I've used JabRef-3.8.2 (and earlier versions) for years on the 32-bit
desktop. On the new 64-bit desktop it will load once and not again. Logging
out and back in makes no difference. The problem appears to be a java issue.
The JabRef folks haven't been able to help as they've moved on to jdk
versions > 8 and the JabRef-4.x and -5.x don't work on linux because of
something Oracle did.

The host has a Ryzen7 2700 CPU on an ASUS Pro-X470 motherboard with the most
current BIOS firmware installed.

The OS is Slackware-64/x86_64, fully patched.

I installed JabRef-2.9.2 from the slackbuilds.org repo and it loaded but
would not display keyword groups or allow me to re-load those. I then ran
the build script against JabRef-3.8.2 and it loaded both the reference
database and the keyword groups. I deleted a group (an inadvertent "."),
saved the file, and shut down the application. When I tried to restart it it
failed with this list of error messages:

$ /usr/bin/JabRef Error parsing gtk-icon-sizes string: ''
09:55:43.989 [AWT-EventQueue-0] INFO  net.sf.jabref.logic.importer.OpenDatabase 
- Opening: /home/rshepard/documents/jabrefdb.bib
09:55:44.307 [AWT-EventQueue-0] ERROR net.sf.jabref.FallbackExceptionHandler - 
Uncaught exception Occurred in Thread[AWT-EventQueue-0,6,main]
java.lang.NumberFormatException: For input string: "keywords"
        at 
java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) 
~[?:1.8.0_221]
        at java.lang.Integer.parseInt(Integer.java:580) ~[?:1.8.0_221]
        at java.lang.Integer.parseInt(Integer.java:615) ~[?:1.8.0_221]
        at 
net.sf.jabref.logic.importer.util.GroupsParser.keywordGroupFromString(GroupsParser.java:104)
 ~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.util.GroupsParser.fromString(GroupsParser.java:76) 
~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.util.GroupsParser.importGroups(GroupsParser.java:42)
 ~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.util.MetaDataParser.parse(MetaDataParser.java:63) 
~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.util.MetaDataParser.parse(MetaDataParser.java:33) 
~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.fileformat.BibtexParser.parseFileContent(BibtexParser.java:218)
 ~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.fileformat.BibtexParser.parse(BibtexParser.java:150)
 ~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.fileformat.BibtexImporter.importDatabase(BibtexImporter.java:70)
 ~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.Importer.importDatabase(Importer.java:65) 
~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.fileformat.BibtexImporter.importDatabase(BibtexImporter.java:62)
 ~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.OpenDatabase.loadDatabase(OpenDatabase.java:64) 
~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.logic.importer.OpenDatabase.loadDatabase(OpenDatabase.java:43) 
~[JabRef-3.8.2.jar:?]
        at net.sf.jabref.JabRefGUI.openLastEditedDatabases(JabRefGUI.java:210) 
~[JabRef-3.8.2.jar:?]
        at net.sf.jabref.JabRefGUI.openWindow(JabRefGUI.java:94) 
~[JabRef-3.8.2.jar:?]
        at net.sf.jabref.JabRefGUI.<init>(JabRefGUI.java:63) 
~[JabRef-3.8.2.jar:?]
        at net.sf.jabref.JabRefMain.lambda$start$1(JabRefMain.java:128) 
~[JabRef-3.8.2.jar:?]
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) 
~[?:1.8.0_221]
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) 
~[?:1.8.0_221]
        at java.awt.EventQueue.access$500(EventQueue.java:97) ~[?:1.8.0_221]
        at java.awt.EventQueue$3.run(EventQueue.java:709) ~[?:1.8.0_221]
        at java.awt.EventQueue$3.run(EventQueue.java:703) ~[?:1.8.0_221]
        at java.security.AccessController.doPrivileged(Native Method) 
~[?:1.8.0_221]
        at 
java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
 ~[?:1.8.0_221]
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) ~[?:1.8.0_221]
        at 
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
 [?:1.8.0_221]
        at 
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) 
[?:1.8.0_221]
        at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
 [?:1.8.0_221]
        at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) 
[?:1.8.0_221]
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) 
[?:1.8.0_221]
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) 
[?:1.8.0_221]

Removing, rebuilding, and reinstalling JabRef-3.8.2 still fails with the
same error report.

Why JabRef will run once but not again makes no sense to me. I need to use
this application and ask for any and all help, advice, suggestions, or
solutions you can provide.

Long ago we had a local professional java developer but he moved to the east
coast and has not participated on this mail list since.

TIA,

Rich
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