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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 edu.isi.karma.modeling.alignment.AlignmentManager.removeWorkspaceAlignments(AlignmentManager.java:28) at edu.isi.karma.controller.command.CloseWorkspaceCommand.doIt(CloseWorkspaceCommand.java:46) at edu.isi.karma.controller.history.CommandHistory.doCommand(CommandHistory.java:114) at edu.isi.karma.webserver.ExecutionController.invokeCommand(ExecutionController.java:184) at edu.isi.karma.webserver.RequestController.doPost(RequestController.java:56)