FAQ Database Discussion Community


Static string variable with complex initialization in C#

c#,static-variables,lazy-initialization
I have a class with a static string variable that has a somewhat complex initialization (I can't just set it equal to a quoted string like "whatever"). I need to run a few lines of code to actually create the value. Once it gets set, its value won't change. It's...

LazyInitializationException in selectManyCheckbox on @ManyToMany(fetch=LAZY)

jsf,jpa,primefaces,lazy-initialization,selectmanycheckbox
What is the best way to handle multiple chackboxes when you nead to fill a JPA M:N relation ... for example I have an JPA entity Hardware and the entity Connectivity. Hardware has a set for connectivity : private Set<Connectivity> connectivities = new HashSet<Connectivity>(0); and has a setter and getter...

Spring + Hibernate : LazyInitializationException

spring,hibernate,session,lazy-initialization
I am getting the LazyInitializationException when i try to retrieve information inside a POJO. User.java public class User implements java.io.Serializable { private Set groups = new HashSet(0); public Set getGroups() { return this.groups; } } UserController.java @RequestMapping(value = "/home", method = RequestMethod.GET) public ModelAndView getHome(HttpServletRequest request) throws Exception { ModelAndView...

Swift 2.0 : infer closure type error

swift,types,init,lazy-initialization
I get error Unable to infer closure type in the current context In code which was working in Swift 1.2 private lazy var _messagesVC = { return MessagesViewController(nibName:"MessagesViewController",bundle:nil)}() Whole View Controller where I get this error import UIKit class FriendsViewController: UIViewController { @IBOutlet weak var containerView: UIView! @IBOutlet weak var...

Invoking proxied DAO methods from Spring stand alone client :- could not initialize proxy - no Session

spring,hibernate,lazy-initialization
I have a third party jar in my class path which has some services and DAO's developed on top of Spring 2.0.6 and Hibernate3.2.6. I need to call some of the services and daos. Using ClassPathXmlApplicationContext I'm able to load the application context and able to access the services and...

symfony2 event dispatcher lazy loading listener

php,symfony2,events,dispatcher,lazy-initialization
I'm creating some of my own events using Symfony Event Dispatcher, which works fine. I noticed however, that the listener I configured in symfony is not lazy loaded, it is always initialized. It is rarely used however. The config in my services.yml looks like: my.handler: class: Acme\AcmeBundle\DependencyInjection\MyHandler arguments: - @my.dependency...

Cannot implicitly convert Lazy to Lazy

c#,interface,initialization,lazy-initialization
I am coding a MVC 5 internet application and I have a question in regards to using an interface with Lazy<T> initialization. Here is the class definition in question: public class WebAPITokenService1_0 : IWebApiTokenService Here is my code that works with out using the interface in the declaration: Declaration: Lazy<WebAPITokenService1_0>...

Are Swift constants lazy by default?

swift,lazy-initialization
Something I still not quite understand about Swift ... let's say I want a property that instantiates a class in a base class used for several sub classes, e.g. ... let horse = Horse(); Is horse instantiated right after app/class initialisation or when the property is accessed for the first...

Can Try be lazy or eager in Scala?

scala,lazy-evaluation,lazy-initialization,eager
AFAIK, Iterator.map is lazy while Vector.map is eager, basically because they are different types of monads. I would like to know if there is any chance of having a EagerTry and LazyTry that behave just like the current Try, but with the latter (LazyTry) delaying the execution of the closure...

Lock-free thread-safe lazy initialization

java,multithreading,lazy-initialization,lock-free,wait-free
To perform lock-free and wait-free lazy initialization I do the following: private AtomicReference<Foo> instance = new AtomicReference<>(null); public Foo getInstance() { Foo foo = instance.get(); if (foo == null) { foo = new Foo(); // create and initialize actual instance if (instance.compareAndSet(null, foo)) // CAS succeeded return foo; else //...

Lazy initialization confusion

.net,vb.net,collections,ienumerable,lazy-initialization
Scenario I'm trying to read the resources contained in a .Net managed resource file, a ResX file. I've designed this simple class that will serve me to store/struct a collection of resources: Public Class Resource Public Property Name As String Public Property Data As Object Public ReadOnly Property Type As...

LazyInitializationException when serializing Collection with Jackson

java,hibernate,jackson,resteasy,lazy-initialization
I'm building an application using AngularJs and Rest services (RestEasy) where I need to display a list of products. Once the list is loaded when the user clicks on one of the products, the details and images of this product are loaded. I don't want to load the collections associated...

Should Lazy be preferred to lazy initialization in a getter?

c#,.net,lazy-initialization
From .NET 4 onwards, Lazy<T> can be used to lazily initialize objects. Intuitively, lazy initialization can also be performed in a public property's getter to provide the same functionality to the caller. I wonder if Lazy<T> offers any inherent advantage over the latter and should thus be preferred? Personally, I...