NoClassDefFoundError when running a search using a Hits view

I’m trying to integrate the code from your Android tutorial into my app. When running helper.search(), the app crashes, failing to find a class def for “com.android.databinding.library.baseAdapters.DataBinderMapperImpl”.

My app uses Kotlin and AndroidX, if it makes any difference.

Do you want to request a feature or report a bug? Bug

Bug: What is the current behavior? Activity crashes with stack trace

java.lang.NoClassDefFoundError: Failed resolution of: Lcom/android/databinding/library/baseAdapters/DataBinderMapperImpl;
        at com.algolia.instantsearch.DataBinderMapperImpl.collectDependencies(DataBinderMapperImpl.java:71)
        at androidx.databinding.MergedDataBinderMapper.addMapper(MergedDataBinderMapper.java:58)
        at androidx.databinding.MergedDataBinderMapper.addMapper(MergedDataBinderMapper.java:60)
        at androidx.databinding.DataBinderMapperImpl.<init>(DataBinderMapperImpl.java:5)
        at androidx.databinding.DataBindingUtil.<clinit>(DataBindingUtil.java:32)
        at androidx.databinding.DataBindingUtil.inflate(DataBindingUtil.java:95)
        at com.algolia.instantsearch.ui.views.Hits$HitsAdapter.onCreateViewHolder(Hits.java:459)
        at com.algolia.instantsearch.ui.views.Hits$HitsAdapter.onCreateViewHolder(Hits.java:424)
        at androidx.recyclerview.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6794)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5975)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5858)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5854)
        at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2230)
        at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1557)
        at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1517)
        at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:612)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3924)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3641)
        at androidx.recyclerview.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java:1858)
        at androidx.recyclerview.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:5044)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1004)
        at android.view.Choreographer.doCallbacks(Choreographer.java:816)
        at android.view.Choreographer.doFrame(Choreographer.java:748)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:990)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6863)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.databinding.library.baseAdapters.DataBinderMapperImpl" on path

Bug: What is the expected behavior? Hits view loads with search results

[PLNech]

Hi again, thanks for starring the issue 🙂

We are going to release a new artifact refactored with androidX to unblock you until the bug is resolved. To avoid forcing our other customers to update, we’ll likely keep instantsearch-android on support.v7 while releasing a new instantsearch-androidx based on AndroidX that you’ll be able to use in your projects.

This situation with two different artifacts will be temporary, and will resolve as soon as:

• Google fixes the jetifier issue, allowing us to ship the initial support.v7 codebase for both support.v7 users and AndroidX users like you
• AndroidX becomes the norm and we can drop support of support.v7 package

When either one happens, we’ll delete the instantsearch-androidx artifacts and will be back to simply exposing instantsearch-android.

[PLNech]

Hi @sodle, thanks for your report and apologies for the hassle!

It is indeed due to AndroidX, it seems that the automatic migration tool has an issue with libraries depending on android.databinding which prevents using such libraries with AndroidX projects. I opened an issue on Google’s tracker, can you star it to show them you are affected which will help them prioritize this issue?

We are soon going to release alternate artifacts for AndroidX until the bug is resolved on Google’s side. I’ll keep you updated here as soon as an AndroidX release is available!