Didn't find class "androidx.core.app.CoreComponentFactory"

Question

I don't know what to do about the following errors, I've searched the web but not found anything:

java.lang.ClassNotFoundException: Didn't find class "androidx.core.app.CoreComponentFactory" on path: DexPathList[[],nativeLibraryDirectories=[/data/app/com.example.padmw-CXElJ_vfrfm3y7py3CPsJw==/lib/x86, /system/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at android.app.LoadedApk.createAppFactory(LoadedApk.java:226)
    at android.app.LoadedApk.updateApplicationInfo(LoadedApk.java:338)
    at android.app.ActivityThread.handleDispatchPackageBroadcast(ActivityThread.java:5388)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1733)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:193)
    at com.android.server.SystemServer.run(SystemServer.java:454)
    at com.android.server.SystemServer.main(SystemServer.java:294)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:838)

and :

2019-08-29 00:19:24.071 1853-1853/? E/LoadedApk: Unable to instantiate appComponentFactory
java.lang.ClassNotFoundException: Didn't find class "androidx.core.app.CoreComponentFactory" on path: DexPathList[[],nativeLibraryDirectories=[/data/app/com.example.padmw-CXElJ_vfrfm3y7py3CPsJw==/lib/x86, /system/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at android.app.LoadedApk.createAppFactory(LoadedApk.java:226)
    at android.app.LoadedApk.updateApplicationInfo(LoadedApk.java:338)
    at android.app.ActivityThread.handleDispatchPackageBroadcast(ActivityThread.java:5388)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1733)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:193)
    at com.android.server.SystemServer.run(SystemServer.java:454)
    at com.android.server.SystemServer.main(SystemServer.java:294)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:838)

my dependencies in gradle app :

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'com.google.firebase:firebase-core:17.1.0'
implementation 'com.google.firebase:firebase-database:19.0.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'com.google.android.material:material:1.0.0'
implementation 'androidx.navigation:navigation-fragment:2.0.0'
implementation 'androidx.navigation:navigation-ui:2.0.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation 'androidx.recyclerview:recyclerview:1.0.0'
implementation 'com.squareup.picasso:picasso:2.71828'
implementation 'androidx.cardview:cardview:1.0.0'
implementation 'com.firebaseui:firebase-ui-database:1.2.0'
}
apply plugin: 'com.google.gms.google-services'

Possible duplicate of [After migration to AndroidX, exception at start up: java.lang.ClassNotFoundException: "Didn't find class androidx.core.app.CoreComponentFactory"](https://stackoverflow.com/questions/56252142/after-migration-to-androidx-exception-at-start-up-java-lang-classnotfoundexcep) — mike47, Nov 13 '19 at 21:31
Probably it happened after upgrade of some libraries (added JUnit and updated Firebase), but after recompilation it disappeared. — CoolMind, May 28 '20 at 07:34
A picture is worth of 1000 words---Here are the details solution works in my case maybe yours too-- [Before error](https://i.stack.imgur.com/vDEoZ.png) [After fix](https://i.stack.imgur.com/P7F0p.png) — Abhimanyu Kumar Roy, Aug 17 '20 at 05:53

score 37 · Answer 1 · edited Mar 26 '21 at 16:40

37

Adding Java 1.8 compatibility to my module-level build.gradle fixed this for me (non-release build with multidex enabled).

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
    jvmTarget = "1.8"
}

Unfortunately I'm not sure why :)

edited Mar 26 '21 at 16:40

Ky.

28,753
48
180
285

answered Dec 12 '19 at 01:05

Tom

6,110
1
40
59

This worked for me. For more info, check here: https://stackoverflow.com/a/52561908 – Anky An Jan 08 '20 at 01:43
project- or app-level `build.gradle`? – Ky. Mar 24 '21 at 16:09
2

Module level @Ben – Tom Mar 25 '21 at 19:17

Martin Zeitler · Answer 2 · 2021-01-31T17:40:07.073

11

This error message is caused on API level 28+ by:
AppComponentFactory extends android.app.AppComponentFactory

This means that on API 28+ one can use tools:remove ...

tools:remove="android:appComponentFactory"
tools:targetApi="p"

edited Jan 31 '21 at 17:40

answered Jan 31 '21 at 14:09

Martin Zeitler

59,798
15
122
186

1

Just adding the first line in the Manifest file did it for me. – mir Feb 17 '21 at 02:40

score 8 · Answer 3 · answered Apr 07 '20 at 06:19

8

In my case, the code works on one of my teammates' machine. These steps made it work for me too:

Close project
Remove the project from the list in the welcome screen
Open the project again

This is a solution to another problem, that I also found here in SO. It's worth a try when Invalidate and Restart doesn't solve it for you.

answered Apr 07 '20 at 06:19

Aguragorn

545
5
14

3

Wow. Can't believe that solved my problem. It's also solved the problem of the debugger disconnecting a second after it hit a breakpoint. – bickster Aug 01 '20 at 15:11

Tomasz · Answer 4 · 2020-12-29T20:14:37.450

4

It may sound totally unrelated, but I have seen this problem also when by mistake I have overridden wrong on Activity#onCreate() method i.e.

public void onCreate(@Nullable Bundle savedInstanceState,
        @Nullable PersistableBundle persistentState)

Instead of

protected void onCreate(@Nullable Bundle savedInstanceState)

So, please check that also. The second one is the one that you probably need.

