WARN SqlExceptionHelper:143 - SQL Error: 0, SQLState: 08S01- SqlExceptionHelper:144 - Communications link failure

Question

I have problem with Hibernate (hibernate-core-4.1.9.Final.jar)

Case 1: Hibernate testing inside for loop. Everything went well.

for(in         


        

Answer 1

I had the same issue just because I forgot to wrap my hibernate code in a transaction. Apparently the connection to DB is not closed until you commit a transaction. Here is a valid example:

Session session = HibernateUtils.getSession();
Transaction tx = session.beginTransaction();
Category cat = null;

try{
    cat = (Category)session.get(Category.class, 1);
    tx.commit();
}catch(Exception ex){
    tx.rollback();
}finally{           
    session.close();
}

return cat;