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public class Category { private Category parentCategory; private Set<Category> childCategories; private String name; public Category() { childCategories = new HashSet<Category>(); } public Category getParentCategory() { return parentCategory; } public void setParentCategory(Category parentCategory) { this.parentCategory = parentCategory; } public Set<Category> getChildCategories() { return childCategories; } public void setChildCategories(Set<Category> childCategories) { this.childCategories = childCategories; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "Category [childCategories=" + childCategories + ", name=" + name + ", parentCategory=" + parentCategory + "]"; } } public static void main(String[] args) { Category books = new Category(); books.setName("Books"); books.setParentCategory(null); Category novels = new Category(); novels.setName("Novels"); novels.setParentCategory(books); books.getChildCategories().add(novels); //novels.setChildCategories(null); System.out.println("Books > " + books); } The System.out.println is generating the StackOverflowError .

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