In this video, we dive deep into Spring Boot’s ApplicationRunner — the often-overlooked brother of CommandLineRunner. You’ll learn how it works, how to implement it, real-world use cases, best practices, and when not to use it.

We’ll cover everything from parsing structured command-line arguments to dependency injection, ordered execution, and how to avoid common pitfalls.

Perfect for Java developers, Spring Boot engineers, and software architects who want to understand application startup hooks at an advanced level.

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📝 Topics Discussed

• What is ApplicationRunner?
• How ApplicationRunner works internally
• Basic implementation with code examples
• Handling command-line arguments
• Dependency injection in ApplicationRunner
• Using ApplicationRunner as a @Bean
• When to use vs. when not to use ApplicationRunner
• Real-world use case: service registration at startup
• Best practices and common pitfalls
• Comparison with CommandLineRunner