code: public RoleDefinitionInner get(String scope, String roleDefinitionId) {
          return getWithServiceResponseAsync(scope, roleDefinitionId).toBlocking().single().body();
      }
docs: Get role definition by name (GUID).
  
  @param scope The scope of the role definition.
  @param roleDefinitionId The ID of the role definition.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the RoleDefinitionInner object if successful.