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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:750) at java.util.HashMap$KeyIterator.next(HashMap.java:786) at org.apache.catalina.util.Enumerator.nextElement(Enumerator.java:166) at servletunit.struts.CactusStrutsTestCase.getActionServlet(CactusStrutsTestCase.java:283) at servletunit.struts.CactusStrutsTestCase.actionPerform(CactusStrutsTestCase.java:347) at com.mgon.ete.web.struts.unit.StartSessionActionTest.testEmptyParameters(Unknown Source)