Error: Execution failed for task ':app:clean'. Unable to delete file

问题

I\'m trying to rebuild my Android Studio Gradle project (containing mostly Kotlin code), but it started to throw an UnableToDeleteFileException during the cleaning/rebuilding process:

Execution failed for task \':app:clean\'.
> Unable to delete file: C:\\Users\\User\\KotlinGameEngine\\app\\build\\intermediates\\exploded-aar\\com.android.support\\appcompat-v7\\23.0.1\\jars\\classes.jar

This started happening after I tried to change my project\'s package structure. Unfortunately, I did it by renaming and moving the source folders rather than refactoring through Android Studio, which was a bad idea.

I\'ve been searching for a solution to this problem all day, and these are the things I have tried to no avail:

• Doing a Gradle sync;
• Reinstalling Java JRE and Java SDK;
• Reinstalling the latest version of Android Studio (1.4);
• Rolling back to the previous AS version (1.3);
• Invalidating the AS cache and restarting;
• Deleting the gradle and .gradle directories in the project directory;
• Deleting the .gradle directory in my user directory;
• Running gradlew clean from the AS terminal;
• Manually copying the sources over to a new project (weird that it somehow persists across projects...)

Things that I\'ve tried with a little success, but only let me perform one more clean and rebuild before the error occurs again:

• Closing AS, manually deleting the build files, and opening it again;
• Killing the java.exe process while AS is running (this could technically be done every time, but it\'s tedious and slows down the build process)

So it seems that compile the Java process may put a lock on the build files for some reason, but it might also be something to do with Kotlin. I have a (more mature) Java Android project that I\'m working on, though I can\'t reproduce this error when cleaning it. It seems to only happen to my Kotlin project.

Update:

I\'ve found that the problem is being caused by the Kotlin Android plugin. The problem disappears when I remove apply plugin: \'kotlin-android\' from the module\'s build.gradle file and comes back when I reinsert it. Feel free to offer any insight into this.

Update 2:

The last update isn\'t the cause. I found that if a project contains a Kotlin file then rebuilding and cleaning fails. It continues to fail, even if all the Kotlin files are removed, until the background Java process is killed, meaning it has some kind of lock on the build files. I submitted a bug here with more details and steps to reproduce the bug: KT-9440

回答1:

If you are using Android Studio 2.0 Beta, this issue might appear (more likely if you are working on NTFS filesystem) and it seems like the "Instant Run" is the culprit. Search for "Instant Run" in settings and uncheck the box.

I have filed an issue on the bug tracker.

回答2:

I killed all the java TM processes in the task manager and it let me to rebuild

回答3:

Try File -> Invalidate Caches and Restart

This worked for me

回答4:

After I posted a bug report to the Kotlin bug tracker, I was notified of Issue 61300 on the AOSP tracker. That seems to be the cause. Since there's nothing I can do at the moment, I'll mark this question as answered, and I'll update the answer if the bug is fixed.

In the meantime, if you're running Windows, I believe I've found a workaround. You'll need to download LockHunter (at your own risk of course), then add the following to your module's gradle.build file, replacing the lockhunter variable with your path to LockHunter.exe:

task clean(type: Exec) {
    ext.lockhunter = '\"C:\\LockHunter.exe\"'
    def buildDir = file(new File("build"))
    commandLine 'cmd', "$lockhunter", '/delete', '/silent', buildDir
}

This causes LockHunter to forcefully and silently unlock and delete the build files when the app:clean task runs.

回答5:

Clean project from Terminal using this command gradlew clean.

回答6:

Deleting the directory intermediates is a quick fix for problem.

The directory will be rebuilt when the project is rebuilt.

回答7:

I was facing same issue on Android Studio 2.2 preview 1, solution by @AndresSuarez was correct but for some reasons I couldn't find JAVA TM process in my task manager. So I tried the following solution and it worked -

Open command prompt and type TASKKILL /F /IM java.exe. This will kill all JAVA TM processes automatically. Now re-compile the app again, it will work.

Additionally, you can create a .bat file, add the above code in it and run it every time you face the issue.

回答8:

I had this problem in Android Studio 2.3.

I simply restarted Android Studio and after that I could clean without complaints.

