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Debugging Spring Dependency Injection Issues — Very Important
🔒 This is a Medium member-only article. If you’re not a Medium member, you can read the full article for free on my blog: Debugging Spring Dependency Injection Issues.
Spring’s dependency injection is powerful — but when something goes wrong, it can be confusing and frustrating. Whether it’s a missing bean, circular dependency, or autowiring failure, figuring out the root cause isn’t always obvious.
In this guide, we’ll walk you through how to debug Spring DI issues step by step — with real-world examples, error explanations, and practical tips that work in both standard Spring and Spring Boot applications.
🔍 What Are Dependency Injection (DI) Issues?
Dependency injection issues usually happen when:
- Spring can’t find a bean
- It finds multiple beans and doesn’t know which one to inject
- There’s a circular dependency
- You’ve used the wrong scope or annotation
- You forgot to annotate something properly
Let’s go through the most common problems and how to fix them.
⚠️ 1. NoSuchBeanDefinitionException
❓ What it means:
Spring couldn’t find a bean for the type you’re trying to inject.
