No class found exception android

Android ClassNotFoundException: Didn’t find class on path

I can’t find the solution of this error. Can you please give the permanent solution? I have no idea how to solve it.

This is my app Manifest XML

I’m not sure what’s wrong here. I’ve added the .jar file in the java build path. And yet I’m getting this classnotfound exception. The app loads when I import the android.app.Application

13 Answers 13

I have solved this problem by disabling the instant run option of android studio. To disable Instant Run Goto File -> Settings -> Build,Execution, Deployment -> Instant Run -> Uncheck the checkbox for instant run

I don’t know for sure what is your package name, but if it is e.gochat do this.

Add package=»e.gochat» to manifest.xml

On each activity declaration for android:name put a dot before activity name:

EDIT

After your edited I can see e.gochat is your package name.
Now you only need to remove e.gochat from each activity/provider/receiver name as I said in second part of my answer.
Android will add that for you.

Using Android Studio

After upgrading to Android Stuido 0.8.2, I had this problem. I tried a lot of things, including

• Clean project
• Clean project (gradle clean)
• Invalidate Caches and Restart
• De-qualify the Activity Name in AndroidManifest.xml (.MyActivity)

Nothing worked until I re-imported the entire project.

File -> Close Project -> Import Project. -> Choose the same project -> OK

This fixed it for me

Uninstalling the app in the device and running the project again fixed it for me.

The reason why this was affecting me was due to an incorrect path name in a layout file

The correct absolute path of ViewPager is

After correcting the path it worked. I did not have to prefix the activity name with a ‘.’.

For me, this was occurring on devices running

The problem was solved by removing MultiDexSupport from build.gradle file :

Removing the MultiDexSupport solved the problem

This issue has multiple answers based on the different scenario. I was getting the same error when using a library(.aar) in my Android Studio project.

The root cause in my case was that I missed to add a third party lib dependency in app’s build.gradle file which was being used by the .aar file.

e.g:- The library(.aar) was using ‘com.squareup.okhttp3:okhttp:3.4.1’. So I had to add

in the app’s build.gradle. Hope it helps someone.

ANDROID STUDIO In addittion to Kishor’s answer:

The error occured on my small project when I enabled multiDexEnabled = true in the gradle defaultconfig. Using the generated .apk file crashes on start of the app with the known error message.

For me it was solved when I built the .apk file via gradle (right side of android studio) -> «yourapp» -> Tasks- > install -> installDebug

Hope this helps someone with this strange error

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Android ClassNotFoundException

I am having a problem with one of my apps and I was wondering if anyone could give me any insight into what maybe causing it.

I am getting a ClassNotFoundException, the important line below is

Now this app has been out for over a year and 2 days ago I had two seperate users contact me regarding this issue, one on a HTC wildfire (2.1) and one a Samsung Galaxy S (?). Now I cannot recreate this problem on my devices (2.2 and 1.6) or an emulator (2.1) and cannot really work out why this class cannot be found by the classloader. I have spent a while googling to no avail, and hopes someone has some pointers! It only seems to be when an activity is loaded which when the contentView is set, it tries to inflate a custom View called GoBoardView which extends the View class, this is just doing some simple canvas drawing and is not using any third party libs or any other classes that would have a packagename clash or anything.

Please help! Just in case its a build issue I am updating all my SDK and ADT through eclipse as it was building against 1.6 and using the old ADT, but I have no idea if this will help just thought worth a try. Any advice would be great thanks! (see below for EDIT)

EDIT

Ok, researching some of the links that users to have commented in reply to this question, it seems that the use of the wrong context for loading activities can cause this problem. I find this interesting becuase one of the two log reports i have been send has this exception preceeded by

which is quite self explanatory — problem is i have no idea where this activity could be being started from where it uses a non activity context, so im a bit stumped, thinking it maye be some multitasking like quirk and its being brought back into the foreground of something . This can then apparently cause problems with the classLoader. If this was happening on a users phone i cant see why i cannot reproduce this (and most other users cannot either).

