OSGI, JPA

Trying to use JPA in OSGI always gives me the error “javax.persistence.PersistenceException: No Persistence provider for EntityManager named …”. Reason: Persistence.createEntityManagerFactory() uses the ClassLoader to load resources. It seems to be the ThreadContext ClassLoader. So in OSGI it fails due to the OSGI classloader tricks. Using the tricks given in http://lsd.luminis.nl/jpa-persistence-in-osgi-with-openjpa/ I got this to work. That […]

where does hibernate lose my data?

playing with JPA, I do several transactions. It seems between the transactions, all the data is always lost from the database. Setting hibernate.hbm2ddl.auto to false seems to solve it. Strange but just give me working code plz..

hiiiibernateee

another set of points -ran into trouble trying to get hibernate to check my 2nd entity that is referencing the first one. the mysql create broke on the wrong innodb syntax noted before. and could not just leave the second one in as i wanted to reference the first one. solution. org.hibernate.dialect.MySQL5InnoDBDialect is a correct dialect […]