Today I got a really weird behavior: some spring context file was loaded into the same context twice. This caused exception, since some beans are expected to be singletons, while I got two instances.
In this post I'm not going to describe what exactly was the problem. But rather how I investigated it.
So in order to see what are the actual files being loaded and what is the source of the definition that caused them to be loaded I put a breakpoint in org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(InputSource, Resource).
That's all. Try it yourself :)
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