Please refer to documentation for the details of these two methods.

edited Dec 29 '20 at 20:14

answered Apr 02 '20 at 06:47

Tomasz

51
4

1

It seems to have been the answer of @Tomasz but then I add to `File > Sync Project with Gradle Files` to get it working. For interested ones, I found `Sync project with Gradle before building, if needed` in `Settings > Build, Execution, Deployment > Compiler`. – eytienne Mar 19 '21 at 14:20

PerracoLabs · Answer 5 · 2019-10-02T15:24:47.417

2

Seems to be a bug, check the next link in the issue tracker:

https://issuetracker.google.com/issues/137646829

edited Oct 02 '19 at 15:24

answered Oct 02 '19 at 10:10

PerracoLabs

14,608
13
66
119

This can occur with non-release builds as well so it's not the whole story – Tom Jul 01 '20 at 19:35

score 1 · Answer 6 · answered Jun 17 '20 at 10:45

See java.lang.ClassNotFoundException: Didn't find class "com.my_app_name.androidx".

Remove from AndroidManifest:

<application
    ...
    android:appComponentFactory="androidx"
    tools:replace="android:appComponentFactory"
>

These lines appeared a year ago after migrating to AndroidX. I removed them, now it doesn't show the exception.

score 1 · Answer 7 · answered May 24 '21 at 13:33

For Xamarin folks running into this problem: I started to see this problem when upgrading from Xamarin.Forms 4.x to 5.0. With AndroidX changes that I wasn't aware when I've done the upgrade the min SDK version needs to be changed to 29 on the android manifest file, something like: <uses-sdk android:minSdkVersion="29" android:targetSdkVersion="30" />

score 0 · Answer 8 · answered Jan 20 '21 at 20:15

0

If you are using an emulator, try the wipe data option. This worked for me.

answered Jan 20 '21 at 20:15

CosminPetrescu

13
4

score 0 · Answer 9 · answered Jul 17 '21 at 17:20

0

In my case, I was using a library that has an interface that was inheriting a View.OnClickListener interface.

answered Jul 17 '21 at 17:20

Kristy Welsh

7,145
11
58
95

Could you expand on why this is relevant? I think it would be quite common for classes to inherit View.OnClickListener - if so, is there a work around without having to stop inheriting this class? – JCutting8 Mar 02 '22 at 19:43

score -2 · Answer 10 · answered Sep 29 '19 at 15:24

-2

In my case ,that was because of a little mistake in one of my layouts.

I removed one > at the end of a view tag accidentlly.

Check your

xml

files.

answered Sep 29 '19 at 15:24

Zima

136
2
13

mike47 · Answer 11 · 2019-12-08T20:01:04.650

-2

After reviewing the Android Issue Tracker bug report mentioned previously, I saw a mention about multidex support. I had no multidex flags specified in my project, so I tried setting the flag to false on all modules in my project, and the exception went away.

This was not a permanent solution; the problem returned a few builds later.

edited Dec 08 '19 at 20:01

answered Nov 12 '19 at 23:34

mike47

2,090
1
24
46

Unfortunately, I have to set multidex to true because of my app size. – FractalBob Nov 22 '19 at 07:43

score -3 · Answer 12 · answered Aug 28 '19 at 22:05

-3

add below code to gradle.properties

android.enableJetifier=true
android.useAndroidX=true

or you can choose migrate to androidX in refactor -> Migrate to androidX.

answered Aug 28 '19 at 22:05

Mohammad Mahdi Heidari

45
1
8

score -3 · Answer 13 · answered Dec 26 '19 at 09:05

-3

In my case, add android.enableR8=false in the gradle.properties.

answered Dec 26 '19 at 09:05

jack

366
2
5

Thank you, my issue is solved after adding this line – Mohamed Hussien Feb 02 '20 at 13:11
3

@MohamedHussien it's not good solution, your turn off obfuscation – Nikolay Mar 30 '20 at 14:15

score -7 · Answer 14 · answered Sep 21 '19 at 15:28

did u create fragments? ok if you create fragments with classes and after that you have to create a class to call those fragments. and if you use switch this cane be like this

`public Fragment getItem(int i) {

    // you have create a switch to get positions using i.
    switch (i) {
        case 0:
            ChatsFragment chatsFragment = new ChatsFragment();
            return chatsFragment;

        case 1:
            GroupsFragment groupsFragment = new GroupsFragment();
            return groupsFragment;

        case 2:
            ContactsFragment contactsFragment = new ContactsFragment();
            return contactsFragment;
        default:
            return null;
    }

}

@Override
public int getCount() {
    return 3;//error can be happen if u use default 0, use fragment counts in here.
}`

in this case you can see 3 cases in switch and the public int getCount() the return value should be 3 not default value 0.

See your error must be close to this one. i got same kind of error and i solved it.

Didn't find class "androidx.core.app.CoreComponentFactory"

14 Answers14

Linked

Related