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 yay -S timeslottracker
:: Checking for conflicts...
:: Checking for inner conflicts...
[Aur:1]  timeslottracker-1.3.1-1

  1 timeslottracker                          (Build Files Exist)
==> Packages to cleanBuild?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> N
:: PKGBUILD up to date, Skipping (1/1): timeslottracker
  1 timeslottracker                          (Build Files Exist)
==> Diffs to show?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> N
:: (1/1) Parsing SRCINFO: timeslottracker
==> Erstelle Paket: timeslottracker 1.3.1-1 (Mi 18 Nov 2020 00:49:44 CET)
==> Empfange Quellen...
  -> Lade timeslottracker_1.3.1_all.deb herunter...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404 Not Found
==> FEHLER: Fehler beim Download von http://downloads.sourceforge.net/project/timeslottracker/TimeSlotTracker/1.3.1/timeslottracker_1.3.1_all.deb
    Breche ab...
error downloading sources: timeslottracker

https://sourceforge.net/projects/timeslottracker/files/latest/download

timeslottracker_1.3.21_all.deb

Most likely file no longer available or filename changed

Apparently it's necessary to give your user permission to write to /var/log/timeslottracker/ . Please report the bug upstream.

Crashes for me on startup.

[fabian@arch ~]$ tst
Can't load log handler "java.util.logging.FileHandler"
java.nio.file.AccessDeniedException: /var/log/timeslottracker/timeslottracker.log.0.lck
java.nio.file.AccessDeniedException: /var/log/timeslottracker/timeslottracker.log.0.lck
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
        at sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:177)
        at java.nio.channels.FileChannel.open(FileChannel.java:287)
        at java.nio.channels.FileChannel.open(FileChannel.java:335)
        at java.util.logging.FileHandler.openFiles(FileHandler.java:478)
        at java.util.logging.FileHandler.<init>(FileHandler.java:281)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at java.lang.Class.newInstance(Class.java:442)
        at java.util.logging.LogManager$5.run(LogManager.java:966)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.util.logging.LogManager.loadLoggerHandlers(LogManager.java:958)
        at java.util.logging.LogManager.initializeGlobalHandlers(LogManager.java:1578)
        at java.util.logging.LogManager.access$1500(LogManager.java:145)
        at java.util.logging.LogManager$RootLogger.accessCheckedHandlers(LogManager.java:1667)
        at java.util.logging.Logger.getHandlers(Logger.java:1777)
        at java.util.logging.Logger.log(Logger.java:735)
        at java.util.logging.Logger.doLog(Logger.java:765)
        at java.util.logging.Logger.log(Logger.java:788)
        at java.util.logging.Logger.info(Logger.java:1490)
        at net.sf.timeslottracker.Starter.main(Starter.java:552)
currentVersion = [1.3.1]
lastVersion.getVersion() = [1.3.1]
Exception in thread "Thread-7" java.lang.NullPointerException
        at net.sf.timeslottracker.gui.layouts.classic.timeslots.Timeslots.getSortedColumn(Timeslots.java:445)
        at net.sf.timeslottracker.gui.layouts.classic.timeslots.Timeslots.saveColumnOrderAndSorting(Timeslots.java:567)
        at net.sf.timeslottracker.gui.layouts.classic.timeslots.Timeslots$SetConfigurationActionListener.actionPerformed(Timeslots.java:79)
        at net.sf.timeslottracker.Starter.fireAction(Starter.java:966)
        at net.sf.timeslottracker.core.Configuration.getConfigurationFromListeners(Configuration.java:347)
        at net.sf.timeslottracker.core.Configuration.save(Configuration.java:291)
        at net.sf.timeslottracker.Starter.saveApplicationData(Starter.java:625)
        at net.sf.timeslottracker.Starter.access$400(Starter.java:80)
        at net.sf.timeslottracker.Starter$7.run(Starter.java:357)

An idea?