JPASingleton.java

/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package beans.integration.impl;

import javax.ejb.Singleton;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import beans.jpa.Laptop;

@Singleton
public class JPASingleton {
  
  @PersistenceContext(unitName="ejb-test")
  private EntityManager em;
  
  public void editEntity(String serial) {
    Laptop l = em.find(Laptop.class, serial);
    
    l.setHardDiskSize(Integer.MAX_VALUE);
    l.setNumberOfCores(4);
  }

}