Mastering Microservices with Java - Third Edition

The @PathVariable annotation

@PathVariable helps you to create the dynamic URIs. The @PathVariable annotation allows you to map Java parameters to a path parameter. It works with @RequestMapping, where the placeholder is created in a URI, and then the same placeholder name is used either as a PathVariable or a method parameter, as you can see in the CalculationController class method sqrt(). Here, the value placeholder is created inside the @RequestMapping annotation and the same value is assigned to the value of the @PathVariable.

The sqrt() method takes the parameter in the URI in place of the request parameter, for example, http://localhost:8080/calculation/sqrt/144. Here, the 144 value is passed as the path parameter and this URL should ...