Handling ambiguous handler methods mapped in REST application with Spring

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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.

Try using a query parameter for the getBrand(String) method. It seems more appropriate, since you are performing a query:

@RequestMapping(value = "/{id}", method = RequestMethod.GET)
public Brand getBrand(@PathVariable Integer id) {
    return brandService.getOne(id);
}

@RequestMapping(method = RequestMethod.GET)
public List<Brand> getBrands(@RequestParam(value="name") String name) {
    return brandService.getSome(name);
}

Using the approach described above:

  • Requests like GET http://localhost:8080/api/brand/1 will be handled by getBrand(Integer).
  • Requests like GET http://localhost:8080/api/brand?name=nike will be handled by getBrand(String).

Just a hint: As a common practice, prefer plural nouns for collections of resources. So instead of /brand, use /brands.

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