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java.util.ConcurrentModificationException at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(Unknown Source) at java.util.LinkedHashMap$EntryIterator.next(Unknown Source) at java.util.LinkedHashMap$EntryIterator.next(Unknown Source) at com.google.common.collect.AbstractMultimap$KeySet$1.next(AbstractMultimap.java:861) at com.google.common.collect.Iterators$5.next(Iterators.java:527) at com.google.common.collect.Iterators$3.next(Iterators.java:117) at br.com.caelum.vraptor.interceptor.Graph.addDummies(Graph.java:83) at br.com.caelum.vraptor.interceptor.Graph.orderTopologically(Graph.java:67) at br.com.caelum.vraptor.interceptor.Graph.topologicalOrder(Graph.java:61) at br.com.caelum.vraptor.interceptor.TopologicalSortedInterceptorRegistry.all(TopologicalSortedInterceptorRegistry.java:37) at br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:20) at br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:92) at br.com.caelum.vraptor.ioc.guice.GuiceProvider.provideForRequest(GuiceProvider.java:76) at br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:89)