import com.liferay.portal.kernel.model.User;

import com.liferay.portal.kernel.service.UserLocalService;

import java.util.Collections;

import java.util.Set;

import javax.ws.rs.ApplicationPath;

import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.Produces;

import javax.ws.rs.core.Application;

import org.osgi.service.component.annotations.Component;

import org.osgi.service.component.annotations.Reference;

@ApplicationPath("/allUsers")

@Component(

    immediate = true, property = {"jaxrs.application=true"},

    service = Application.class

)

public class UsersRestService extends Application {

    @Override

    public Set<Object> getSingletons() {

        return Collections.singleton((Object)this);

    }

    @GET

    @Path("/list")

    @Produces("text/plain")

    public String getAllUsers() {

        StringBuilder result = new StringBuilder();

        for (User user : _userLocalService.getUsers(-, -)) {

            result.append(user.getFullName()).append(",\n");

        }

        return result.toString();

    }

    @Reference

    public void setUserLocalService(UserLocalService userLocalService) {

        _userLocalService = userLocalService;

    }

    private UserLocalService _userLocalService;

}