回答9:

I had the same problem and this worked for me:

1. close Android Studio.
2. delete intermediates directory (as long as Android Studio is opened, this directory can't be deleted)
3. open Android Studio again

回答10:

For me it helps when I Exit Android Studio, click one more time Clean Project (it appears the same error) and next click Make Project - after that of course Run 'app' button in Android Studio.

回答11:

Find programs who used app/build/outputs/apk folder, then just delete folder.

I think Android Studio have to delete old apk folder before rebuilding.

回答12:

Some times intermediates creates problem so delete it and Rebuild project

OR

simply run cmd command - > gradlew clean

in your project folder in work space (its work for me)

回答13:

For me, this happened because of an active debugging process. So, before cleaning or rebuilding, make sure to kill all active processes. To nail down the success, execute Invalidate Caches/Restart.

回答14:

I solved this one in my ubuntu like this.

1. Check for the processes running in your system(Ubuntu) like in task manager in windows.

   Ubuntu terminal command to list out all processes running ----> "gnome-system-monitor"

2. Terminate or end the JAVA and ANDROID processes in the list.

3. Again start the studio and import project.

Its works for me without any problems. Hope this helps...

I thought this is the problem with the process that are already created and Duplicated.

回答15:

The solution is quite easy.

This is one of the solution which worked for me.

It might be possible that your project's app/build/outputs/apk folder is opened.

so just close this folder and rebuild your project. and it will be solved.

回答16:

As suggested in the bug report, uncommenting the line

idea.jars.nocopy=false

in the idea.properties file has solved the issue for me.

Note that this needs to be done every time Android Studio updates.

回答17:

For me, the culprit is adb holding onto the apk file since I utilise it to install and start the application on my physical device through command line.

So simply:

Task Manager > End process adb.exe

And then the file is free to be deleted and the project may be cleaned

回答18:

I solved with command:

taskkill /F /IM java.exe

and then:

gradle assembleDebug 

回答19:

If you are testing with a local backend (java servlet on local google app engine) the running process blocks some files. So you are not able to live deploy. So in this case you can solve this by stopping the local backend before starting clean or build. You find the option under "Run -> Stop backend".

回答20:

I had the same error, tried multiple ways but the solution worked for me was to delete build folders from /android and /android/app directories.

run react-native run-android worked for me.

回答21:

In Android Studio 3.0, I had the same issue. This fixed it:

1. Close Studio
2. Delete projectRoot/build/ and projectRoot/app/build/
3. Restart Studio

回答22:

I had the same issue after moving my project from D: to G: drive but disk checking solved my issue

I used chkdsk /f /r /x G: ** here some command line switches were used:**

/F Fixes errors on the disk

/R Locates bad sectors and recovers readable information (implies /F)

/X Forces the volume to dismount first if necessary (implies /F) (important)

Note: /X is important because it will dismount the drive and you can manually delete the build directory of your project,

now rebuild the project

回答23:

I just solved this exact problem for myself.

The problem was that somebody else had created the file so even though I have admin rights on the computer I was unable to make changes to the file or files. You need to go into the properties of the file or folder and change the ownership or add ownership. This web page explains it well step by step what you need to do.

Once I did the above, I found the file in file explorer and manually extracted it. I don't think it's needed in the android studio project if it was trying to delete it anyway.

回答24:

react native devs

run

sudo cd android && ./gradlew clean

and if you want release apk

sudo cd android && ./gradlew assembleRelease

Hope it will help someone

回答25:

This issue appeared to me in android studio 2.0 stable channel and the solution was due to a problem happened while updating my android studio i solved this by installing a fresh android studio. after deleting all old files for the old installation. and to keep the very nice feature of Instant Run

回答26:

if you're still having issues then update to the latest version of Android Studio(its 2.1 as of now), might be it was a bug with older version of Android Studio. Its resolved for me now.

回答27:

Cleaning the project in Android studio and running again fixed the issue. May be do "Make Project" as well.

回答28:

I had the same problem and I solved it by moving project folder into ext4 partition

回答29:

I solved it by global searching the missing directory in the project. then delete any files containing that keyword. it can clean successfully after I remove all the build and .externalNativeBuild directories manually.

回答30:

I am using Android Studio 3.0 Beta 7. Clean Project, Invalidate caches, restart studio did not work but Updating Kotlin version to 1.1.51 and restart studio solved this issue for me.

来源：https://stackoverflow.com/questions/32914499/error-execution-failed-for-task-appclean-unable-to-delete-file