@MrAureliusR: Looks like they reverted the version upstream and released a new snapshot. Let me know if it works for you; launched with an empty screen for me (openjdk 21)
It seems the violetumleditor-3.0.0.deb file is not available on Sourceforge anymore -- it's showing the latest version as 2.2 from what I can tell. Thus the package is failing to build.
@twa nevermind installing jdk for java 8 fixed it. Strange that it was working before. Maybe an update uninstalled some java packages due to conflicts
@TheHighGroundWin: what version of Java are you using when you get that error?
It says illegal reflective access operation has occured:
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.thoughtworks.xstream.converters.collections.TreeMapConverter (file:/usr/share/violetumleditor/violetumleditor.jar) to
field java.util.TreeMap.comparator
WARNING: Please consider reporting this to the maintainers of com.thoughtworks.xstream.converters.collections.TreeMapConverter
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Exception in thread "main" java.lang.NullPointerException
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It looks like the upstream source file was updated but the checksum in the PKGBUILD wasn't. The build currently fails validation: violetumleditor-2.2.2_20250531.deb ... FAILED. Could you please update the sha256sums? Thanks!