Public bug reported:

Steps:

1. Run jabref 3.8.2+ds-12~18.04 from bionic-proposed
2. Select Options → Preferences
3. It fails to open

Error from terminal:

16:31:59.651 [AWT-EventQueue-0] ERROR net.sf.jabref.FallbackExceptionHandler - 
Uncaught exception Occurred in Thread[AWT-EventQueue-0,6,main]
java.lang.NoClassDefFoundError: 
com/sun/java/swing/plaf/windows/WindowsLookAndFeel
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
        at java.lang.ClassLoader.defineClass(ClassLoader.java:1016) ~[?:?]
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174) ~[?:?]
        at 
jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802) 
~[?:?]
        at 
jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700)
 ~[?:?]
        at 
jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623)
 ~[?:?]
        at 
jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) 
~[?:?]
        at 
jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
 ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[?:?]
        at java.lang.Class.forName0(Native Method) ~[?:?]
        at java.lang.Class.forName(Class.java:315) ~[?:?]
        at 
net.sf.jabref.gui.preftabs.AppearancePrefsTab$LookAndFeel.getAvailableLookAndFeels(AppearancePrefsTab.java:64)
 ~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.gui.preftabs.AppearancePrefsTab.<init>(AppearancePrefsTab.java:104)
 ~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.gui.preftabs.PreferencesDialog.<init>(PreferencesDialog.java:91) 
~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.gui.JabRefFrame.showPreferencesDialog(JabRefFrame.java:740) 
~[JabRef-3.8.2.jar:?]
        at 
net.sf.jabref.gui.JabRefFrame$ShowPrefsAction.actionPerformed(JabRefFrame.java:1788)
 ~[JabRef-3.8.2.jar:?]
        at 
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967) ~[?:?]
        at 
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308) 
~[?:?]
        at 
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405) 
~[?:?]
        at 
javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262) ~[?:?]
        at javax.swing.AbstractButton.doClick(AbstractButton.java:369) ~[?:?]
        at 
javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1020) ~[?:?]
        at 
javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1064)
 ~[?:?]
        at 
java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297) ~[?:?]
        at java.awt.Component.processMouseEvent(Component.java:6632) ~[?:?]
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3342) ~[?:?]
        at java.awt.Component.processEvent(Component.java:6397) ~[?:?]
        at java.awt.Container.processEvent(Container.java:2263) ~[?:?]
        at java.awt.Component.dispatchEventImpl(Component.java:5008) ~[?:?]
        at java.awt.Container.dispatchEventImpl(Container.java:2321) ~[?:?]
        at java.awt.Component.dispatchEvent(Component.java:4840) ~[?:?]
        at 
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) ~[?:?]
        at 
java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547) ~[?:?]
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) 
~[?:?]
        at java.awt.Container.dispatchEventImpl(Container.java:2307) ~[?:?]
        at java.awt.Window.dispatchEventImpl(Window.java:2772) ~[?:?]
        at java.awt.Component.dispatchEvent(Component.java:4840) ~[?:?]
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) ~[?:?]
        at java.awt.EventQueue$4.run(EventQueue.java:721) ~[?:?]
        at java.awt.EventQueue$4.run(EventQueue.java:715) ~[?:?]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
        at 
java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
 ~[?:?]
        at 
java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
 ~[?:?]
        at java.awt.EventQueue$5.run(EventQueue.java:745) ~[?:?]
        at java.awt.EventQueue$5.run(EventQueue.java:743) ~[?:?]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
        at 
java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
 ~[?:?]
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:742) ~[?:?]
        at 
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
 [?:?]
        at 
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) 
[?:?]
        at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
 [?:?]
        at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) [?:?]
        at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [?:?]
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) [?:?]
Caused by: java.lang.ClassNotFoundException: 
com.sun.java.swing.plaf.windows.WindowsLookAndFeel
        at 
jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583) 
~[?:?]
        at 
jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
 ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[?:?]
        ... 54 more

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: jabref 3.8.2+ds-12~18.04
ProcVersionSignature: Ubuntu 4.18.0-16.17~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-16-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 18 16:29:50 2019
InstallationDate: Installed on 2018-11-29 (108 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: jabref
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: jabref (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic package-from-proposed third-party-packages

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https://bugs.launchpad.net/bugs/1820650

Title:
  [regression] Preferences window fails to open in 3.8.2+ds-12~18.04

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