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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] Created: (CONFIGURATION-347) Iterating over the keys of a file-based configuration can cause a ConcurrentModificationException
Date Wed, 05 Nov 2008 21:07:44 GMT
Iterating over the keys of a file-based configuration can cause a ConcurrentModificationException
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                 Key: CONFIGURATION-347
                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-347
             Project: Commons Configuration
          Issue Type: Bug
          Components: File reloading
    Affects Versions: 1.5
            Reporter: Oliver Heger


Some implementations of FileConfiguration return an iterator in their {{getKeys()}} method
that is directly connected to the underlying data store. When now a reload is performed (which
can happen at any time) the data store is modified, and the iterator becomes invalid.

This behavior is very confusing because ConcurrentModificationExceptions are typically related
to multi-threading access. But even if the code performing the iteration is the only instance
that accesses the configuration, the exception can be thrown.

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