Will not start on Linux Debian 8

[eeinnor]

Hi,
First I had some problems with RTTXcomm, but I think I solved those issues. But, when launching avr4l I now get the following message:

Sep 28, 2019 4:59:47 PM java.util.prefs.FileSystemPreferences$6 run
WARNING: Prefs file removed in background /root/.java/.userPrefs/prefs.xml
Warning: Nashorn engine is planned to be removed from a future JDK release
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class javax.swing.text.AbstractDocument$DefaultDocumentEventUndoableWrapper cannot be cast to class javax.swing.text.AbstractDocument$DefaultDocumentEvent (javax.swing.text.AbstractDocument$DefaultDocumentEventUndoableWrapper and javax.swing.text.AbstractDocument$DefaultDocumentEvent are in module java.desktop of loader 'bootstrap')
at jsyntaxpane.CompoundUndoManager.undoableEditHappened(CompoundUndoManager.java:61)
at java.desktop/javax.swing.text.AbstractDocument.fireUndoableEditUpdate(AbstractDocument.java:293)
at java.desktop/javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:761)
at java.desktop/javax.swing.text.AbstractDocument.insertString(AbstractDocument.java:716)
at java.desktop/javax.swing.text.PlainDocument.insertString(PlainDocument.java:131)
at java.desktop/javax.swing.text.DefaultEditorKit.read(DefaultEditorKit.java:274)
at jsyntaxpane.DefaultSyntaxKit.read(DefaultSyntaxKit.java:223)
at java.desktop/javax.swing.JEditorPane.setText(JEditorPane.java:1428)
at mainPckg.Main_Frame.(Main_Frame.java:1445)
at mainPckg.Main_Frame$58.run(Main_Frame.java:3852)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Best Regards,
Einar