[Helma-user] java.util.ConcurrentModificationException on app.addRepository

[Hannes Wallnoefer]

2008/7/17 Axel Zuzek <axel.zuzek at knallgrau.at>:
> Hello list,
>
> we load our widgets on helma start with app.addRepository and sometimes we
> get the following error code:
>
> ...
> [2008/07/17 11:19:23] [INFO] START INFO load widgets [Application
> twoday_w1_s2]
> [2008/07/17 11:19:23] [INFO] ---- adding repository
> C:\helma-1.6.2\apps\twoday_w1_1_1\core\widgets\amazon\code
> [2008/07/17 11:19:23] [ERROR] null:
> java.util.ConcurrentModificationException
> java.util.ConcurrentModificationException
>         at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
>         at java.util.HashMap$ValueIterator.next(HashMap.java:821)
>         at
> helma.framework.core.TypeManager.checkRepositories(TypeManager.java:204)
>         at
> helma.framework.core.TypeManager.checkPrototypes(TypeManager.java:124)
>         at
> helma.scripting.rhino.RhinoCore.updatePrototypes(RhinoCore.java:330)
>         at
> helma.scripting.rhino.RhinoEngine.enterContext(RhinoEngine.java:174)
>         at
> helma.framework.core.RequestEvaluator.run(RequestEvaluator.java:172)
>         at java.lang.Thread.run(Thread.java:619)
> [2008/07/17 11:19:23] [INFO] ---- adding repository
> C:\helma-1.6.2\apps\twoday_w1_1_1\core\widgets\archive\code
> [2008/07/17 11:19:23] [INFO] ---- adding repository
> C:\helma-1.6.2\apps\twoday_w1_1_1\core\widgets\credits\code
> ...
> the error is reproduceable on some machines (windows, linux) under
> helma1.6.0 and helma 1.6.2, java1.6.0_01 and java1.6.0_06. it seems to be a
> racing condition?

Just to make sure: it happens each time or just sometimes?
and always when the application starts up, or at different points in time?

hannes

> any ideas?
> many thx
> axel
>
> (function used to add repositories:)
> function modWidgetsLoadWidgets() {
>    var widgetDirs = knallgrau.Base.getRepositorySubDirs("widgets");
>    for (var i in widgetDirs) {
>       var widgets = widgetDirs[i].list();
>       for (var j in widgets) {
>          var dir = new helma.File(widgetDirs[i], widgets[j]);
>          if (!dir.isDirectory() || dir.getName() == "CVS" || dir.getName()
> == ".svn") continue;
>          app.log("---- adding repository " + dir.getAbsolutePath() +
> helma.File.separator + "code");
>          app.addRepository(dir.getAbsolutePath() + helma.File.separator +
> "code");
>       }
>    }
> }
>
>
>
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