Develop Reference

AWS Amplify Crashes on Android 6

I'm trying to use AWS amplify on android 6, but the app crashes suddenly after 30 seconds after the Configuration and gets this error.
java.lang.NoClassDefFoundError: Failed resolution of: Ljava/time/LocalDateTime;
at com.amplifyframework.devmenu.PersistentLogger.addToLogs(PersistentLogger.java:116)
at com.amplifyframework.devmenu.PersistentLogger.debug(PersistentLogger.java:88)
at com.amplifyframework.logging.BroadcastLogger.debug(BroadcastLogger.java:101)
at com.amplifyframework.analytics.pinpoint.AutoEventSubmitter.lambda$new$0$AutoEventSubmitter(AutoEventSubmitter.java:44)
at com.amplifyframework.analytics.pinpoint.-$$Lambda$AutoEventSubmitter$kRbNZmP2XU9xJOUcrfJ3PKgcA28.run(lambda)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.os.HandlerThread.run(HandlerThread.java:61)
Caused by: java.lang.ClassNotFoundException: Didn't find class "java.time.LocalDateTime" on path: DexPathList[[zip file "/data/app/com.nowpay.nowpay-1/base.apk"],nativeLibraryDirectories=[/data/app/com.nowpay.nowpay-1/lib/arm, /data/app/com.nowpay.nowpay-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at com.amplifyframework.devmenu.PersistentLogger.addToLogs(PersistentLogger.java:116) 
at com.amplifyframework.devmenu.PersistentLogger.debug(PersistentLogger.java:88) 
at com.amplifyframework.logging.BroadcastLogger.debug(BroadcastLogger.java:101) 
at com.amplifyframework.analytics.pinpoint.AutoEventSubmitter.lambda$new$0$AutoEventSubmitter(AutoEventSubmitter.java:44) 
at com.amplifyframework.analytics.pinpoint.-$$Lambda$AutoEventSubmitter$kRbNZmP2XU9xJOUcrfJ3PKgcA28.run(lambda) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.os.HandlerThread.run(HandlerThread.java:61) 
Suppressed: java.lang.ClassNotFoundException: java.time.LocalDateTime
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 10 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

The basic problem here is that the app is trying to reference a class which doesn't exist at runtime:
java.lang.ClassNotFoundException: Didn't find class "java.time.LocalDateTime"
Initial runtime support for java.time.* was added to Android in API Level 26. For a period of time, java.time.* only worked on these devices.
As of Android Studio 4, java.time.* APIs can be "de-sugared" at build time. When using this functionality, the resulting code will run on all versions of Android. To benefit from this support, you must have Android Studio 4 or higher, and enable "core library desugaring." See the documentation for more details: https://developer.android.com/studio/write/java8-support#library-desugaring

android debug apk crashing but release apk run successfully

While running apk from android studio via adb it is working/running properly. but when i am giving that debug apk to my client it is crashing. but when i am giving signed apk it is working fine.
The debug apk installed successfully but when it going to run then it get "class not found error".
09-19 20:05:12.065 29019-29019/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.volansys.homebridge, PID: 29019
java.lang.RuntimeException: Unable to instantiate application com.volansys.homebridge.HomeBridgeApplication: java.lang.ClassNotFoundException: Didn't find class "com.volansys.homebridge.HomeBridgeApplication" on path: DexPathList[[zip file "/data/app/com.volansys.homebridge-2/base.apk"],nativeLibraryDirectories=[/data/app/com.volansys.homebridge-2/lib/arm, /system/lib, /vendor/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:802)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5376)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1541)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.volansys.homebridge.HomeBridgeApplication" on path: DexPathList[[zip file "/data/app/com.volansys.homebridge-2/base.apk"],nativeLibraryDirectories=[/data/app/com.volansys.homebridge-2/lib/arm, /system/lib, /vendor/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.Instrumentation.newApplication(Instrumentation.java:1014)
at android.app.LoadedApk.makeApplication(LoadedApk.java:796)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5376) 
at android.app.ActivityThread.-wrap2(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1541) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6123) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757) 
i also changed the manifest file and gave the whole path to the application class like
android:name="package_name.HomeBridgeApplication"
When i going to ctrl+click on this class it can navigate to this class. it means path is proper so why i am getting class not found error ?
can anyone help me ?
Thanks in Advance.

MultiDex issue: java.lang.ClassNotFoundException: Didn't find class on path: DexPathList

I am facing an issue with my app:
If I deactivate within Android Studio Instant Run, my app crashes upon startup with the stacktrace:
12-29 13:36:37.876 4549-4549/com.mycoolapp.debug E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mycoolapp.debug, PID: 4549
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.mycoolapp.debug/com.myapp.SplashScreenActivity}: java.lang.ClassNotFoundException: Didn't find class "com.myapp.SplashScreenActivity" on path: DexPathList[[zip file "/system/framework/android.test.runner.jar", zip file "/data/app/com.mycoolapp.debug-2/base.apk"],nativeLibraryDirectories=[/data/app/com.mycoolapp.debug-2/lib/arm, /vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2216)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
at android.app.ActivityThread.access$800(ActivityThread.java:148)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5272)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:909)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.myapp.SplashScreenActivity" on path: DexPathList[[zip file "/system/framework/android.test.runner.jar", zip file "/data/app/com.mycoolapp.debug-2/base.apk"],nativeLibraryDirectories=[/data/app/com.mycoolapp.debug-2/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365) 
at android.app.ActivityThread.access$800(ActivityThread.java:148) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5272) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:909) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704) 
Suppressed: java.lang.NoClassDefFoundError: com.myapp.SplashScreenActivity
at dalvik.system.DexFile.defineClassNative(Native Method)
at dalvik.system.DexFile.defineClass(DexFile.java:226)
at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
at dalvik.system.DexPathList.findClass(DexPathList.java:321)
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
... 14 more
Suppressed: java.lang.ClassNotFoundException: com.myapp.SplashScreenActivity
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 13 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
As far as I have researched this belongs to multidex:
https://developer.android.com/studio/build/multidex.html
Even if I add the multiDexEnabled property to my gradle config the app crashes. Only if I enable InstantRun (which enables multidex in background), the app runs...
If I create an apk the installation works, but the app crashes on startup with the same error.
Since I have as minSDK API Level 21, there should be no other change except of the multiDexEnabled property necessary, right?

