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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:462)	at java.util.AbstractList$Itr.next(AbstractList.java:433)	at com.dm.model.DealAssociatedService.someMethod(DealAssociatedService.java:761)	at com.dm.ui.AssociatedBean.getPerformanceDocs(AssociatedDocsBean.java:139)	at sun.reflect.GeneratedMethodAccessor666.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:62)	at java.lang.reflect.Method.invoke(Method.java:391)	at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl.java:457)	at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:85)	at org.apache.myfaces.custom.security.SecurityContextPropertyResolver.getValue(SecurityContextPropertyResolver.java:101)	at com.sun.faces.el.impl.ArraySuffix.evaluate(ArraySuffix.java:167)	at com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:151)	at com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:243)	at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:156)	at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:137)	at javax.faces.component.UIData.getValue(UIData.java:527)	at org.apache.myfaces.component.html.ext.HtmlDataTableHack.createDataModel(HtmlDataTableHack.java:437)	at org.apache.myfaces.component.html.ext.HtmlDataTable.createDataModel(HtmlDataTable.java:847)	at org.apache.myfaces.component.html.ext.HtmlDataTableHack.getDataModel(HtmlDataTableHack.java:414)	at org.apache.myfaces.component.html.ext.HtmlDataTable.getDataModel(HtmlDataTable.java:839)	at org.apache.myfaces.component.html.ext.HtmlDataTableHack.getRowCount(HtmlDataTableHack.java:87)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeInnerHtml(HtmlTableRendererBase.java:226)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlTableRendererBase.java:134)	at org.apache.myfaces.renderkit.html.ext.HtmlTableRenderer.encodeChildren(HtmlTableRenderer.java:187)	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:743)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:414)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChildren(RendererUtils.java:400)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:417)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChildren(RendererUtils.java:400)	at org.apache.myfaces.renderkit.html.ext.HtmlGroupRenderer.encodeEnd(HtmlGroupRenderer.java:66)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:762)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:419)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.renderChildren(HtmlGridRendererBase.java:229)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.encodeEnd(HtmlGridRendererBase.java:101)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:762)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:419)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChildren(RendererUtils.java:400)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:417)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChildren(RendererUtils.java:400)	at org.apache.myfaces.renderkit.html.ext.HtmlGroupRenderer.encodeEnd(HtmlGroupRenderer.java:66)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:762)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:419)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.renderChildren(HtmlGridRendererBase.java:229)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.encodeEnd(HtmlGridRendererBase.java:101)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:762)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:419)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChildren(RendererUtils.java:400)	at org.apache.myfaces.renderkit.html.ext.HtmlGroupRenderer.encodeEnd(HtmlGroupRenderer.java:66)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:762)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:419)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.renderChildren(HtmlGridRendererBase.java:229)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.encodeEnd(HtmlGridRendererBase.java:101)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:762)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:419)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChildren(RendererUtils.java:400)	at org.apache.myfaces.renderkit.html.ext.HtmlGroupRenderer.encodeEnd(HtmlGroupRenderer.java:66)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:762)	at org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:419)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.renderChildren(HtmlGridRendererBase.java:229)	at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.encodeEnd(HtmlGridRendererBase.java:101)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:762)	at javax.faces.webapp.UIComponentTag.encodeEnd(UIComponentTag.java:611)	at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:534)	at org.apache.myfaces.shared_tomahawk.taglib.UIComponentBodyTagBase.doEndTag(UIComponentBodyTagBase.java:57)	at com.ibm._jsp._associatedDocs._jspx_meth_t_panelGrid_0(_associatedDocs.java:2277)	at com.ibm._jsp._associatedDocs._jspService(_associatedDocs.java:201)	at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJspBase.java:93)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)	at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1793)	at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1742)	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:113)	at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:82)	at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:882)	at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:121)	at com.ibm.ws.jsp.webcontainerext.JSPExtensionServletWrapper.handleRequest(JSPExtensionServletWrapper.java:222)	at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:347)	at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:325)	at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:211)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:220)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:118)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)	at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1793)	at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1742)	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:136)	at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147)	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:142)	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:121)	at com.cgi.dm.extworkplace.util.UTF8EncodingFilter.doFilter(UTF8EncodingFilter.java:25)	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:142)	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:121)	at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:82)	at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:882)	at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)	at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1937)	at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:120)	at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:434)	at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:373)	at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:101)	at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:566)	at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:619)	at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:952)	at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)	at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1498)