Glassfish example source code file (JpaTest.java)

This example Glassfish source code file (JpaTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

calrson, department, department, employee, employee, entitymanager, frechette, io, jpatest, jpatest, printwriter, string, string, transaction, usertransaction, where

The Glassfish JpaTest.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package myapp;

import javax.persistence.*;
import javax.transaction.*;
import java.io.*;

public class JpaTest {

    private EntityManagerFactory emf;
    private EntityManager em;
    private UserTransaction utx;
    PrintWriter out;
    private static Department deptRef[] = new Department[2];
    private static Employee empRef[] = new Employee[5];

    public JpaTest(){}    

    public JpaTest(EntityManagerFactory emf, EntityManager em, 
	    UserTransaction utx, PrintWriter out){
       this.emf = emf;
       this.em = em;
       this.utx = utx;
       this.out = out;
    }    

    protected boolean lazyLoadingInit(){
       boolean status = false;
       out.println("-----lazeLoadingInit()---------");
       try {        
	 deptRef[0] = new Department(1, "Engineering");
	 deptRef[1] = new Department(2, "Marketing");
	 utx.begin();
	 em.joinTransaction(); 
	 for (int i=0; i < 2; i++ ) {
	   em.persist(deptRef[i]);
	 }
	 utx.commit();

	 empRef[0] = new Employee(1, "Alan", "Frechette", deptRef[0]);
	 empRef[1] = new Employee(2, "Arthur", "Wesley", deptRef[0]);
	 empRef[2] = new Employee(3, "Abe", "White", deptRef[0]);
	 empRef[3] = new Employee(4, "Paul", "Hinz", deptRef[1]);
	 empRef[4] = new Employee(5, "Carla", "Calrson", deptRef[1]);
	 utx.begin();
	 em.joinTransaction(); 
	 for (int i=0; i<5; i++ ) {
	   em.persist(empRef[i]);
	 }
	 utx.commit();
	 status = true;
       } catch(Exception ex){
	 ex.printStackTrace();
       }
       out.println("-----status = " + status + "---------");
       return status;
    }

    public boolean lazyLoadingByFind(int employeeID) {
        
      boolean status=true;
      out.println("------------lazyLoadingAfterFind -----------");
      out.println("employeeID = "+ employeeID);
      Employee emp = em.find(Employee.class, employeeID);

      out.println("found: emp.id=" + emp.getId());        

      try {
	// 1. get Department before loading
	Department deptBL = emp.getDepartmentNoWeaving();
	out.println("1. before loading: deptBL="+deptBL);
	String deptNameBL = null;
	if (deptBL != null) {
	  deptNameBL = deptBL.getName();
	  out.println("deptNameBL="+deptNameBL);
	}
	// assert deptBL == null;
        if (deptBL != null) {
            status = false;
	}

	// 2. loading
	String deptName = emp.getDepartment().getName(); 
	out.println("2. loading, deptName = " + deptName);

	// 3. get Department after loading
	Department deptAL = emp.getDepartmentNoWeaving();
	out.println("3. after loading: deptAL="+deptAL);
	String deptNameAL = deptAL.getName();
	System.out.println("deptNameAL="+deptNameAL);
	//   assert deptAL != null
	//   assert deptAL.getName == deptName; 
        if (deptAL == null ||  deptNameAL != deptName) {
	    status = false;
	}
      } catch(Exception ex){
	status = false;
	ex.printStackTrace();
      }

      out.println("-----status = " + status + "---------");
      return status;
    }

    public boolean lazyLoadingByQuery(String fName) {
        
      boolean status=true;
      out.println("------------lazyLoadingByQuery -----------");
      out.println("fName = "+ fName);
      Query query = em.createQuery(
	"SELECT e FROM Employee e WHERE e.firstName like :firstName")
	.setParameter("firstName", fName);;
      Employee emp = (Employee) query.getSingleResult();
    
      out.println("queried: emp.firstName=" + emp.getFirstName());

      try {
	// 1. get Department before loading
	Department deptBL = emp.getDepartmentNoWeaving();
	out.println("1. before loading: deptBL="+deptBL);
	String deptNameBL = null;
	if (deptBL != null) {
	  deptNameBL = deptBL.getName();
	  out.println("deptNameBL="+deptNameBL);
	}
	// assert deptBL == null;
        if (deptBL != null) {
            status = false;
	}

	// 2. loading
	String deptName = emp.getDepartment().getName(); 
	System.out.println("2. loading, deptName = " + deptName);

	// 3. get Department after loading
	Department deptAL = emp.getDepartmentNoWeaving();
	out.println("3. after loading: deptAL="+deptAL);
	String deptNameAL = deptAL.getName();
	out.println("deptNameAL="+deptNameAL);
	//   assert deptAL != null
	//   assert deptAL.getName == deptName; 
        if (deptAL == null ||  deptNameAL != deptName) {
	    status = false;
	}
      } catch(Exception ex){
	status = false;
	ex.printStackTrace();
      }
      out.println("-----status = " + status + "---------");
      return status;
    }

}