Question

I have the following code:

package testingjpa;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;

public class Main
{

    public static void main(String[] args)
    {
        EntityManagerFactory emFactory = Persistence.createEntityManagerFactory("TestingJPAPU");

        EntityManager em = emFactory.createEntityManager();

        Query query = em.createQuery("UPDATE Passengers p SET p.name = 'Robert' WHERE p.id = 2");

        query.executeUpdate();
        em.close();
    }
}

The problem with this code is that it is throwing a TransactionRequiredException. The entity class works fine since I have tried using other code and it worked perfectly. How can I solve this problem please?

Answer 1

@Resource private UserTransaction mytx;
public static void main(String[] args)
    {
        EntityManagerFactory emFactory = Persistence.createEntityManagerFactory("TestingJPAPU");

        EntityManager em = emFactory.createEntityManager();

        mytx.begin();
        Query query = em.createQuery("UPDATE Passengers p SET p.name = 'Robert' WHERE p.id = 2");

        query.executeUpdate();
        mytx.commit()
        em.close();
    }