CategorySessionBean.java

package com.todo.ejb;

import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import com.todo.entity.Category;

@Stateless
public class CategorySessionBean implements CategorySessionBeanLocal {
	
	@PersistenceContext(unitName = "TodoJPA")
	private EntityManager entityManager;
	
	public Category addCategory(String title){
		
		Category category=new Category();
		category.setTitle(title);
		
		entityManager.joinTransaction();
		entityManager.persist(category);
		
		return category;
		
	}
	
	public List<Category> getCategoryList(){
		 
		List<Category> list=null;
		
		Query query=entityManager.createQuery("select c from Category as c");
		
		list = (List<Category>)query.getResultList();
		
		return list;		
		
	}
}