Spring Data JPA findAll throws NullPointerException

Question

I have following autowired repository

@Repository
public interface ProsessiAjossaRepository extends JpaRepository<ProsessiAjossa, Long> {

    ProsessiAjossa findByProsessi(final Prosessi prosessi);
}

automatically generated findById() method works fine, but findAll() throws null pointer exception for some reason. What may be wrong?

Answer 1

The most likely cause of the null pointer exception when using the findAll() method is that there is no data available in the database that matches the criteria specified. To troubleshoot this issue, try adding a few entries into the database and then running the findAll() method again. Additionally, you can also check the database for correct data type and field configurations, as these can lead to unexpected results.