> Nondeterministically? Or maybe it was deterministic that "test" won over "main" because it was lexicographically larger?)
Java uses classpath ordering for resolution, so a duplicated fully-qualified class name will take the first on the path. This was useful when patching or pre-dependency management, when some library authors would bundle into a fat jar with incompatible versions. It became disallowed by Java 9's modules without command-line flags. It was always considered a bad practices and a natural fallout of the dynamic nature of the JVM. In your case test classes were resolved before main sources and libraries.
Unfortunately there is a broad view that Java == Spring. In over 15 years of full time Java development, I only used Spring Framework 1.x and 2.0 (migrating from pre-DI). Since then my employers and network all used Guice, though I never selected a role where I realized that choice upfront. That framework is far less magical and explicit, making it very easy to debug. I suppose tool popularity is regional, it's just that this type of Spring magic is abnormal and disliked throughout my work experience.
Java uses classpath ordering for resolution, so a duplicated fully-qualified class name will take the first on the path. This was useful when patching or pre-dependency management, when some library authors would bundle into a fat jar with incompatible versions. It became disallowed by Java 9's modules without command-line flags. It was always considered a bad practices and a natural fallout of the dynamic nature of the JVM. In your case test classes were resolved before main sources and libraries.
Unfortunately there is a broad view that Java == Spring. In over 15 years of full time Java development, I only used Spring Framework 1.x and 2.0 (migrating from pre-DI). Since then my employers and network all used Guice, though I never selected a role where I realized that choice upfront. That framework is far less magical and explicit, making it very easy to debug. I suppose tool popularity is regional, it's just that this type of Spring magic is abnormal and disliked throughout my work experience.