micronaut and using the @client to make external calls

Question

So im trying to use the @client annotation when making external calls..

    @Client("/api/external/call")
    @Header(name = ACCEPT, value = "application/json")
    public interface ExternalCall{
    
        @Get
        MyResponse Call();
    }

now im not sure should the @Client be like @Client("http://host") and have the @Get("/api/external/call")

I both but whenever i try to run the app i get the following error

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()

Not sure why this is...

I haven't seen that error before. There is a [Micronaut HTTP Client guide](https://guides.micronaut.io/latest/micronaut-http-client.html) and [user documentation](https://docs.micronaut.io/latest/guide/#clientAnnotation) that should be helpful. Short answer is that the combination of `@Client` and `@Get` should be reachable. — ShingJo, Jul 13 '22 at 18:48
it works if i use a class and a http client... but i wanted to use the @Get — user1555190, Jul 13 '22 at 20:50

score 0 · Answer 1 · answered Jul 13 '22 at 19:01

0

now im not sure should the @Client be like @Client("http://host") and have the @Get("/api/external/call")

If you had this:

 @Client("http://host")
 public interface ExternalCall{
    
        @Get("/api/external/call")
        MyResponse Call();
 }

When you invoke that Call() method, that should generate a GET request to http://host/api/external/call.

Your question mentions Greeting serviceAGreeting() and MyResponse Call(). It isn't clear how those relate to the code you show.

answered Jul 13 '22 at 19:01

Jeff Scott Brown

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That was a incorrect copy and paste.... I tried the above but it gives the same message... its as though the implementation has not been generated by micronaut – user1555190 Jul 13 '22 at 20:51
btw if i use a httpClient client = new HttpClient()...... i can get it to work... but i wanted to use this interface annotated methof. – user1555190 Jul 13 '22 at 20:52
"I tried the above but it gives the same message." - That code is valid and does work. I expect you have soemthing wrong in your build and/or run configuration. If you can share a simple sample project which demonstrates the problem I would be happy to send you a PR. – Jeff Scott Brown Aug 08 '22 at 18:27

Roar S. · Answer 2 · 2023-01-18T14:03:32.877

0

I believe that you're missing the following dependency:

<dependency>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-http-client</artifactId>
</dependency>

edited Jan 18 '23 at 14:03

answered Jul 14 '22 at 07:11

Roar S.

8,103
1
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micronaut and using the @client to make external calls

2 Answers2