Exception java.lang.NoClassDefFoundError: Invalid descriptor: .

[ruslanPodurets]

Exception java.lang.NoClassDefFoundError: Invalid descriptor: .
at java.lang.Class.classForName
at java.lang.Class.forName (Class.java:454)
at java.lang.Class.forName (Class.java:379)
at org.greenrobot.eventbus.android.AndroidDependenciesDetector.isAndroidSDKAvailable (AndroidDependenciesDetector.java)
at org.greenrobot.eventbus.EventBus.register (EventBus.java)
at some app package name.AbstractActivity.onStart (AbstractActivity.java)
at android.app.Instrumentation.callActivityOnStart (Instrumentation.java:1435)
at android.app.Activity.performStart (Activity.java:8157)
at android.app.ActivityThread.handleStartActivity (ActivityThread.java:3537)
at android.app.servertransaction.TransactionExecutor.performLifecycleSequence (TransactionExecutor.java:221)
at android.app.servertransaction.TransactionExecutor.cycleToPath (TransactionExecutor.java:201)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState (TransactionExecutor.java:173)
at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2108)
at android.os.Handler.dispatchMessage (Handler.java:106)
at android.os.Looper.loop (Looper.java:223)
at android.app.ActivityThread.main (ActivityThread.java:7974)
at java.lang.reflect.Method.invoke
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:603)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:948)

---

Android 11 (SDK 30), Eventbus 3.3.1

[greenrobot-team]

Thanks for reporting! It appears the issue is at

EventBus/EventBus/src/org/greenrobot/eventbus/android/AndroidDependenciesDetector.java

Line 12 in 0194926

Class<?> looperClass = Class.forName("android.os.Looper");

Not sure why this will throw despite being run on Android though.