HibernateException: Could not obtain transaction-synchronized Session for current thread

Question

I am getting error:

Exception in thread \"main\" org.hibernate.HibernateException: 
Could not obtain transaction-synchronized Session for current thread
         


        

Answer 1

The error org.hibernate.MappingException: Unknown entity: ProductPart indicates there is no entity with name ProductPart. One way to fix this issue is to pass the Class object to createCriteria method as:

createCriteria(ProductPart.class)

From API the difference in using String and Class is as follows:

Session.createCriteria(String)

Create a new Criteria instance, for the given entity name. 

Session.createCriteria(Class)

Create a new Criteria instance, for the given entity class, or a superclass of an entity class, with the given alias.

If you pass a String then hibernate looks for an entity whose name is declared as ProductPart.