title: micronaut and using the @client to make external calls
body: <p>So im trying to use the @client annotation when making external calls..</p>
  <pre class="lang-java prettyprint-override"><code>    @Client(&quot;/api/external/call&quot;)
      @Header(name = ACCEPT, value = &quot;application/json&quot;)
      public interface ExternalCall{
      
          @Get
          MyResponse Call();
      }
  </code></pre>
  <p>now im not sure should the @Client be like @Client(&quot;http://host&quot;) and have the @Get(&quot;/api/external/call&quot;)</p>
  <p>I both but whenever i try to run the app i get the following error</p>
  <p>Unexpected error occurred: All possible Introduction advise exhausted and no implementation found for method: MyResponse Call()
  io.micronaut.aop.exceptions.UnimplementedAdviceException: All possible Introduction advise exhausted and no implementation found for method: MyResponse Call()</p>
  <p>Not sure why this is...</p>