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jpa entity manager factory helper

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May 22nd, 2012
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Java 0.71 KB | None | 0 0
  1. package my.package;
  2.  
  3. import javax.persistence.EntityManagerFactory;
  4. import javax.persistence.Persistence;
  5.  
  6. public class EntityManagerFactoryHelper {
  7.  
  8.     private static EntityManagerFactory instance = null;
  9.  
  10.     public static EntityManagerFactory getInstance() {
  11.         if (instance == null) {
  12.             new EntityManagerFactoryHelper();
  13.         }
  14.         return instance;
  15.     }
  16.  
  17.     private EntityManagerFactoryHelper() {
  18.         try {
  19.             // Setting up persistence unit factory here
  20.             instance = Persistence.createEntityManagerFactory("xxx");
  21.         } catch (ExceptionInInitializerError e) {
  22.             throw e;
  23.         }
  24.     }
  25.  
  26.     @Override
  27.     protected void finalize() throws Throwable {
  28.         super.finalize();
  29.         if (instance != null) {
  30.             instance.close();
  31.         }
  32.     }
  33. }
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