[...]
Caused by: org.apache.commons.lang.exception.NestableRuntimeException: javax.xml.transform.TransformerException: java.util.ConcurrentModificationException
	at org.apache.cocoon.transformation.TraxTransformer.endDocument(TraxTransformer.java:604)
	at org.apache.cocoon.xml.AbstractXMLPipe.endDocument(AbstractXMLPipe.java:56)
	at org.apache.cocoon.sitemap.ContentAggregator.generate(ContentAggregator.java:133)
	at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:579)
	... 41 more
Caused by: javax.xml.transform.TransformerException: java.util.ConcurrentModificationException
	at org.apache.xalan.extensions.ExtensionHandlerJavaClass.callFunction(ExtensionHandlerJavaClass.java:417)
	at org.apache.xalan.extensions.ExtensionHandlerJavaClass.callFunction(ExtensionHandlerJavaClass.java:440)
	at org.apache.xalan.extensions.ExtensionsTable.extFunction(ExtensionsTable.java:222)
	at org.apache.xalan.transformer.TransformerImpl.extFunction(TransformerImpl.java:473)
	at org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:208)
	at org.apache.xpath.XPath.execute(XPath.java:337)
	at org.apache.xalan.templates.AVTPartXPath.evaluate(AVTPartXPath.java:135)
	at org.apache.xalan.templates.AVT.evaluate(AVT.java:499)
	at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1353)
	at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2400)
	at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1376)
	at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2400)
	at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1376)
	at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:395)
	at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:178)
	at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:395)
	at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:178)
	at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2400)
	at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2270)
	at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1356)
	at org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3447)
	at org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:408)
	at org.apache.cocoon.xml.AbstractXMLPipe.endDocument(AbstractXMLPipe.java:56)
	at org.apache.cocoon.transformation.TraxTransformer.endDocument(TraxTransformer.java:586)
	... 44 more
Caused by: java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
	at java.util.AbstractList$Itr.next(AbstractList.java:343)
	at java.util.AbstractList.hashCode(AbstractList.java:526)
	at org.ametys.runtime.plugins.core.ui.js.AllJSComponent.getHashCode(AllJSComponent.java:83)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.xalan.extensions.ExtensionHandlerJavaClass.callFunction(ExtensionHandlerJavaClass.java:367)
	... 67 more