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What is lazy loading and eager loading in Java?

Author

William Jenkins

Published Mar 05, 2026

What is lazy loading and eager loading in Java?

Eager Loading is a design pattern in which data initialization occurs on the spot. Lazy Loading is a design pattern which is used to defer initialization of an object as long as it's possible.

Beside this, what is difference between lazy loading and eager loading?

With Eager Loading, all the data is retrieved in a single query, which can then be cached to improve the Application performance. With Eager Loading, we are trading memory consumption for the database round trips. With Lazy Loading, we only retrieve just the amount of data, which we need in a single query.

Furthermore, what is lazy loading in Java? Lazy loading is a concept where we delay the loading of object until the point where we need it. In simple words, Lazy loading is a software design pattern where the initialization of an object occurs only when it is actually needed and not before to preserve simplicity of usage and improve performance.

In respect to this, what is lazy loading and eager loading in spring?

It is called as eager or aggressive loading because of loading all the bean , instance instantiated and initializing at the container start-up only. In the case of lazy loading all the beans will be loaded, instantiated and initialized when the container try to use them by calling getBeans() method.

Should I use lazy loading?

When you SHOULD use lazy load:Most of your images are below the fold, at least a few scroll-clicks from the top of the site. (makes sense not to load images/items that users might not even scroll to) You've got huge images, and no CDN. (saves server resources/bandwidth)

Why is lazy loading bad?

Lazy loading avoids unnecessary resource downloads or code execution. However it can't help when the user actually requests large or numerous resources. A CDN caches resources and can serve them to users much faster – but it may transmit unnecessary resources which users don't actually need.

Is lazy loading enabled by default?

Yes, lazy loading is enabled in the Entity Framework ORM too, it is on by default in Entity Framework, so if you want to enable lazy loading in Entity Framework, you don't need to do anything. And the opposite of lazy loading is eager loading that we will see in this example.

What is meant by lazy loading?

Lazy loading is a design pattern commonly used in computer programming to defer initialization of an object until the point at which it is needed. It can contribute to efficiency in the program's operation if properly and appropriately used. The opposite of lazy loading is eager loading.

What is eager load?

Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading is achieved by use of the Include method. For example, the queries below will load blogs and all the posts related to each blog.

What is eager loading in C#?

Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading is achieved by use of the Include method. For example, the queries below will load blogs and all the posts related to each blog. C# Copy.

What is lazy loading in hibernate Javatpoint?

Lazy loading in hibernate improves the performance. It loads the child objects on demand. Since Hibernate 3, lazy loading is enabled by default, and you don't need to do lazy="true". It means not to load the child objects when the parent is loaded.

When Bean is created in spring?

In Spring, the objects that form the backbone of your application and that are managed by the Spring IoC container are called beans. A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. Otherwise, a bean is simply one of many objects in your application.

What is the default nature of the beans defined in Spring framework?

This means that if you define one bean for a particular class in a single Spring container, then the Spring container will create one and only one instance of the class defined by that bean definition. The singleton scope is the default scope in Spring.

For which of the following criteria can spring boot auto configuration be done?

Spring Boot auto-configuration attempts to automatically configure your Spring application based on the jar dependencies that you have added. For example, If HSQLDB is on your classpath, and you have not manually configured any database connection beans, then we will auto-configure an in-memory database.

How do you use lazy loading?

Lazy loading images means loading images on websites asynchronously — that is, after the above-the-fold content is fully loaded, or even conditionally, only when they appear in the browser's viewport. This means that if users don't scroll all the way down, images placed at the bottom of the page won't even be loaded.

How do you implement lazy loading?

Lazy loading images can be broken down into two steps: Step one is to prevent the image load up front. For images loaded using the <img> tag, the browser uses the src attribute of the tag to trigger the image load.

Which design pattern can be used to implement lazy loading?

Implementations. There are four common ways of implementing the lazy load design pattern: lazy initialization; a virtual proxy; a ghost, and a value holder. Each has its own advantages and disadvantages.

What are some advantages of lazy loading?

The benefits of lazy loading include:
  • Reduces initial load time – Lazy loading a webpage reduces page weight, allowing for a quicker page load time.
  • Bandwidth conservation – Lazy loading conserves bandwidth by delivering content to users only if it's requested.

Can I use native lazy loading?

Support for natively lazy-loading images and iframes is coming to the web! This video shows a demo of the feature: Starting with Chrome 76, you'll be able to use the new loading attribute to lazy-load resources without the need to write custom lazy-loading code or use a separate JavaScript library.

How can I get images to load faster on my website?

Here are ten ways to keep your website speed up to standard:
  1. Implement your own content delivery network (CDN).
  2. Use adaptive images.
  3. Cache, cache, cache.
  4. Evaluate your plugins.
  5. Combine images into CSS sprites.
  6. Enable HTTP keep-alive response headers.
  7. Compress your content.
  8. Configure expires headers.

How do you Lazyload a photo?

Inline images. The most common lazy loading candidates are images as used in <img> elements. When we lazy load <img> elements, we use JavaScript to check if they're in the viewport. If they are, their src (and sometimes srcset ) attributes are populated with URLs to the desired image content.

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