerRuntime cayenneRuntime = ..
        AgRuntime agRuntime = AgBuilder.build(cayenneRuntime);
        register(agRuntime);
    }
}

@Path("myentity")
@Produces(MediaType.APPLICATION_JSON)
public class MyEntityResource {

    @Context
    private Configuration config;

    @GET
    public DataResponse<MyEntity> getAll(@Context UriInfo uriInfo) {
        return Ag.select(MyEntity.class, config).uri(uriInfo).get();
    }
}

curl -i -X GET \
'http://127.0.0.1:8080/myapp/my-entity'