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I am building an application using JPA, JSF, EJB, Derby. At this point the application is still small. I have a form in the application to add new products. When adding data to the db it goes smoothly until I restart the application or the server. When I restart either the server or app I get java.lang.StackOverflowError , I still can query the db for the data represented by the product db, but creation product is not possible. I have only 5 entries in the db, as of now, but I am concerned about this happening so early. This is the Ejb (Getter, setter and constructors removed for simplicity): @Stateless public class ProductEJB{ @PersistenceContext(unitName = "luavipuPU") private EntityManager em; public List<Product> findAllProducts() { TypedQuery<Product> query = em.createNamedQuery("findAllProducts", Product.class); return query.getResultList(); } public Product findProductById(int productId) { return em.find(Product.class, productId); } public Product createProduct(Product product) { product.setDateAdded(productCreationDate()); em.persist(product); return product; } public void updateProduct(Product product) { em.merge(product); } public void deleteProduct(Product product) { product = em.find(Product.class, product.getProduct_id()); em.remove(em.merge(product)); } this is the ProductController (Getter, setter and constructors removed for simplicity): @Named @RequestScoped public class ProductController { @EJB private ProductEJB productEjb; @EJB private CategoryEJB categoryEjb; private Product product = new Product(); private List<Product> productList = new ArrayList<Product>(); private Category category; private List<Category> categoryList = new ArrayList<Category&g

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