@Qualifier vs @Primary in Spring Boot | Dependency Injection Simplified

Java Spring Boot Interview Q18 !! In this video, we explore two essential Spring Boot annotations: @Qualifier and @Primary. Understanding these annotations is crucial for mastering dependency injection and resolving bean conflicts in Spring applications. We begin by explaining what the @Qualifier annotation does, why it is used in Spring Boot, and the scenarios where it becomes necessary. You’ll also learn about some of its limitations and why relying solely on @Qualifier may not always be ideal. Next, we cover the @Primary annotation — how it helps define a default bean when multiple candidates are available, and how it works together with @Qualifier to support cleaner, conflict-free dependency injection. This video is especially helpful for those trying to understand the dependency inversion principle, Spring Boot annotations, and the practical differences between @Qualifier and @Primary. Whether you're preparing for interviews or working on real-world Spring Boot projects, this tutorial will give you clarity and confidence in using these annotations. 00:00 : Introduction 00:38 : @Qualifier Hands On : Example 1 06:58 : @Qualifier Hands On : Example 2 11:34 : @Primary Annotation 12:46 : Interview Tip of the Day !! Spring Boot Basics to Know : Spring Boot and Java Setup https://youtu.be/M7XhAj6E7xQ?si=Z_SfJ7OtGPjGkNTR Project Object Model File | Understanding pom.xml https://www.youtube.com/watch?v=2RE-a74EQDk&t=10s How to create an API ? https://www.youtube.com/watch?v=3ruFGipx5JE&t=6s How to Connect Spring Boot to a Database ? https://www.youtube.com/watch?v=1P1MswyGlOU&t=38s Instagram : https://www.instagram.com/the.curious_coder #interview #springboot #java