[ jEdit-devel ] [ jedit-Bugs-3442116 ] ArrayIndexOutOfBoundsException after Project Open

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Bugs item #3442116, was opened at 2011-11-25 10:57
Message generated for change (Settings changed) made by k_satoda
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Alan Ezust (ezust)
>Assigned to: Kazutoshi Satoda (k_satoda)
Summary: ArrayIndexOutOfBoundsException after Project Open

Initial Comment:
This happened after starting jEdit and opening a project.
Activity log attached.


java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 10
	at org.gjt.sp.jedit.buffer.JEditBuffer.getLineStartOffset(JEditBuffer.java:361)
	at org.gjt.sp.jedit.textarea.ChunkCache.lineToChunkList(ChunkCache.java:784)
	at org.gjt.sp.jedit.textarea.ChunkCache.getLineSubregionCount(ChunkCache.java:272)
	at org.gjt.sp.jedit.textarea.DisplayManager.updateScreenLineCount(DisplayManager.java:627)
	at org.gjt.sp.jedit.textarea.DisplayManager.getScreenLineCount(DisplayManager.java:230)
	at org.gjt.sp.jedit.textarea.DisplayManager.hideLineRange(DisplayManager.java:758)
	at org.gjt.sp.jedit.textarea.DisplayManager.expandFolds(DisplayManager.java:404)
	at org.gjt.sp.jedit.textarea.DisplayManager.expandFolds(DisplayManager.java:429)
	at org.gjt.sp.jedit.textarea.DisplayManager.bufferLoaded(DisplayManager.java:649)
	at org.gjt.sp.jedit.textarea.BufferHandler.bufferLoaded(BufferHandler.java:67)
	at org.gjt.sp.jedit.buffer.JEditBuffer.fireBufferLoaded(JEditBuffer.java:2609)
	at org.gjt.sp.jedit.Buffer.access$700(Buffer.java:91)
	at org.gjt.sp.jedit.Buffer$1.run(Buffer.java:289)
	at org.gjt.sp.util.WorkThreadPool.doAWTRequest(WorkThreadPool.java:396)
	at org.gjt.sp.util.WorkThreadPool.doAWTRequests(WorkThreadPool.java:381)
	at org.gjt.sp.util.WorkThreadPool.access$200(WorkThreadPool.java:39)
	at org.gjt.sp.util.WorkThreadPool$RunRequestsInAWTThread.run(WorkThreadPool.java:481)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
	at java.awt.EventQueue.access$000(EventQueue.java:84)
	at java.awt.EventQueue$1.run(EventQueue.java:602)
	at java.awt.EventQueue$1.run(EventQueue.java:600)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)


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Comment By: Kazutoshi Satoda (k_satoda)
Date: 2012-02-11 03:23

Message:
I encountered this exception. And analyzed it a bit.

In DisplayManager.updateScreenLineCount(), it uses textArea.chunkCache
to get subregion count for a line. But when the active buffer is
switched in textArea while loading a buffer,
DisplayManager.bufferLoaded() will be called after the switch, and the
chunkCache is already switched (by a call of setBuffer() in
TextArea#setBuffer() ) to the new buffer shown in the textArea. Here is
the problem.

It may be solved by defering expandFolds() until the DisplayManager
become active and textArea.chunkCache is available for the correct
buffer.

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Comment By: Alan Ezust (ezust)
Date: 2011-11-26 09:59

Message:

I think I have a way to reproduce it now:

For me, it happens every time I open a project with 3 .java files that need
to be restored from the previous time. 
I use as a testcase, jEdit trunk as my test project. 

Open 3 java files, change to another project, and change back to this one.
I get those exceptions every time. 
It's not just at startup.


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Comment By: Shlomy Reinstein (shlomy)
Date: 2011-11-26 00:16

Message:
A very similar exception happens after starting jEdit and jumping to the
end of the current buffer (Ctrl+End), when PV is active (with the option to
remember open project files).
It doesn't reproduce each time. I doubt this has anything to do with PV -
from some debugging it turns out that the chunk cache is somehow not in
sync with the line manager. PV just seems to make this bug in the core
visible.


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