在Android库项目中使用Dagger2在运行时抛出`NoClassDefFoundError`

Question

I'm using dagger2 in one of my android library. After finish the library project, I use gradle uploadArchive to upload an aar to a maven repo. then use the compile group:artifect:version@aar syntax in an app project to consume the library project. I have no problem building the app, but at runtime, it throws NoClassDefFoundError for the class MyModule_ProvideAppFactory generated my Dagger2. I figure this class is generated for the method @Provides public Application provideApp() . Yet the generated DaggerMyComponent can be found at runtime, since the exception happens inside DaggerMyComponent class. I even included the following dependencies in the app project

compile 'com.google.dagger:dagger:2.0'
compile 'javax.annotation:jsr250-api:1.0'

Yet the problem still existed. I'm pretty sure not because of the 65K method limits problem because we have enabled multidex in the app project. I'm not sure what I've been missing, or can Dagger2 be used this way?

Answer 1

Turned out I was missing another dependency which are required by the classes generated by Dagger2. Add compile 'javax.inject:javax.inject:1'

to the gradle file and it works fine.