@BindValueIntoMap fields must have exactly one @MapKey. Found []

[tynn]

This error is triggered by BindValueMetadata:

@BindValueIntoMap fields must have exactly one @mapkey. Found []

So in general this feature might be working with custom keys, but not with with any of the provided @MapKey defining @Target(METHOD) to only allow to annotate methods

• @ClassKey
• @IntKey
• @LongKey
• @StringKey

[Chang-Eric]

Just to make sure I'm understanding, when you get that error you must also get some error from the compiler saying that the @ClassKey or whichever one you are using cannot be applied to a field, right?

I assume this issue is less about the error message and more about a request to add the target to those dagger annotations. Is that correct?

[tynn]

Yes, the error for adding a provided map key to a property is:

This annotation is not applicable to target 'member property with backing field' and use site target '@field'

In my case I was using @StringKey("...").

I raised the issue here as the error itself could not be resolved. Adding the target might be the simples solution, but not the only one. In general I would like to request a working example (for Kotlin) or test case to use @BindValueIntoMap for testing purposes.