How to resolve ClassNotFoundException in Android Studio

Question

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

@SalmanKhan just try reseting the sdk path and then clean the project.restart studio and then try. — Jagjit Singh
– Jagjit Singh, Commented May 9, 2016 at 12:21
@JagjitSingh tried that solution but still facing the same problem. — Salman Khan
– Salman Khan, Commented May 10, 2016 at 4:27

Uriel Frankel · Accepted Answer · 2016-05-10 05:41:55Z

1

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.

edited May 10, 2016 at 5:41

answered May 9, 2016 at 14:59

Uriel Frankel

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9 Comments

Uriel Frankel Over a year ago

If not, I will delete my answer

Robert Over a year ago

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review

Uriel Frankel Over a year ago

I will write a full answer, if the path to resolve it is this.

Salman Khan Over a year ago

@UrielFrankel Thanks for the answer, I am trying it.

Uriel Frankel Over a year ago

I am glad it helped. That means that the error caused by the multi dex problem. The solution you did is written it the link. You should read the article i added.

|

Udi Reshef · Accepted Answer · 2021-10-26 15:54:51Z

0

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.

answered Oct 26, 2021 at 15:54

Udi Reshef

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Comments

Top-Master · Accepted Answer · 2022-05-06 11:37:35Z

0

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").

answered May 6, 2022 at 11:37

Top-Master

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