Spring Boot @Lookup Explained in 12 Minutes | Prototype Bean Injection
In this video, we will understand the @Lookup annotation in Spring Boot and why it exists.
When a singleton bean depends on a prototype bean, normal dependency injection does not work correctly because Spring injects the prototype bean only once during application startup.
To solve this problem, Spring provides the @Lookup annotation, which allows Spring to dynamically retrieve a new bean instance from the container every time the method is called.
In this tutorial, we will cover:
• What is Prototype Scope in Spring
• The Singleton–Prototype Injection Problem
• Why normal dependency injection fails
• What is the @Lookup annotation
• How Spring uses CGLIB to override methods
• Practical working example
• When to use @Lookup in real applications
This tutorial is useful for Java developers, Spring Boot developers, and backend engineers who want to understand advanced Spring concepts like method injection and bean scopes.
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