Exception in thread "AsyncTask" on FileSortOrderByName

[UteHaus]

⚠️ Before posting ⚠️

• This is a bug, not a question or an enhancement.
• I've searched for similar issues and didn't find a duplicate.
• I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

Swap down on the folder view, to update the list.
Or switch from settings to list view.

Expected behaviour

The app not break.

Actual behaviour

The app crashes when updating the list of files.

Android version

30220390

Device brand and model

pixle 4

Stock or custom OS?

Custom (explain in "additional information")

Nextcloud android app version

3.22.3

Nextcloud server version

25.0.1

Using a reverse proxy?

No

Android logs

Cause of error

Exception in thread "AsyncTask #20" java.lang.RuntimeException: An error occurred while executing doInBackground()
    at android.os.AsyncTask$4.done(AsyncTask.java:415)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
    at java.util.concurrent.FutureTask.run(FutureTask.java:271)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at java.lang.Thread.run(Thread.java:920)
Caused by: Exception in thread "AsyncTask #20" java.util.ConcurrentModificationException
    at java.util.ArrayList.sort(ArrayList.java:1472)
    at java.util.Collections.sort(Collections.java:206)
    at kotlin.collections.CollectionsKt__MutableCollectionsJVMKt.sortWith(MutableCollectionsJVM.kt:42)
    at com.owncloud.android.utils.FileSortOrderByName.sortServerFiles(FileSortOrderByName.kt:58)
    at com.owncloud.android.utils.FileSortOrderByName.sortCloudFiles(FileSortOrderByName.kt:43)
    at com.owncloud.android.ui.adapter.OCFileListAdapter.setData(OCFileListAdapter.java:694)
    at com.owncloud.android.ui.fragment.OCFileListSearchAsyncTask.doInBackground(OCFileListSearchAsyncTask.kt:70)
    at com.owncloud.android.ui.fragment.OCFileListSearchAsyncTask.doInBackground(OCFileListSearchAsyncTask.kt:33)
    at android.os.AsyncTask$3.call(AsyncTask.java:394)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at java.lang.Thread.run(Thread.java:920)

App information

• ID: com.nextcloud.client
• Version: 30220390
• Build flavor: gplay

Device information

• Brand: google
• Device: sunfish
• Model: Pixel 4a
• Id: SQ3A.220705.004
• Product: sunfish

Firmware

• SDK: 32
• Release: 12
• Incremental: 8fda5a3502

Server error logs

No response

Additional information

No response

[debojyoti452]

@UteHaus
Is this task available?

[UteHaus]

This bug cam when I selected a folder in the favorites or go back to the favorites. (With this exception the App closed.)

The error came sporadically.

Nexctloud App version: 3.23.1

[Garfonso]

I get the same behavior. It seems to load the favorites just fine and the suddenly crashes.

This is the log the app shows me:

Cause of error

Exception in thread "AsyncTask #11" java.lang.RuntimeException: An error occurred while executing doInBackground()
    at android.os.AsyncTask$4.done(AsyncTask.java:415)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:381)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:250)
    at java.util.concurrent.FutureTask.run(FutureTask.java:269)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
    at java.lang.Thread.run(Thread.java:1012)
Caused by: Exception in thread "AsyncTask #11" java.util.ConcurrentModificationException
    at java.util.ArrayList.sort(ArrayList.java:1472)
    at java.util.Collections.sort(Collections.java:206)
    at kotlin.collections.CollectionsKt__MutableCollectionsJVMKt.sortWith(MutableCollectionsJVM.kt:42)
    at com.owncloud.android.utils.FileSortOrderByName.sortServerFiles(FileSortOrderByName.kt:58)
    at com.owncloud.android.utils.FileSortOrderByName.sortCloudFiles(FileSortOrderByName.kt:43)
    at com.owncloud.android.ui.adapter.OCFileListAdapter.setData(OCFileListAdapter.java:700)
    at com.owncloud.android.ui.fragment.OCFileListSearchAsyncTask.doInBackground(OCFileListSearchAsyncTask.kt:70)
    at com.owncloud.android.ui.fragment.OCFileListSearchAsyncTask.doInBackground(OCFileListSearchAsyncTask.kt:33)
    at android.os.AsyncTask$3.call(AsyncTask.java:394)
    at java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
    at java.lang.Thread.run(Thread.java:1012)

App information

• ID: com.nextcloud.client
• Version: 30240190
• Build flavor: gplay

Device information

• Brand: samsung
• Device: dm3q
• Model: SM-S918B
• Id: TP1A.220624.014
• Product: dm3qxeea

Firmware

• SDK: 33
• Release: 13
• Incremental: S918BXXS1AWBM

[joshtrichards]

This appears to match most of the traces in #7782, but reliable reproduction steps are hard to come by. Let's consolidate this matter there.