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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