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kotlinlang

I have  an annotation that I use for a custom moshi Json Adapter
```annotation class MyAnnotation(val value: String)```
When I try to create the adapter like this
```moshi.adapter&lt;MyAnnotation&gt;(Int::class.java, MyAnnotation::class.java)```
It throws
```java.lang.IllegalArgumentException: interface com.melegy.moshi.adapters.myannotaion.MyAnnotation must not declare methods.```
The exception is thrown from here
<https://github.com/square/moshi/blob/master/moshi/src/main/java/com/squareup/moshi/Types.java#L306>
When I debug to see what methods does this mean I found that the method is the parameter in the annotation
```public abstract java.lang.String com.melegy.moshi.adapters.myannotaion.MyAnnotation.value()```
I can create the adapter like this
```val adapter = moshi.adapter(MyDataClass::class.java)```
But I am asking why the first one can’t work.