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java.util.ConcurrentModificationException at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1031) at java.util.TreeMap$KeyIterator.next(TreeMap.java:1058) at org.archive.crawler.frontier.WorkQueueFrontier.appendQueueReports(WorkQueueFrontier.java:1235) at org.archive.crawler.frontier.WorkQueueFrontier.standardReportTo(WorkQueueFrontier.java:1203) at org.archive.crawler.frontier.WorkQueueFrontier.reportTo(WorkQueueFrontier.java:1051) at org.archive.crawler.admin.CrawlJob.writeFrontierReport(CrawlJob.java:912) at org.archive.crawler.jspc.admin.reports.frontier_jsp._jspService(UnknownSource) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:358) at org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:342) at org.archive.crawler.admin.ui.RootFilter.doFilter(RootFilter.java:67) at org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:334) at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:286) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567) at org.mortbay.http.HttpContext.handle(HttpContext.java:1807) at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:525) at org.mortbay.http.HttpContext.handle(HttpContext.java:1757) at org.mortbay.http.HttpServer.service(HttpServer.java:879) at org.mortbay.http.HttpConnection.service(HttpConnection.java:789) at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:960) at org.mortbay.http.HttpConnection.handle(HttpConnection.java:806) at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:218) at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:300) at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:511)