Web Reference: Feb 2, 2016 · Spring can't distinguish if the request GET http://localhost:8080/api/brand/1 will be handled by getBrand(Integer) or by getBrand(String) because your mapping is ambiguous. Nov 19, 2025 · This ambiguity arises when multiple handler methods share overlapping or identical request mappings. In this blog, we’ll demystify this error, explore its root causes with practical examples, and provide step-by-step solutions to resolve and prevent it. Jul 23, 2025 · In the below code, we have overcome the ambiguous mapping problem just by providing another RequestMapping on top of our controller class which would help spring differentiate between the 2 controllers and map the request to the appropriate REST Controller.
YouTube Excerpt: java.lang.IllegalStateException: Ambiguous handler methods mapped | 500 Internal Server Error
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