Chris questions

Chris answers

• java.lang.NullPointerException: Cannot invoke "com.proj.my.repository.OrderRepository.save(Object)" because "this.orderRepository" is null
• JPA EntityExistsException
• How to find all managed attached objects in EntityManager (JPA)
• Set Isolation level in eclipselink
• Hibernate exception: Duplicate entry for key 'PRIMARY'
• JPA ConstraintViolation vs Rollback
• Is it possible to have discriminator column on secondary table in jpa
• In a JPA entity hierarchy using InheritanceType.JOINED, all relationships with subclasses results in foreign key constraints on the superclass table
• JPA call method on lazy (not loaded) collection when detached not working as expected in Eclipselink
• Merging a managed entity on the @ManyToOne side