AndroidJavaException: java.lang.ClassNotFoundException (Another One)

Sorry if this has been answered before, but I couldn't find anything that helped me.

I'm trying to create a unity project to Interact with an Epson Movario headset but I'm having some trouble accessing its java SDK within unity as I need more hardware access than the movario unity plugin will give me.

Ok, here's my logcat file. (trimmed, of course)

I/Unity   ( 7171): Step 01

I/Unity   ( 7171):

I/Unity   ( 7171): (Filename: ./artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)

I/Unity   ( 7171):

I/Unity   ( 7171): AndroidJavaException: java.lang.ClassNotFoundException: com.epson.moverio.btcontrol.Bt3sCustomKey

I/Unity   ( 7171): java.lang.ClassNotFoundException: com.epson.moverio.btcontrol.Bt3sCustomKey

I/Unity   ( 7171):      at java.lang.Class.classForName(Native Method)

I/Unity   ( 7171):      at java.lang.Class.forName(Class.java:306)

I/Unity   ( 7171):      at java.lang.Class.forName(Class.java:270)

I/Unity   ( 7171):      at com.unity3d.player.UnityPlayer.nativeRender(Native Method)

I/Unity   ( 7171):      at com.unity3d.player.UnityPlayer.a(Unknown Source)

I/Unity   ( 7171):      at com.unity3d.player.UnityPlayer$c$1.handleMessage(Unknown Source)

I/Unity   ( 7171):      at android.os.Handler.dispatchMessage(Handler.java:98)

I/Unity   ( 7171):      at android.os.Looper.loop(Looper.java:135)

I/Unity   ( 7171):      at com.unity3d.player.UnityPlayer$c.run(Unknown Source)

I/Unity   ( 7171): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.epson.moverio.btcontrol.Bt3sCustomKey" on path: DexPathList[[zip file "/data/app/com.Accenture.Epson_Online_Test-1/base.apk"],nativeLibraryDirectories=[/data/app/com.Accenture.Epson_Online_Test-1/lib/arm, /vendor/lib, /system/lib]]

I/Unity   ( 7171):      at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:

Package: com.epson.moverio.btcontrol.
Class Bt3sCustomKey.

My unity code:

Code (CSharp):

1. #if UNITY_ANDROID
2.         AndroidJavaObject activityContext = null;
3.         AndroidJavaObject bt3sCustomKey = null;
4.  
5.         // First, obtain the current activity context
6.         using (AndroidJavaClass activityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
7.         {
8.             activityContext = activityClass.GetStatic<AndroidJavaObject>("currentActivity");
9.         }
10.  
11.         Debug.Log("Step 01");
12.         using (AndroidJavaClass pluginClass = new AndroidJavaClass("com.epson.moverio.btcontrol.Bt3sCustomKey"))
13.         {
14.             Debug.Log("Step 02");
15.             if (pluginClass != null)
16.             {
17.                  Debug.Log("Step 03");
18.                  bt3sCustomKey = pluginClass.CallStatic<AndroidJavaObject>("Bt3sCustomKey", activityContext);
19.                  Debug.Log("Step 04");
20.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(DPAD_UP, false));
21.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(DPAD_DOWN, false));
22.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(DPAD_LEFT, false));
23.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(DPAD_RIGHT, false));
24.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(DPAD_CENTER, false));
25.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(VOLUME_UP, false));
26.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(VOLUME_DOWN, false));
27.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(FUNCTION, false));
28.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(BACK, false));
29.                  bt3sCustomKey.Call("setKeyEnable", makeParamList(HOME, false));
30.             }
31.         }
32. #endif

I've been searching all day for an answer to this problem, and I'm at my wits end! Can anyone provide any help?!?! (My issue IS NOT the 'JNI Init'd AndroidJavaClass with null ptr!' error, I know it doesn't work in the editor!)

The BT300Ctrl.jar file is located in 'Assets > Plugins > Android' and if anyone wants it, here's the code from the jar file. (With the machine code bits removed to save space.) I Can't change the java code.