So last but not least my answer:
All my configuration for multidex was correct... I don't know why, but after a complete OS restart everything works fine now... :)

Just create new phone on AVD and try to install app on that phone. Hope it will work.

The accepted answer was only a temporary fix for me, after altering code and a few builds the error came back.
After alot of trial and error the real problem was the jdk location my project was using, instead of using the embedded jdk in android studio i was using an installed version from oracle. After going to File > Project Structure > SDK Location and checking Use embedded JDK the problem was fixed for good.

Check if your classpath
'com.android.tools.build:gradle:3.1.0-alpha05'
is up-to-date, had same problem and solved it with a full update.

How to resolve ClassNotFoundException in Android Studio

I have recently migrated my project from Eclipse to Android Studio. Earlier everything was working perfectly, but recently when I started working on it again I am not able to launch the application. Its always showing me the same error. I haven't changed anything on application level, still getting the same result. Here is the log I am getting
FATAL EXCEPTION: main
Process: com.example.android, PID: 6977
java.lang.RuntimeException: Unable to instantiate application com.example.android.MobApplication: java.lang.ClassNotFoundException: Didn't find class "com.example.android.MobApplication" on path: DexPathList[[zip file "/data/app/com.example.android-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:601)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4919)
at android.app.ActivityThread.access$1500(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1424)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5721)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.android.MobApplication" on path: DexPathList[[zip file "/data/app/com.example.android-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newApplication(Instrumentation.java:986)
at android.app.LoadedApk.makeApplication(LoadedApk.java:587)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4919)
at android.app.ActivityThread.access$1500(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1424)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5721)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)
Suppressed: java.lang.ClassNotFoundException: com.example.android.MobApplication
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 13 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
As I have recently switched my IDE I am facing problems to solve this one. I have also tried the other answers but still unable to solve this error. Kindly help me with this so I can proceed with my project.
Any help would be appreciable.
Thanks

This might be the 65k methods limit. Try to use the solutions in the link.
Edit: For others who stumble this issue - #Salman Khan added multiDexEnabled true to the gradle file (as written in the link) and it solved the problem. It would be still better to read the whole article and follow the steps there.

Replaced lambda with anonymous class:
java.lang.ClassNotFoundException happened in my android studio project in two classes – in both of them there was lambda expressions. After I replaced lambda with anonymous class – the build was successful.

In my case, I needed to edit from:
String id = MyClass.class.toString();
Into:
String id = MyClass.class.getName();
Because .toString() returns something like "class mypackage.MyClass" (instead of "mypackage.MyClass").

NoClassDefFoundError attempting to use FatSecret REST API in Android Studio

I am using the FatSecretAPI in order to retreive items from their database.
I have used this library - http://ranesr.github.io/fatsecret4j/ and done the following:
Created a new module in Android Studio as a new Java Library
Copied the relevant java files across as per the structure provided in the link
Located File > Project Structure... > Modules > my app > Dependencies and added the fatsecret module as a dependency
Called the FatSecretAPI class and instantiated with both my keys as per:
FatSecretAPI api = new FatSecretAPI("my auth key", "my shared key");
Cleaned and Rebuilt the project.
Upon running the app and opening the activity this call is in, I get the following error:
FATAL EXCEPTION: main
Process: com.example.chris.rapical, PID: 7140
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/fatsecret/platform/FatSecretAPI;
at com.example.chris.rapical.FoodSearchOnlineActivity.onCreate(FoodSearchOnlineActivity.java:51)
at android.app.Activity.performCreate(Activity.java:6500)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1120)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3072)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3218)
at android.app.ActivityThread.access$1000(ActivityThread.java:198)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1676)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6837)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.fatsecret.platform.FatSecretAPI" on path: DexPathList[[zip file "/data/app/com.example.chris.rapical-1/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at com.example.chris.rapical.FoodSearchOnlineActivity.onCreate(FoodSearchOnlineActivity.java:51) 
at android.app.Activity.performCreate(Activity.java:6500) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1120) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3072) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3218) 
at android.app.ActivityThread.access$1000(ActivityThread.java:198) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1676) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:145) 
at android.app.ActivityThread.main(ActivityThread.java:6837) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199) 
Suppressed: java.lang.ClassNotFoundException: com.fatsecret.platform.FatSecretAPI
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 15 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
Things I have tried:
Cleaning and rebuilding the app
Deleting the /class folder and re-building
Running 'gradlew clean' on CMD at project location
All 3 have no successs.

Figured it out - When I was going to create the new Module, I selected Java library instead of Android library. Duh.