I’m encountering an issue while trying to persist entities using Hibernate in my Java application. I have a straightforward setup with entity classes annotated with JPA annotations and a Hibernate session factory configured. However, when I attempt to save an entity using the session’s save() method, I consistently encounter a NullPointerException. Here’s a simplified version of my code

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class Main {
    private static SessionFactory factory;

    public static void main(String[] args) {
        try {
            factory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            System.err.println("Failed to create session factory: " + ex);
            throw new ExceptionInInitializerError(ex);
        }

        Session session = factory.openSession();
        session.beginTransaction();

        // Create and persist a new entity
        MyEntity entity = new MyEntity();
        entity.setName("Test Entity");
        session.save(entity); // NullPointerException occurs here

        session.getTransaction().commit();
        session.close();
    }
}

And here’s the entity class MyEntity

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class MyEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
}

I’ve double-checked my Hibernate configuration and entity mappings, but I can’t seem to figure out why this NullPointerException is happening. Any insights or suggestions would be greatly appreciated.