JabRef 4.2 is not working under Opensuse Tumbleweed

Hi,
I am unable to make JabRef 4.2 work on my Linux distribution. No windows appear and it is frozen in the background. I am using Oracle java 1.8.0_172, and when I launch JabRef from a console, I get the following messages:
$Gtk-Message: 09:59:36.016: (for origin information, set GTK_DEBUG): failed to retrieve property gtk-primary-button-warps-slider' of typegboolean’ from rc file value “((GString*) 0x7f8d8440eb60)” of type `gboolean’
09:59:40.087 [AWT-EventQueue-0] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[AWT-EventQueue-0,6,main]
java.lang.ClassCastException: java.awt.Font cannot be cast to javax.swing.plaf.FontUIResource
at org.jabref.JabRefGUI.setLookAndFeel(JabRefGUI.java:288) ~[JabRef-4.2.jar:?]
at org.jabref.JabRefGUI.openWindow(JabRefGUI.java:87) ~[JabRef-4.2.jar:?]
at org.jabref.JabRefGUI.(JabRefGUI.java:60) ~[JabRef-4.2.jar:?]
at org.jabref.JabRefMain.lambda$start$0(JabRefMain.java:182) ~[JabRef-4.2.jar:?]
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) ~[?:1.8.0_172]
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) ~[?:1.8.0_172]
at java.awt.EventQueue.access$500(EventQueue.java:97) ~[?:1.8.0_172]
at java.awt.EventQueue$3.run(EventQueue.java:709) ~[?:1.8.0_172]
at java.awt.EventQueue$3.run(EventQueue.java:703) ~[?:1.8.0_172]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_172]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74) ~[?:1.8.0_172]
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) ~[?:1.8.0_172]
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205) [?:1.8.0_172]
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) [?:1.8.0_172]
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) [?:1.8.0_172]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [?:1.8.0_172]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) [?:1.8.0_172]
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) [?:1.8.0_172]

Any help or suggestion will be greatly appreciated
Romuald
PS. JabRef 4.1 is working fine with the same system

Hi,

this error happend when you used the option override font settings.
This is fixed in the latest master version http://builds.jabref.org/master/

Hi
indeed!
Everything is fine now. Thank you for your answer and for the development of this very important tool, helpful in my day to day activity
Regards
Romuald

Thanks for your kind words!

We appreciate this a lot. And you can also contribute to the development of JabRef in many ways:
https://help.jabref.org/en/FAQcontributing

Regards
Christoph