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Bug 175591 - CompletionSettings inconsistent
CompletionSettings inconsistent
Product: editor
Classification: Unclassified
Component: Completion & Templates
All All
: P3 (vote)
: 6.x
Assigned To: Dusan Balek
Depends on:
  Show dependency treegraph
Reported: 2009-10-28 13:53 UTC by emi
Modified: 2009-11-27 04:41 UTC (History)
1 user (show)

See Also:
Issue Type: DEFECT

Simple patch to use a hard reference. (1.42 KB, patch)
2009-10-28 13:54 UTC, emi
Details | Diff

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Description emi 2009-10-28 13:53:10 UTC
I have been experiencing activation of the autopopup although it was set to "false". Took me a while to track the issue
to the CompletionSettings class.

The problem is that CompletionSettings implements some form of "soft"-singleton. It keeps a SoftReference on the
instance and if that's null, it recreates the instance.

The steps to reproduce the problem are:

1. Disable autopopup for a mimetype.

2. Edit some file of the previous mimetype. At this point CompletionSettings is updated with the proper autopopup values
(via notifyEditorComponentChange).

3. Trigger some OutOfMemory situation. The VM will try to free as much memory as possible now. The SoftReference from
CompletionSettings will be freed !

4. Type some autopopup trigger like the dot(.). This will ask for the CompletionSettings completionAutoPopup. At this
point the soft reference is null, it will recreate a new instance of CompletionSettings. The completionAutoPopup method
calls initialize() which reads the settings from MimePath.EMPTY with some "true" defaults.

5. Note how completionAutoPopup becomes true now and the completion popup is displayed.

See the attached patch for a fix, it just uses a normal hard reference instead.
Comment 1 emi 2009-10-28 13:54:05 UTC
Created attachment 90175 [details]
Simple patch to use a hard reference.
Comment 2 Jiri Kovalsky 2009-10-28 13:57:37 UTC
Thanks Emilian. I have added this issue to the list [1] of NetFIXed issues. Dusane, would you please be so kind and
review + integrate the patch if you don't have any objections? Thanks!

Comment 3 Dusan Balek 2009-10-29 14:24:13 UTC
CompletionSettings should represent a simple wrapper around the Preferences instance storing the code completion
settings valid for ALL languages/mime-types (BTW: How do you disable code completion autopopup for a mime-type?). The
Preferences instance constructed for the MimePath.EMPTY should be the only one used; there is no reason for using
Preferences instances created for particular mime-types). In such a case, CompletionSettings recreation should not break

Thanks for pointing this problem out.

Fixed in jet-main.
Comment 4 emi 2009-10-29 14:48:50 UTC
Changing completion for a single mimetype is simple: just use the MimeLookup. It's also a very nice way to configure the
IDE, not all people want the same settings for all file types...

I don't agree with your patch though. You had a perfectly fine mechanism to tweak some completion settings per mimetype,
which had a bug. Removing the feature altogether does fix the bug, but it also removes the flexibility for no good reason.

What kept you from just adding my patch ?
Comment 5 Dusan Balek 2009-10-29 16:17:37 UTC
OK - fixed in jet-main without removing the flexibility.
Comment 6 emi 2009-10-29 16:53:00 UTC
It looks better now. I see that your main concern is that you didn't want the singleton to be updated once the editor
changes (via EditorRegistry).

The new class looks better although you might as well have created static methods since getInstance is no longer
providing a singleton but behaves as a factory -- creating new instances for each call.

Glad that the per-mimetype feature is still there :-)
Comment 7 Quality Engineering 2009-10-30 11:04:55 UTC
Integrated into 'main-golden', will be available in build *200910300201* on (upload may still be in progress)
User: Dusan Balek <>
Log: Issue #175591: CompletionSettings inconsistent - fixed.
Comment 8 Quality Engineering 2009-10-30 22:42:33 UTC
Integrated into 'main-golden', will be available in build *200910301401* on (upload may still be in progress)
User: Dusan Balek <>
Log: Issue #175591: CompletionSettings inconsistent - fix cont.
Comment 9 Jiri Kovalsky 2009-11-27 04:41:09 UTC
Thanks Dusane for integrating the patch and more importantly thanks very much Emilian for providing the patch!

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