Duplicate id problem in ExtendedDatatable with dynamic columns -------------------------------------------------------------- Key: RF-12762 URL: https://issues.jboss.org/browse/RF-12762 Project: RichFaces Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 4.3.0.CR1 Environment: Windows 7 , weblogic10.4.3, Myfaces 2.1.10, IE 9, FireFox 14.0.1 Reporter: blam lam Priority: Critical Fix For: 5-Tracking When the ExtendedDataTable contains dynamic columns (i.e. using for:each), "java.lang.IllegalStateException: component with duplicate id" will occur after the second submit from a commandButton. The problem does not appear in 4.2.3 Final but found in 4.3 CR1 Sample source code: {code} <h:form id="frmMarkUpdate"> <a4j:outputPanel id="resultPanel"> <rich:extendedDataTable id="studentVoMarkInputTab" value="#{updateMarkBean.studentVoMarkAmends}" var="studVo" selectionMode="none" height="100%"> <rich:column width="200px" > <f:facet name="header"> Status </f:facet> <h:outputText value="#{studVo.student.markAmendStatus}" /> </rich:column> <c:forEach items="#{updateMarkBean.taskVos}" var="tvo" varStatus="s"> <rich:column width="100px"> <f:facet name="header"> <h:outputText value="#{tvo.task.taskName}" /> </f:facet> <h:inputText id="task#{s.index}_amk" value="#{studVo.getTaskMarkMap().get(tvo.task.taskId).amendedMark}" size="1" maxlength="3"/> </rich:column> </c:forEach> </rich:extendedDataTable> <a4j:commandButton id="btnSave" value="Save" action="#{updateMarkBean.doBeforeSave}" styleClass="button blue"> </a4j:commandButton> </a4j:outputPanel> </h:form> {code}