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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)	at java.util.HashMap$KeyIterator.next(HashMap.java:828)	at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)	at org.sonatype.nexus.rest.AbstractNexusPlexusResource.createRepositoryContentReference(AbstractNexusPlexusResource.java:168)	at org.sonatype.nexus.rest.repositories.AbstractRepositoryPlexusResource.listRepositories(AbstractRepositoryPlexusResource.java:216)	at org.sonatype.nexus.rest.repositories.RepositoryListPlexusResource.get(RepositoryListPlexusResource.java:93)	at org.sonatype.plexus.rest.resource.RestletResource.represent(RestletResource.java:263)	at org.sonatype.nexus.rest.NexusRestletResource.represent(NexusRestletResource.java:34)	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)	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 com.noelios.restlet.ChainHelper.handle(ChainHelper.java:124)	at org.restlet.Component.handle(Component.java:673)	at org.restlet.Server.handle(Server.java:331)	at com.noelios.restlet.ServerHelper.handle(ServerHelper.java:68)	at com.noelios.restlet.http.HttpServerHelper.handle(HttpServerHelper.java:147)	at com.noelios.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:881)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at org.jsecurity.web.servlet.FilterChainWrapper.doFilter(FilterChainWrapper.java:52)	at org.jsecurity.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:105)	at org.jsecurity.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:135)	at org.jsecurity.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:180)	at org.jsecurity.web.servlet.FilterChainWrapper.doFilter(FilterChainWrapper.java:57)	at org.jsecurity.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:105)	at org.jsecurity.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:135)	at org.jsecurity.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:180)	at org.jsecurity.web.servlet.FilterChainWrapper.doFilter(FilterChainWrapper.java:57)	at org.jsecurity.web.servlet.JSecurityFilter.doFilterInternal(JSecurityFilter.java:382)	at org.jsecurity.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:180)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)