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java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010) at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010) at org.sonatype.security.usermanagement.xml.ConfiguredUsersUserManager.listUsers(ConfiguredUsersUserManager.java:76) at org.sonatype.security.usermanagement.xml.ConfiguredUsersUserManager.searchUsers(ConfiguredUsersUserManager.java:138) at org.sonatype.security.DefaultSecuritySystem.searchUsers(DefaultSecuritySystem.java:540) at org.sonatype.security.rest.users.PlexusUserListPlexusResource.get(PlexusUserListPlexusResource.java:106) at org.sonatype.plexus.rest.resource.RestletResource.represent(RestletResource.java:246) at org.sonatype.nexus.rest.NexusRestletResource.represent(NexusRestletResource.java:50) at org.restlet.resource.Resource.getRepresentation(Resource.java:302) at org.restlet.resource.Resource.handleGet(Resource.java:464) at org.restlet.Finder.handle(Finder.java:353) at org.restlet.Filter.doHandle(Filter.java:150) at org.restlet.Filter.handle(Filter.java:195) at org.restlet.Router.handle(Router.java:504) at org.restlet.Filter.doHandle(Filter.java:150) at org.restlet.Filter.handle(Filter.java:195) at org.restlet.Router.handle(Router.java:504) at org.restlet.Filter.doHandle(Filter.java:150) at org.restlet.Filter.handle(Filter.java:195) at org.restlet.Filter.doHandle(Filter.java:150) at org.sonatype.plexus.rest.RetargetableRestlet.doHandle(RetargetableRestlet.java:39) at org.restlet.Filter.handle(Filter.java:195) at org.restlet.Filter.doHandle(Filter.java:150) at org.restlet.Filter.handle(Filter.java:195) at org.restlet.Filter.doHandle(Filter.java:150) at org.restlet.Filter.handle(Filter.java:195) at org.restlet.Filter.doHandle(Filter.java:150) at com.noelios.restlet.StatusFilter.doHandle(StatusFilter.java:130) at org.restlet.Filter.handle(Filter.java:195) at org.restlet.Filter.doHandle(Filter.java:150) at org.restlet.Filter.handle(Filter.java:195) at com.noelios.restlet.ChainHelper.handle(ChainHelper.java:124) at com.noelios.restlet.application.ApplicationHelper.handle(ApplicationHelper.java:112) at org.restlet.Application.handle(Application.java:341) at org.restlet.ext.wadl.WadlApplication.handle(WadlApplication.java:705) at org.restlet.Filter.doHandle(Filter.java:150) at org.restlet.Filter.handle(Filter.java:195) at org.restlet.Router.handle(Router.java:504)