Code (CSharp):

1. public class Bt3sCustomKey {
2.     public static final int DPAD_UP = 19;
3.     public static final int DPAD_DOWN = 20;
4.     public static final int DPAD_LEFT = 21;
5.     public static final int DPAD_RIGHT = 22;
6.     public static final int DPAD_CENTER = 23;
7.     public static final int VOLUME_UP = 24;
8.     public static final int VOLUME_DOWN = 25;
9.     public static final int FUNCTION = 119;
10.     public static final int BACK = 4;
11.     public static final int HOME = 3;
12.     public static final int APP_SWITCH = 187;
13.     public static final int POWER = 26;
14.     private static String TAG;
15.     private static final String BT3S_CUSTOM_KEY_ASSIGN = "Bt3s.CustomkeyAssign";
16.     private static final String BT3S_CUSTOM_KEY_ENABLE = "Bt3s.CustomkeyEnable";
17.     private static final String BT3S_CUSTOM_KEY_RESET = "Bt3s.CustomkeyReset";
18.     private static HashMap<Integer, String> mPhyKeyMap;
19.     private static HashMap<Integer, String> mKeyCode;
20.     private android.content.Context mContext;
21.  
22.     public Bt3sCustomKey(android.content.Context context) {
23.         // <editor-fold defaultstate="collapsed" desc="Compiled Code">
24.     }
25.  
26.     public boolean setKeyAssign(int PhyKey, int KeyCode) {
27.         // <editor-fold defaultstate="collapsed" desc="Compiled Code">
28.     }
29.  
30.     public int getKeyAssign(int PhyKey) {
31.         // <editor-fold defaultstate="collapsed" desc="Compiled Code">
32.     }
33.  
34.     public boolean isKeyEnable(int PhyKey) {
35.         // <editor-fold defaultstate="collapsed" desc="Compiled Code">
36.     }
37.  
38.     public boolean setKeyEnable(int PhyKey, boolean enableKey) {
39.         // <editor-fold defaultstate="collapsed" desc="Compiled Code">
40.     }
41.  
42.     public void resetToDefault() {
43.         // <editor-fold defaultstate="collapsed" desc="Compiled Code">
44.     }
45. }

 

Thanks for replying, but it already is.

 

Internal.

 

Ok, I've solved this issue now.

I changed the .jar file to a different version and I no longer get this error. (I now get another issue, which will be posted about shortly.)

Thanks for the replies!

 

Very good ;( fix issue and not explain to others how it fix.

 

Its cause of Obfuscation. Goto Player Setting > Publishing Setting > Minify and select none for Release.

 

Thanks AppDevPareeta. Searched for this problem for 2 hours, and this new "Minify" setting is the answer. It obfuscated Java classes that need original names!

 

@AppDevPareeta you are life SAVER thank you, your solution work for me

 

thanks

 

Im getting same error please help

 

Man, you saved many lives

 

Thank you! That really helped! Spent 4 hours digging whole Internet - finally Google took me here. However, checking now the answer by @JuliusM, as this definitely looks like the fix that needs to be applied for a long-run solution.

 

As the name suggests this exception in Java occurs when JVM tries to load a particular class and doesn't found the requested class in the classpath you specified. This means that, your classpath is broken. Java ClassNotFoundException thrown when an application tries to load in a class through its string name using:

• The forName method in class Class.
• The findSystemClass method in class ClassLoader .
• The loadClass method in class ClassLoader.

When you get a ClassNotFoundException , it means that the Java Virtual Machine has traversed the entire classpath you specified and not found the class you've attempted to reference. The one and only solution is to check your classpath carefully.

Verify the name of the requested class is correct and the specified .jar file exists in your classpath. If not, you must explicitly add it to your application’s classpath.

If it's present in your classpath then there is high chance that your classpath is getting overridden or application is using classpath specified in jar file or start-up script and to fix that you need to find the exact classpath used by your application.

 

Will you Marry me?

 

In my case Minify was already "None" and proguard keep options or any Minify option didn't help.

I was able resolve it by moving the plugin from

Assets/Plugins/Android/MyPlugin/myplugin.aar

to

Assets/Plugins/Android/libs/MyPlugin/myplugin.aar

.

 

thank you, for me it was Debug.

 

This worked for me, just wanted to add Visual to help people find this solution. @AppDevPareeta -Thank''s