using hibernate with embedded derby

Question

i want to use hibernate with embedded derby in a standalone application, and i have some questions:

1. What jar

Answer 1

I use Apache Derby with Hibernate for testing one of my project's model classes (their equals, hashCode implementations, queries, etc.). MySQL is used as the production database. I choose Derby instead of HSQLDB, because I've experienced some incompatibilities with Hibernate and HSQLDB, meaning, given my entities (their name, schema, keys) and their relation Hibernate couldn't create my database schema in HSQLDB, while it could with Derby. That said, maybe I messed up something; also the incompatibilities could have been resolved.

Anyway, here is what I use in my tests (I've modified my pom.xml so that it would include Derby as a runtime dependency and run a single test, just to make sure it's working).

pom.xml

                                      
  ...                               
                                        
    org.hibernate                
    hibernate-entitymanager
    3.6.8.Final                  
                                       
                                        
    org.apache.derby             
    derby                  
    10.8.2.2                     
    runtime                          
                                       
  
                                        
    org.slf4j                    
    slf4j-simple           
    1.6.4                        
    runtime                          
                                       
  ...                             
                                     

persistence.xml

  
    org.hibernate.ejb.HibernatePersistence
    Test
    
      
      
      
      
      
      
    
  

Test entity

@Entity
@Table(name = "test")
public class Test {

  @Id
  public int id;

  @Basic
  public String data;
}

Test

EntityManagerFactory emf = Persistence.createEntityManagerFactory("test");  
EntityManager em = emf.createEntityManager();                               
EntityTransaction tx = em.getTransaction();                                 

Test test = em.find(Test.class, 1);                                         
if (test == null) {                                                         
  test = new Test();                                                        
  test.id = 1;                                                              
  test.data = "a";                                                          

  tx.begin();                                                               
  em.persist(test);                                                         
  tx.commit();                                                              
}                                                                           

System.out.format("Test{id=%s, data=%s}\n", test.id, test.data);            

em.close();                                                                 
emf.close();