Java.Lang Class Not Found (ReviewManagerFactory) - Solution Found

Unity Engine
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1

I JUST found the solution to this issue, but given my 2 straight days of troubleshooting and lack of answers online, I am posting this as a record for anybody else with the same problem.

I was trying to implement In-App Reviews for Android and kept getting the following error:

My Error: java.lang.ClassNotFoundException: com.google.android.play.core.review.ReviewManagerFactory

This error was fixed once I deleted Unity’s Advertisement Legacy Package.

Once I redownloaded the Advertisement Legacy Package, the error began popping up again.

Now below was my initial error write-up (if helpful).

I am trying to implement In-App Reviews for Android.

Error: java.lang.ClassNotFoundException: com.google.android.play.core.review.ReviewManagerFactory

This keeps occuring trying to implement In-App Reviews for Android in Unity. I have been troubleshooting for 2 days and have exhausted all possible solutions I could find.

Any guidance would be great appreciated as I am out of rabbit holes to chase down.

Testing Notes:

- Unity Version: 2021.3.15f1(Silicon, LTS).
- Device Tested On: Pixel 2 (Android Version 11)

  • Testing Environments: Google Play Closed Testing. Google Player Internal Testing.
  • Minify: Not being used

Troubleshooting Attempts:

  • Downloaded Unity com.google.play.review (1.8.1) directly.
  • Tested older packages (1.7.0). Same error
  • Downloaded all .tgz packages seperately. Same error.
  • Set Custom Proguard file with these rules referenced from this Github Thread on missing class com.google.android.play.core.review.b. Same error.
  • Added Proguard references to the “proguard-unity.txt” to ensure Proguard rules were being brought in from the com.google.play.core and com.google.play.review libraries.
  • Built a Custom Gradle to ensure implementation of Play.Core and Play.Review libraries.
  • Tried a different Google account.
  • Various combinations of all the above.

Logcat Error:

04-20 09:22:22.785 9773 9795 E Unity : AndroidJavaException: java.lang.ClassNotFoundException: com.google.android.play.core.review.ReviewManagerFactory
04-20 09:22:22.785 9773 9795 E Unity : java.lang.ClassNotFoundException: com.google.android.play.core.review.ReviewManagerFactory
04-20 09:22:22.785 9773 9795 E Unity : at java.lang.Class.classForName(Native Method)
04-20 09:22:22.785 9773 9795 E Unity : at java.lang.Class.forName(Class.java:454)
04-20 09:22:22.785 9773 9795 E Unity : at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
04-20 09:22:22.785 9773 9795 E Unity : at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0)
04-20 09:22:22.785 9773 9795 E Unity : at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95)
04-20 09:22:22.785 9773 9795 E Unity : at android.os.Handler.dispatchMessage(Handler.java:102)
04-20 09:22:22.785 9773 9795 E Unity : at android.os.Looper.loop(Looper.java:223)
04-20 09:22:22.785 9773 9795 E Unity : at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20)
04-20 09:22:22.785 9773 9795 E Unity : Caused by: java.lang.ClassNotFoundException: com.google.android.play.core.review.ReviewManagerFactory
04-20 09:22:22.785 9773 9795 E Unity : … 8 more
04-20 09:22:22.785 9773 9795 E Unity : at UnityEngine.AndroidJNISafe.CheckException () [0x00000] in <00000000000000000000000000000000>:0
04-20 09:22:22.785 9773 9795 E Unity : at UnityEngine.AndroidJNISafe.FindClass (System.String name) [0x00000] in <00000000000000000000000000000000>:0
04-20 09:22:22.785 9773 9795 E Unity : at UnityEngine.AndroidJavaClass._And

2

Hi, I don’t have the Unity’s Advertisement Legacy Package installed and I still get this exact issue.

3

I’ve started having this issue too. But only for some apps. Hmm