Question by mossibat · Jul 28, 2021 at 03:07 PM · android script.plugin java

How to solve java.lang.ClassNotFoundException ?

Hi there,

I tried this tutorial for creating a JAR library for my game. I kept everything simple but I can't find the problem here. Let me explain:

1- I created a JAR library named "MediaPlayerPlugin" with Android Studio, there is a class named "TutorialClass" in it with a simple log.

 package com.halluvision.mediaplayerlibrary;
 
 import android.util.Log;
 
 public class TutorialClass {
     public void LogNativeAndroidLogcatMessage(){
         Log.d("Unity", "Native Logcat Message!");
     }
 }

2- Put the JAR file in "Assets/Plugins/Android" path in and empty unity project.

3- Created a script and gameObject in my scene:

 using UnityEngine;
 
 public class PluginWrapper : MonoBehaviour
 {
     private AndroidJavaObject javaClass;
 
     void Start()
     {
         javaClass = new AndroidJavaObject("com.halluvision.mediaplayerlibrary.TutorialClass");
         javaClass.Call("LogNativeAndroidLogcatMessage");
     }
 }

4- Build and run my project in my Poco F1 phone with android 11.

Result: The Logcat shows this error on Start:

 2021-07-28 19:17:27.616 31888-31928/com.Halluvision.MediaPlayerTutorial E/Unity: AndroidJavaException: java.lang.ClassNotFoundException: com.halluvision.mediaplayerlibrary.TutorialClass
     java.lang.ClassNotFoundException: com.halluvision.mediaplayerlibrary.TutorialClass
         at java.lang.Class.classForName(Native Method)
         at java.lang.Class.forName(Class.java:454)
         at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
         at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0)
         at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95)
         at android.os.Handler.dispatchMessage(Handler.java:103)
         at android.os.Looper.loop(Looper.java:224)
         at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20)
      Caused by: java.lang.ClassNotFoundException: Didn't find class "com.halluvision.mediaplayerlibrary.TutorialClass" on path: DexPathList[[zip file "/data/app/com.Halluvision.MediaPlayerTutorial-8TdElXhtpVKNJfGodSFsDg==/base.apk"],nativeLibraryDirectories=[/data/app/com.Halluvision.MediaPlayerTutorial-8TdElXhtpVKNJfGodSFsDg==/lib/arm, /data/app/com.Halluvision.MediaPlayerTutorial-8Td

So can you help me to find out why my plugin is not recognized on build?

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