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This exception has no message.
java.util.ConcurrentModificationException at org.apache.commons.collections.map.AbstractLinkedMap$LinkIterator.nextEntry(AbstractLinkedMap.java:555) at org.apache.commons.collections.map.AbstractLinkedMap$KeySetIterator.next(AbstractLinkedMap.java:455) at org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCache.getGroupKeys(IndexedDiskCache.java:520) at org.apache.jcs.engine.control.CompositeCache.getGroupKeys(CompositeCache.java:657) at org.apache.jcs.access.GroupCacheAccess.getGroupKeys(GroupCacheAccess.java:183) at com.pearson.cache.JCSCacheManager.getKeys(JCSCacheManager.java:84) at com.ncs.es.reporting.v40.studentdatamgmt.CacheTestAction.getCachedNodes(CacheTestAction.java:81) at com.ncs.es.reporting.v40.studentdatamgmt.CacheTestAction.go(CacheTestAction.java:71) at com.ncs.es.shrserv.v40.common.struts.BaseAction.execute(BaseAction.java:31) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1006) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6718) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121) at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764) at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219) at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)