lazy-loading

my question is regarding JPA 2.0 with Hibernate, @OneToOne relationships and lazy loading. First my setup: Spring 3.0.5.RELEASE SprnigData JPA 1.0.1.RELEASE Hibernate 3.5.2-Final DBMS: PostgreSQL 9.0 I recently came across the fact, that a @OneToOne relationship can't be fetched the lazy way (FetchType.LAZY), at least not without byte code instrumentation, compile time weaving or the like. Many sites out there say this, for example: http://community.jboss.org/wiki/SomeExplanationsOnLazyLoadingone-to-one http://justonjava.blogspot.com/2010/09/lazy-one-to-one-and-one-to-many.html Making a

Take this class as example: public class Category : PersistentObject<int> { public virtual string Title { get; set; } public virtual string Alias { get; set; } public virtual Category ParentCategory { get; set; } public virtual ISet<Category> ChildCategories { get; set; } public /*virtual*/ void Add(Category child) { if (child != null) { child.ParentCategory = this; ChildCategories.Add(child); } } } When running the application without the virtual keyword of add method, I getting this error: method Add should be 'public/protected virtual' or 'protected internal virtual' I understand why

For performance reason, I use as often as possible the only() keyword when writing up a mongoid query in order to specify the fields I want to load. The usual suspect, is for instance when I want a user's email of all my admins only for display purposes. I would write: User.where(:groups => :admins).only(:email).each do |u| puts u.email end I do this because my user model are quite full of a lot of data that I can gladly ignore when listing a bunch of emails. However, now let imagine, that my users are referenced via a Project model, so that for each project I can do: project.user . Thanks to

I am using spring 4.1.4.RELEASE + hibernate 4.3.6.Final, here is my entity code: public class BaseEntity implements Serializable { } public class MarketInfo extends BaseEntity { @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "id") private int id; @Column(name = "market_id", unique = true, length = 15) private String marketId; @OneToMany(fetch = FetchType.LAZY, mappedBy = "market") private List<MarketChannelGroup> channelGroups; public List<MarketChannelGroup> getChannelGroups() { return channelGroups; } public void setChannelGroups(List<MarketChannelGroup> channelGroups) {

I have successfully implemented like this for lazy loading in custom list and the code I used for this is here: Custom List With Images in Blackberry In the linked question, I position the y coordinate of heart icon and I resolved the problemm of linked Question. if (logoThumbnailImage != null && logoThumbnailImage.length > index && logoThumbnailImage[index] != null) { EncodedImage img = logoThumbnailImage[index]; graphics.drawImage(0, y + 10, Display.getWidth(), Display.getHeight() - 100, img, 0, 0, 0); graphics.drawImage(300, y+400, heart.getWidth(), heart.getHeight(), heart, 0, 0, 0); Now I

I'm working on a Rails 3 app, and I've got a hierarchy of classes in my lib folder, e.g.: lib ├── assets ├── tasks │ └── import.rake └── importer ├── base.rb └── source ├── facebook.rb ├── google.rb └── twitter.rb I've updated config/application.rb to include this line: config.autoload_paths += %W(#{config.root}/lib) Then inside of Importer::Base , I have an instance method that attempts to load all classes in the Provider module, e.g.: Importer::Source.constants.each do |class_name| Importer::Source.const_get(class_name).process end The three classes in lib/importer/base have a class