Re: [ jEdit-devel ] Error on switching Sessions

[Doug B. <do...@cl...>]

Ok - I found that when I disabled BufferTabs (but left it installed), 
this problem went away.

Doug

Doug Breaux wrote:
> I've just noticed this on pre11, but it's possible it was happening in 
> an earlier release too.
> 
> With the Sessions plugin, when I switch to certain Sessions, I get this 
> Exception logged (and I see some symptoms of session-switching and 
> buffer-loading not quite completing):
> 
> [error] AWT-EventQueue-0: java.lang.NullPointerException
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.Buffer.markTokens(Buffer.java:2116)
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.textarea.ChunkCache.lineToChunkList(ChunkCache.java:752)
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.textarea.ChunkCache.updateChunksUpTo(ChunkCache.java:627)
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.textarea.ChunkCache.getLineInfo(ChunkCache.java:248)
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.textarea.JEditTextArea.recalculateLastPhysicalLine(JEditTextArea.java:6000) 
> 
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.textarea.DisplayManager.init(DisplayManager.java:572)
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.textarea.JEditTextArea.setBuffer(JEditTextArea.java:302)
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.EditPane.setBuffer(EditPane.java:105)
> [error] AWT-EventQueue-0:  at 
> org.gjt.sp.jedit.View.setBuffer(View.java:961)
> [error] AWT-EventQueue-0:  at sessions.Session.open(Session.java:270)
> [error] AWT-EventQueue-0:  at sessions.Session.open(Session.java:221)
> [error] AWT-EventQueue-0:  at 
> sessions.SessionManager.setCurrentSession(SessionManager.java:147)
> [error] AWT-EventQueue-0:  at 
> sessions.SessionSwitcher.itemStateChanged(SessionSwitcher.java:178)
> [error] AWT-EventQueue-0:  at 
> javax.swing.JComboBox.fireItemStateChanged(JComboBox.java:1162)
> [error] AWT-EventQueue-0:  at 
> javax.swing.JComboBox.selectedItemChanged(JComboBox.java:1219)
> [error] AWT-EventQueue-0:  at 
> javax.swing.JComboBox.contentsChanged(JComboBox.java:1266)
> [error] AWT-EventQueue-0:  at 
> javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:100) 
> 
> [error] AWT-EventQueue-0:  at 
> javax.swing.DefaultComboBoxModel.setSelectedItem(DefaultComboBoxModel.java:88) 
> 
> [error] AWT-EventQueue-0:  at 
> javax.swing.JComboBox.setSelectedItem(JComboBox.java:551)
> [error] AWT-EventQueue-0:  at 
> javax.swing.JComboBox.setSelectedIndex(JComboBox.java:597)
> [error] AWT-EventQueue-0:  at 
> javax.swing.plaf.basic.BasicComboPopup$ListMouseHandler.mouseReleased(BasicComboPopup.java:749) 
> 
> [error] AWT-EventQueue-0:  at 
> java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:232)
> [error] AWT-EventQueue-0:  at 
> java.awt.Component.processMouseEvent(Component.java:5100)
> [error] AWT-EventQueue-0:  at 
> javax.swing.plaf.basic.BasicComboPopup$2.processMouseEvent(BasicComboPopup.java:452) 
> 
> [error] AWT-EventQueue-0:  at 
> java.awt.Component.processEvent(Component.java:4897)
> [error] AWT-EventQueue-0:  at 
> java.awt.Container.processEvent(Container.java:1569)
> [error] AWT-EventQueue-0:  at 
> java.awt.Component.dispatchEventImpl(Component.java:3615)
> [error] AWT-EventQueue-0:  at 
> java.awt.Container.dispatchEventImpl(Container.java:1627)
> [error] AWT-EventQueue-0:  at 
> java.awt.Component.dispatchEvent(Component.java:3477)
> [error] AWT-EventQueue-0:  at 
> java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
> [error] AWT-EventQueue-0:  at 
> java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
> [error] AWT-EventQueue-0:  at 
> java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
> [error] AWT-EventQueue-0:  at 
> java.awt.Container.dispatchEventImpl(Container.java:1613)
> [error] AWT-EventQueue-0:  at 
> java.awt.Window.dispatchEventImpl(Window.java:1606)
> [error] AWT-EventQueue-0:  at 
> java.awt.Component.dispatchEvent(Component.java:3477)
> [error] AWT-EventQueue-0:  at 
> java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
> [error] AWT-EventQueue-0:  at 
> java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201) 
> 
> [error] AWT-EventQueue-0:  at 
> java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151) 
> 
> [error] AWT-EventQueue-0:  at 
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
> [error] AWT-EventQueue-0:  at 
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
> [error] AWT-EventQueue-0:  at 
> java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
> 
> This does not happen with all Sessions, but I can tell no obvious 
> differences between the Sessions for which it happens and those for 
> which it does not.
> 
> Can anyone tell from the stack trace what is a likely cause?  Sessions 
> is doing no more than view.setBuffer(buffer), so something about the 
> current Buffer seems to be upsetting jEdit.  The line in Buffer.java 
> actually throwing the Exception is:
> 
>     context = tokenMarker.markTokens(prevContext,
>         (i == lineIndex ? tokenHandler
>         : DummyTokenHandler.INSTANCE),seg);
> 
> which means that tokenMarker is null.  What does that mean, and why 
> would it be that way for certain Buffers?
> 
> I'm willing to work on Sessions if the problem is there, or to manually 
> clean up a property somewhere if necessary.  I just need some help 
> finding the root cause.  Thanks.