Error generating model classes Caused by IllegalArgumentException: modifiers [protected, abstract] must contain one of [public, private]

[eboudrant]

Build failed with :

e: error: Epoxy Processor Exception: Error generating model classes Caused by IllegalArgumentException: modifiers [protected, abstract] must contain one of [public, private]       Stacktrace:   
  com.airbnb.epoxy.ModelBuilderInterfaceWriter.writeInterface(ModelBuilderInterfaceWriter.kt:57)
  com.airbnb.epoxy.GeneratedModelWriter.generateClassForModel(GeneratedModelWriter.kt:174)
  com.airbnb.epoxy.GeneratedModelWriter.generateClassForModel$default(GeneratedModelWriter.kt:134)
  com.airbnb.epoxy.ModelProcessor.writeModel(ModelProcessor.kt:85)    
  com.airbnb.epoxy.ModelProcessor.processModels(ModelProcessor.kt:69)     
  com.airbnb.epoxy.EpoxyProcessor.processRound(EpoxyProcessor.java:187) 
  com.airbnb.epoxy.EpoxyProcessor.process(EpoxyProcessor.java:165)

> Task :lib:kaptDebugKotlin FAILED

Creating this issue to add more information in the error message.

I am still not sure what is the cause, the change we made was to move some epoxy code from app module to a library module.

epoxyVersion = '3.3.0'
gradle_android_version = '3.2.1'

[elihart]

Thanks for posting - this is an exception thrown from javapoet when building the model interface, i'm taking a look

[elihart]

I have a basic idea of what the issue is, but still need to reproduce it.

Do you have a model that has a protected method on it, which returns the type of the model? If you could give me the code of the model that is causing the issue that would be helpful

[eboudrant]

I will try to find the models, the error was not verbose enough to give the culprit (and we have a lot). It happen with no change except move the models from a app module to a lib module. May be a kapt flag missing in our new lib module...

[eboudrant]

Ok got it, stupid error ;) while moving to libraries I did a brutal replace from import ....R to import ...R2 (butterknife hack) then I got some compilation issue in few files :

import com.airbnb.epoxy.EpoxyModelClass
import com.airbnb.epoxy.EpoxyModelWithHolder
import ...ui.R2
import ...ui.epoxy.KotlinEpoxyHolder

@EpoxyModelClass
abstract class HeaderModel : EpoxyModelWithHolder<HeaderModel.Holder>() {

    override fun getDefaultLayout() = R.layout.my_layout // compilation error as R not imported

    class Holder : KotlinEpoxyHolder()
}

So the problem is the Epoxy annotation processor fail before the file can get compiled thus making the troubleshooting harder.

It could help troubleshooting to have an Epoxy error handing in the annotation processor that would output the model class name being generated.

[elihart]

ah, that'll do it.

yes, I can try to include model information for where the exception happens. thanks for posting the context!

[toshanmugaraj]

ah, that'll do it.

yes, I can try to include model information for where the exception happens. thanks for posting the context!

How to add model information to trace this error, I am now facing same error but no clue of the issue.

[ibrahimFakharany]

ah, that'll do it.

yes, I can try to include model information for where the exception happens. thanks for posting the context!

I am facing this problem and couldn't find the model name that cause this error