pentaho/pentaho-kettle — pull request #199 by prakapenka (2014-01-15 10:16:35+00:00)
Title: PDI-5229 - ConcurrentModificationException when restarting transformation

Fixed ConcurrentModificationException for transformation listeners collections as per bug description.
See http://jira.pentaho.com/browse/PDI-5229
Check junit tests to verify fix.