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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 org.sakaiproject.component.app.messageforums.ui.PrivateMessageManagerImpl.findUnreadMessageCount(PrivateMessageManagerImpl.java:892)	at sun.reflect.GeneratedMethodAccessor3414.invoke(null:-1)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy23.findUnreadMessageCount(null:-1)	at org.sakaiproject.tool.messageforums.PrivateMessagesTool.getDecoratedForum(PrivateMessagesTool.java:466)	at sun.reflect.GeneratedMethodAccessor3646.invoke(null:-1)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.sun.faces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:79)	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:173)	at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)	at javax.faces.component.UIData.getValue(UIData.java:527)	at javax.faces.component.UIData.getDataModel(UIData.java:856)	at javax.faces.component.UIData.setRowIndex(UIData.java:379)	at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:65)	at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:683)	at javax.faces.component.UIData.encodeBegin(UIData.java:681)	at javax.faces.webapp.UIComponentTag.encodeBegin(UIComponentTag.java:591)	at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:543)	at com.sun.faces.taglib.html_basic.DataTableTag.doEndTag(DataTableTag.java:491)	at org.apache.jsp.jsp.privateMsg.pvtMsgHpView_jsp._jspx_meth_h_005fdataTable_005f0(pvtMsgHpView_jsp.java:920)	at org.apache.jsp.jsp.privateMsg.pvtMsgHpView_jsp._jspx_meth_h_005fform_005f0(pvtMsgHpView_jsp.java:276)	at org.apache.jsp.jsp.privateMsg.pvtMsgHpView_jsp._jspx_meth_sakai_005fview_005f0(pvtMsgHpView_jsp.java:233)	at org.apache.jsp.jsp.privateMsg.pvtMsgHpView_jsp._jspx_meth_f_005fview_005f0(pvtMsgHpView_jsp.java:200)	at org.apache.jsp.jsp.privateMsg.pvtMsgHpView_jsp._jspService(pvtMsgHpView_jsp.java:167)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:659)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:457)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:395)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:311)	at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)	at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)	at org.sakaiproject.jsf.app.SakaiViewHandler.renderView(SakaiViewHandler.java:154)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:598)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:659)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:457)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:395)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:311)	at org.sakaiproject.tool.messageforums.MessageForumsFilePickerServlet.dispatch(MessageForumsFilePickerServlet.java:166)	at org.sakaiproject.jsf.util.JsfTool.doGet(JsfTool.java:241)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:598)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:659)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:457)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:359)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:311)	at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:511)	at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1429)	at org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:204)	at org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:96)	at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:862)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:659)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:581)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:775)	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:704)	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:897)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)	at java.lang.Thread.run(Thread.java:619)