NullPointerException on editing bibtex file

[ExecutorElassus]

JabRef version 2.10 on gentoo Linux

Steps to reproduce: This recently started happening (last week or so), without updating jabref itself, so I suspect it's a problem with a linked dependency. Anyway, I can neither create new entries nor edit existing ones. If I do, the following occurs:

1. highlight an entry
2. click the "edit" button or Ctrl-E
3. the following pops up in the error log:

java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:434)
at java.util.Properties.load0(Properties.java:353)
at java.util.Properties.load(Properties.java:341)
at com.michaelbaranov.microba.calendar.DefaultCalendarResources.(DefaultCalendarResources.java:28)
at com.michaelbaranov.microba.calendar.CalendarPane.(CalendarPane.java:185)
at com.michaelbaranov.microba.calendar.DatePicker.(DatePicker.java:120)
at com.michaelbaranov.microba.calendar.DatePicker.(DatePicker.java:74)
at net.sf.jabref.gui.date.DatePickerButton.(DatePickerButton.java:36)
at net.sf.jabref.EntryEditor.getExtra(EntryEditor.java:426)
at net.sf.jabref.EntryEditorTab.setupPanel(EntryEditorTab.java:155)
at net.sf.jabref.EntryEditorTab.(EntryEditorTab.java:82)
at net.sf.jabref.EntryEditor.setupFieldPanels(EntryEditor.java:273)
at net.sf.jabref.EntryEditor.(EntryEditor.java:219)
at net.sf.jabref.BasePanel.getEntryEditor(BasePanel.java:2357)
at net.sf.jabref.gui.MainTableSelectionListener.editSignalled(MainTableSelectionListener.java:221)
at net.sf.jabref.gui.MainTableSelectionListener.editSignalled(MainTableSelectionListener.java:215)
at net.sf.jabref.BasePanel$2.action(BasePanel.java:366)
at net.sf.jabref.BasePanel.runCommand(BasePanel.java:1666)
at net.sf.jabref.JabRefFrame$GeneralAction.actionPerformed(JabRefFrame.java:1139)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
at java.awt.Component.processMouseEvent(Component.java:6516)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
at java.awt.Component.processEvent(Component.java:6281)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4872)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:747)
at java.awt.EventQueue.access$300(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:706)
at java.awt.EventQueue$3.run(EventQueue.java:704)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:720)
at java.awt.EventQueue$4.run(EventQueue.java:718)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:717)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

JDK version is 8u77, jre is 1.8.0.

Cheers,

[Siedlerchr]

Would you please test with the actual version 3.3?

[ExecutorElassus]

Hi There,

Gentoo doesn't seem to have a compiling version above 2.10, and the jabref-bin package is only 3.2. Sorry if this might be a bit outside of your focus, but do you know of a source for a "live" ebuild to build from the most recent source?

Cheers,

[ExecutorElassus]

Update:
downloaded the .jar file. Running 'java -jar JabRef-3.3.jar' from console results in the following:

Exception in thread "main" java.lang.UnsupportedClassVersionError: net/sf/jabref/JabRefMain : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

So, dang. Can't run 3.3, at all.

[Siedlerchr]

@ExecutorElassus You need to install java8 from Oracle
Edit// https://packages.gentoo.org/packages/dev-java/oracle-jre-bin

@koppor
Do you know about the gentoo/debian packages ?
https://gpo.zugaina.org/app-text/jabref
https://packages.debian.org/stable/tex/jabref

[matthiasgeiger]

Are you sure that you run the application with an Java 8 JRE?
What is the output of java -version?

[ExecutorElassus]

Ah, I was on iceadtea-7 (ie, "IcedTea JDK 7.2.6.5 [icedtea-7]") which returned:

$ java -version
java version "1.7.0_99"
OpenJDK Runtime Environment (IcedTea 2.6.5) (Gentoo icedtea-7.2.6.5-r1)
OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode)

I switched to the Oracle VM, which now reads:
$ java -version
java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)

And version 3.3 runs fine. Ok, so chalk this up to an out-of-date version of jabref. Whoops. Thanks for clearing it up.

[matthiasgeiger]

No problem and enjoy working with the new version ;-)

[mlep]

@matthiasgeiger According to a message on the mailing list (this morning), JabRef 3 also works with OpenJDK 8.

[matthiasgeiger]

Yes. With an OpenJDK 8 it should work, too. However, there is that trouble with the GTK look-and-feel (see #393)