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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry( at java.util.HashMap$ at org.apache.catalina.util.Enumerator.nextElement( at servletunit.struts.CactusStrutsTestCase.getActionServlet( at servletunit.struts.CactusStrutsTestCase.actionPerform( at com.mgon.ete.web.struts.unit.StartSessionActionTest.testEmptyParameters(Unknown Source)