Question

I have a project using JSF primefaces and EJB managed Beans with hibernate storage.
http://www.primefaces.org/showcase/ui/treeAjax.jsf

Question: I keep on getting a out of memory or stack overflow errors can you see a problem with my recursion?

@ManagedBean(name = "categoryController")
@RequestScoped
public class CategoryController implements Serializable {
    ...

    @EJB
    private CategoryFacade ejbFacade;
    private TreeNode root;

    public TreeNode getRoot() {
        return root;
    }

    @PostConstruct
    public void init() {
        root = new DefaultTreeNode("Root", null);
        System.out.print("Facade value=" + getFacade());
        Category categoryRoot = getFacade().find(new Integer(1));
        getSubcategories(categoryRoot, root);

    }

    private void getSubcategories(Category categoryRoot, TreeNode root) {
        List<Category> list = getFacade().findByNamedQuery("Category.findByPCatid", "pcatid", categoryRoot);
        Iterator<Category> it = list.iterator();
        while (it.hasNext()) {
            Category subcategory = it.next();
            TreeNode nextNode = new DefaultTreeNode(subcategory.getUcatid(), root);
            getSubcategories(subcategory, nextNode);

        }

    }

    ...
}

Answer 1

The problem is that your recursion is in an infinite loop on your root element.
try adding this:

if (!subcategory.getCatid().equals(new Integer(1))) {
     getSubcategories(subcategory, nextNode);
}

You can also look up the Primefaces event listeners to generate the tree on demand.
http://www.primefaces.org/showcase/ui/treeEvents.jsf