The other thing i found through the links which is interesting, is some people have encountered problems due to a «incorrect apk installation’, which can be resolved by a reinstall, which i have asked the users who have had the problem to try (which does not make a difference). Also it seems once the problem is encountered (which is on first use) it will be persistent.

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How do I resolve ClassNotFoundException?

I am trying to run a Java application, but getting this error:

After the colon comes the location of the class that is missing. However, I know that that location does not exist since the class is located elsewhere. How can I update the path of that class? Does it have something to do with the class path?

27 Answers 27

A classpath is a list of locations to load classes from.

These ‘locations’ can either be directories, or jar files.

For directories, the JVM will follow an expected pattern for loading a class. If I have the directory C:/myproject/classes in my classpath, and I attempt to load a class com.mycompany.Foo, it will look under the classes directory for a directory called com, then under that a directory called mycompany, and finally it will look for a file called Foo.class in that directory.

In the second instance, for jar files, it will search the jar file for that class. A jar file is in reality just a zipped collection of directories like the above. If you unzip a jar file, you’ll get a bunch of directories and class files following the pattern above.

So the JVM traverses a classpath from start to finish looking for the definition of the class when it attempts to load the class definition. For example, in the classpath :

The JVM will attempt to look in the directory classes first, then in stuff.jar and finally in otherstuff.jar.

When you get a ClassNotFoundException, it means the JVM has traversed the entire classpath and not found the class you’ve attempted to reference. The solution, as so often in the Java world, is to check your classpath.

You define a classpath on the command line by saying java -cp and then your classpath. In an IDE such as Eclipse, you’ll have a menu option to specify your classpath.

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Android Studio: ClassNotFoundException

i was busy with my app for over a week, when suddenly:

here is my AndroidManifest.xml:

this was happening after some problems with my R.java (the id’s for the views where incorrect), after rebuilding the project this problem happend

i’ve already tried the Invalidate Cashes/restart in the IDE File-menu

Update 14:51: this is my compiler.xml file:

My MainActivity.java file (\src\main\java\nl\test\myapp\MainActivity.java) :

18 Answers 18

Close android studio. Navigate to the project folder. Delete all files relating to intelliJ (Android Studio) i.e

Also make sure that package name matches the package in the android manifest.xml.

Then reimport the project.

This happened to me because I renamed the root package and IntelliJ (android studio) didn’t track this.

I created a new project in Android studio and copied everything from the old project into the new one. Now it’s working again, without any(!) modifications to the code.

I had the same problem, turns out I screwed up with some final method. Be sure to check dalvikvm errors in logcat output before the FATAL EXCEPTION. I will give you some hints on the problem. In my case, I had a final method ( isResumed ) which was already defined in the base class — causing runtime crash. Wasn’t complaining at compile time.

I ran into this. My app had been running fine and one day it just started running into these ClassNotFoundExceptions. My code hadn’t changed at all.

As far as I can tell, it ended up being a bug in the build of Android Studio. I had recently updated to the latest release on the canary channel.

Switching back to an older release on the dev channel got things working again:

1. Go into Settings / Appearance & Behavior / System Settings / Update
2. Change to Dev Channel and Check Now.

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android ClassNotFoundException: Didn’t find class

I started to get this error after i delete the extra folder in app folder with same app files (and change app name, fixed names in all files). How can i fix this?

Here is manifest.xml

3 Answers 3

You do have a package mismatch error, it needs to be:

Since reader is the next subpackage and this is the subpackage that contains the Activities.

And don’t forget, you can specify the fully qualified name for each Activity, to prevent confusion:

I have the same problem today，because my library include the android-support-v4.jar not matching with my demo. I deleted the library’s android-support-v4.jar and copied my demo’s jar putting it in my library and it started to work.

In my case my antivirus software (Avira for Mac) grabs dex files after every build I make and puts them into quarantine. After I stopped Avira, my project builds and runs.

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