Mixpanel绑定上的java.lang.NoClassDefFoundError

Question

I'm trying to integrate Mixpanel into my Xamarin.Android project. But when I'm calling Com.Mixpanel.Android.Mpmetrics.MixpanelAPI.GetInstance() , java.lang.NoClassDefFoundError exception is thrown with message com/mixpanel/android/mpmetrics/MixpanelAPI .

I've just built MixpanelAPI.jar, then created "Android Java Bindings Library" project, added jar as InputJar (also tried EmbeddedJar), then built dll and imported it into my project.

jar tf MixpanelAPI.jar shows all classes, javap shows valid class interfaces. Assembly Browser also shows all classes. But when it comes to class_ref get , exception is thrown.

I can't get what I am doing wrong.

Stacktrace:

 [MonoDroid] UNHANDLED EXCEPTION: Java.Lang.NoClassDefFoundError: Exception of type 'Java.Lang.NoClassDefFoundError' was thrown. [MonoDroid] at Android.Runtime.JNIEnv.FindClass (string) [0x00087] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.0-branch/b76e8ec4/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.cs:287 [MonoDroid] at Android.Runtime.JNIEnv.FindClass (string,intptr&) [0x00014] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.0-branch/b76e8ec4/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.cs:300 [MonoDroid] at Com.Mixpanel.Android.Mpmetrics.MixpanelAPI.get_class_ref () [0x00000] in /path/to/mixpanel/bindings/project/Mixpanel/Mixpanel/obj/Release/generated/src/Com.Mixpanel.Android.Mpmetrics.MixpanelAPI.cs:1047 [MonoDroid] at Com.Mixpanel.Android.Mpmetrics.MixpanelAPI.GetInstance (Android.Content.Context,string) [0x00014] in /path/to/mixpanel/bindings/project/Mixpanel/Mixpanel/obj/Release/generated/src/Com.Mixpanel.Android.Mpmetrics.MixpanelAPI.cs:1199 

Mixpanel bindings (65 KB) and Test project for bindings (7 KB)

Answer 1

Right click on project and its intermeadiate project if any. Go to Properties->Java Build Path->Libraries-> The removed androied dependecies and android private libraries. Clean projects. It should remove classDefNotFound exception.

Answer 2

Sounds like the lib/jar you have generated is possibly referencing a class which is now not in scope. I would suggest revisiting the binding project to ensure that everything is being referenced correctly.