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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 com.thoughtworks.xstream.converters.collections.CollectionConverter.marshal(CollectionConverter.java:54)	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:157)	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:148)	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.visit(AbstractReflectionConverter.java:118)	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:129)	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:100)	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:58)	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)	at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:98)	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:38)	at com.thoughtworks.xstream.XStream.marshal(XStream.java:837)	at com.thoughtworks.xstream.XStream.marshal(XStream.java:826)	at com.thoughtworks.xstream.XStream.toXML(XStream.java:801)	at com.thoughtworks.xstream.XStream.toXML(XStream.java:789)	at org.sonatype.nexus.configuration.model.DefaultConfigurationHelper.clone(DefaultConfigurationHelper.java:50)	at org.sonatype.nexus.configuration.source.FileConfigurationSource.saveConfiguration(FileConfigurationSource.java:319)	at org.sonatype.nexus.configuration.source.FileConfigurationSource.storeConfiguration(FileConfigurationSource.java:207)	at org.sonatype.nexus.configuration.application.DefaultNexusConfiguration.saveConfiguration(DefaultNexusConfiguration.java:284)	at org.sonatype.nexus.configuration.application.DefaultNexusConfiguration.applyAndSaveConfiguration(DefaultNexusConfiguration.java:296)	at org.sonatype.nexus.configuration.application.DefaultNexusConfiguration.deleteRepository(DefaultNexusConfiguration.java:786)	at org.sonatype.nexus.DefaultNexus.deleteRepository(DefaultNexus.java:281)