https://www.wimdeblauwe.com/tags/auto-configuration/ Recent content in Auto-Configuration on Wim Deblauwe Hugo en-us © 2022 Wim Deblauwe Sun, 06 Sep 2026 00:00:00 +0000 https://www.wimdeblauwe.com/blog/2026/09/06/testing-your-auto-configuration-against-a-missing-optional-dependency/ Sun, 06 Sep 2026 00:00:00 +0000 https://www.wimdeblauwe.com/blog/2026/09/06/testing-your-auto-configuration-against-a-missing-optional-dependency/ <div class="paragraph"> <p>If your library or starter has optional dependencies, it is surprisingly easy to write an auto-configuration that blows up at startup for everybody who does <em>not</em> have that optional dependency on the classpath. Even more annoying: <code>FilteredClassLoader</code>, the tool that Spring Boot gives us for this kind of test, cannot reproduce that failure. In this blog post, I will show you why, and give you a small <code>HidingClassLoader</code> that can.</p> </div>