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restspring-mvcannotations

Attribute value must be constant: @RequestMapping, java spring endpoint

Currently I am trying to reduce the boilerplate in my java spring controllers by creating an interface CRUDRestController, which creates a common set of default endpoints:

interface CRUDRestController<T, Key extends Serializable> {

     //...

     String getEndpoint();

     @RequestMapping(value = getEndpoint() + "/{key}", method = RequestMethod.GET)
     default T get(@PathVariable("key") String key) {
          return getRepository().findOne(stringToKey(key));
     }

     //...
}

The problem is that the above code does not compile since value = getEndpoint() + "/{key}" is supposedly not a compile time constant. In reality every controller's implementation of getEndpoint() is something like this:

@Override
public String getEndpoint() {
    return "/clients";
}

This is clearly known at compile time, however I have no way of telling this to spring. Any ideas?

Solution

  • Maybe that will help you:

    interface CRUDRestController<T, Key extends Serializable> {

     @RequestMapping(value = "/{key}", method = RequestMethod.GET)
     default T get(@PathVariable("key") String key) {
          return getRepository().findOne(stringToKey(key));
     }
}

    and the implementation:

    @RequestMapping("/clients")
public class ClientController implements CRUDRestController<Client, ClientKey> {

//...

}