/*
 * The MIT License
 *
 * Copyright 2017 oncore.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.oncore.calorders.rest.service.extension;

import com.oncore.calorders.rest.Product;
import com.oncore.calorders.rest.service.ProductFacadeREST;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Stateless;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

/**
 *
 * @author oncore
 */
@Stateless
@Path("com.oncore.calorders.rest.product")
public class ProductFacadeRESTExtension extends ProductFacadeREST {

    @GET
    @Path("findActiveProductsByProductType/{productTypeCode}")
    @Produces(MediaType.APPLICATION_JSON)
    public List<Product> findActiveProductsByProductType(
            @PathParam("productTypeCode") String productTypeCode) {
        System.out.println("Running findActiveProductsByProductType by " + productTypeCode);

        List<Product> results = super.getEntityManager()
                .createQuery("SELECT p FROM Product p "
                        + "        JOIN p.prdCategoryCd c"
                        + "        WHERE c.code = :categoryCode "
                        + "        AND p.prdActiveInd = 1", Product.class)
                .setParameter("categoryCode", productTypeCode)
                .getResultList();

        return results;
    }
}

/*
 * The MIT License
 *
 * Copyright 2017 oncore.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.oncore.calorders.rest.service.extension;

import com.oncore.calorders.rest.Product;
import com.oncore.calorders.rest.service.ProductFacadeREST;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Stateless;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

/**
 *
 * @author oncore
 */
@Stateless
@Path("com.oncore.calorders.rest.product")
public class ProductFacadeRESTExtension extends ProductFacadeREST {

    @GET
    @Path("findActiveProductsByProductType/{productTypeCode}")
    @Produces(MediaType.APPLICATION_JSON)
    public List<Product> findActiveProductsByProductType(
            @PathParam("productTypeCode") String productTypeCode) {
        System.out.println("Running findActiveProductsByProductType by " + productTypeCode);

        List<Product> results = super.getEntityManager()
                .createQuery("SELECT p FROM Product p "
                        + "        JOIN p.prdCategoryCd c"
                        + "        WHERE c.code = :categoryCode "
                        + "        AND p.prdActiveInd = 1", Product.class)
                .setParameter("categoryCode", productTypeCode)
                .getResultList();

        return results;
    }
    
    /**
     * Determines if a user id exists
     *
     * @param userId a valid userid
     * @return an true if the user id is already used.
     */
    @GET
    @Path("doesProductNameExist/{productName}")
    @Produces({MediaType.APPLICATION_JSON})
    public List<Product> doesProductNameExist(@PathParam("productName") String productName) {

        List<Product> products = null;

        try {
            products = getEntityManager().createNamedQuery("Product.findByPrdName",
                    Product.class).setParameter("prdName", productName).getResultList();
        } catch (Exception ex) {
            ex.printStackTrace();
            products = null;
        }

        return products;
    }
}

Add Product page. The page is able to pull back reference data. The contains page level validations.