I am using Android Studio for my Android projects. I faced an issue when builds crash with strange stacktrace, like this:

Error:Execution failed for task ':app:compileDevDebugJavaWithJavac'. java.lang.RuntimeException: failure, see logs for details. cannot generate view binders java.lang.NullPointerException at android.databinding.tool.reflection.ModelMethod.isBoxingConversion(ModelMethod.java:155) at android.databinding.tool.store.SetterStore.isBetterParameter(SetterStore.java:946) at android.databinding.tool.store.SetterStore.getBestSetter(SetterStore.java:838) 

and it was seemed that the databinding became broken as whole.

I made refactoring before and moved classes between packages.