How to Dynamically Build Variable Values in application.yaml for Spring Boot

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Introduction

Let’s explore this question by examining a typical use case and a straightforward solution.

The Problem Statement

[[See Video to Reveal this Text or Code Snippet]]

Why It Doesn’t Work

The attempt to use key3: key1 + _ + key2 is a misunderstanding of how YAML works—YAML is simply a data serialization format. It doesn’t include functionality for dynamically evaluating expressions or combining values directly.

Solution: Using Property Placeholders

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Solution

Benefits of This Approach

Flexibility: You can easily change the values of key1 and key2, and key3 will automatically reflect these changes.

Readability: The use of placeholders keeps your configuration clean and easy to understand.

Maintainability: Changes to the source values are straightforward to implement and don't require code changes.

Conclusion