JPA test

package pe.edu.cibertec.proyemp.jpa.test;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.TypedQuery;

import pe.edu.cibertec.proyemp.jpa.domain.Department;
import pe.edu.cibertec.proyemp.jpa.domain.Employee;

public class JpaTest
{
    private EntityManager entityManager;

    public JpaTest(EntityManager entityManager)
    {
        this.entityManager = entityManager;
    }

    public static void main(String[] args)
    {
        JpaTest test = createJPAtestFor("persistenceUnit");
        test.execute();
        test.printResults();
    }

    private static JpaTest createJPAtestFor(String persistenceUnit)
    {
        EntityManagerFactory factory = Persistence
                .createEntityManagerFactory(persistenceUnit);
        EntityManager entityManager = factory.createEntityManager();
        return new JpaTest(entityManager);
    }

    private void execute()
    {
        EntityTransaction transaction = entityManager.getTransaction();
        transaction.begin();
        executeTransaction();
        transaction.commit();
    }

    private void executeTransaction()
    {
        try {
            createEmployeesIfNoEmployeesExist();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void createEmployeesIfNoEmployeesExist()
    {
        int employeeCount = getEmployeeList().size();
        if (employeeCount == 0) {
            createEmployees();
        }
    }

    private void createEmployees()
    {
        Department java = new Department("Java");
        entityManager.persist(java);
        entityManager.persist(new Employee("Bob", java));
        entityManager.persist(new Employee("Mike", java));
    }

    private List<Employee> getEmployeeList()
    {
        TypedQuery<Employee> query = entityManager.createQuery(
                "SELECT e FROM Employee e", Employee.class);
        return query.getResultList();
    }

    private void printResults()
    {
        printEmployeeCount();
        listEmployees();
        printProgramTermination();
    }

    private void printEmployeeCount()
    {
        System.out.println("Employee count: " + getEmployeeList().size());
    }

    private void listEmployees()
    {
        List<Employee> employees = getEmployeeList();
        for (Employee e : employees) {
            printEmployee(e);
        }
    }

    private void printEmployee(Employee employee)
    {
        System.out.println("Employee: " + employee);
    }

    private void printProgramTermination()
    {
        System.out.println("... done");
    }
}