Why the componeng id exists in the view when create a dynmaic table?

In the first page, i add a command button to create a managed bean containing a UIData component, whose the struture is dynamic in runtime, and then forward to other page to show the UIData:
JSP code:
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<f:view>
<body>
<h:form id="welcomeform">
<h:commandButton value="jump" action="#{welcomeForm.execute}"/>
</h:form>
</body>
</f:view>JAVA code:
package com.savage.dynweb;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
public class WelcomePage {
public String execute() {
DynPage dynPage = new DynPage();
dynPage.init();
FacesContext context = FacesContext.getCurrentInstance();
ValueBinding vb = context.getApplication().createValueBinding("#{requestScope.dynPage}");
vb.setValue(context, dynPage);
return "success";
}faces-config.xml:
<managed-bean>
<managed-bean-name>welcomeForm</managed-bean-name>
<managed-bean-class>com.savage.dynweb.WelcomePage</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<navigation-rule>
<from-view-id>/pages/test.jsp</from-view-id>
<navigation-case>
<from-outcome>success</from-outcome>
<to-view-id>/pages/dynpage.jsp</to-view-id>
</navigation-case>
</navigation-rule>dynpage.jsp code:
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<f:view>
<body>
<h:form id="dynform">
<h:dataTable binding="#{dynPage.dynTable }" var="row" value="#{dynPage.records }"/>
<h:commandButton value="next" actionListener="#{dynPage.execute}"/>
</h:form>
</body>
</f:view>DynPage.java:
package com.savage.dynweb;
import java.util.*;
import javax.faces.application.Application;
import javax.faces.component.*;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.faces.event.ActionEvent;
public class DynPage {
private UIData dynTable;
private List<Map<String, String>> records;
public void init() {
String[] headers = new String[] {"name", "age", "sex", "birthday"};
records = new ArrayList<Map<String, String>>(10);
for(int i = 0; i < 10; i++) {
Map<String, String> record = new HashMap<String, String>(4);
record.put("name", "name" + i);
record.put("age", "age" + i);
record.put("sex", "sex" + i);
record.put("birthday", "birthday" + i);
records.add(record);
FacesContext.getCurrentInstance().getViewRoot().getChildren().clear();
Application app = FacesContext.getCurrentInstance().getApplication();
dynTable = new UIData();
for(String header : headers) {
UIColumn column = new UIColumn();
UIOutput output = new UIOutput();
ValueBinding vb = app.createValueBinding("#{requestScope.row." + header + "}");
output.setValueBinding("value", vb);
UIOutput facet = new UIOutput();
facet.setValue(header);
column.setHeader(facet);
column.getChildren().add(output);
dynTable.getChildren().add(column);
public void execute(ActionEvent event) {
init();
public UIData getDynTable() {
return dynTable;
public void setDynTable(UIData dynTable) {
this.dynTable = dynTable;
public List<Map<String, String>> getRecords() {
return records;
public void setRecords(List<Map<String, String>> records) {
this.records = records;
}face-config.xml:
<managed-bean>
<managed-bean-name>dynPage</managed-bean-name>
<managed-bean-class>com.savage.dynweb.DynPage</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>when I click the next button at the dynpage.jsp, it raised a exception:
java.lang.IllegalStateException: ******************ID "dynform:_id0:_id4"(means the ID "dynform:id0:_id4" has been existed in the view)��
com.sun.faces.application.StateManagerImpl.checkIdUniqueness(StateManagerImpl.java:201)
com.sun.faces.application.StateManagerImpl.checkIdUniqueness(StateManagerImpl.java:204)
com.sun.faces.application.StateManagerImpl.checkIdUniqueness(StateManagerImpl.java:204)
com.sun.faces.application.StateManagerImpl.saveSerializedView(StateManagerImpl.java:97)
com.sun.faces.taglib.jsf_core.ViewTag.doAfterBody(ViewTag.java:189)
org.apache.jsp.pages.dynpage_jsp._jspx_meth_f_005fview_005f0(dynpage_jsp.java:104)
org.apache.jsp.pages.dynpage_jsp._jspService(dynpage_jsp.java:67)
But when i append a code:
FacesContext.getCurrentInstance().getViewRoot().getChildren().clear();
in the method:init(), everything is ok, why?
Can anyone to tell me the why it raise the exception, and why I clear the children of the UIViewRoot, the exception is gone.

Hi Frank,
Thank you and it can work.
public void setLowHighSalaryRangeForDetailEmployeesAccessorViewObject(Number lowSalary,
                                                                          Number highSalary) {
        Row r = getCurrentRow();
        if (r != null) {
            RowSet rs = (RowSet)r.getAttribute("EmpView");
            if (rs != null) {
                ViewObject accessorVO = rs.getViewObject();
                accessorVO.setNamedWhereClauseParam("LowSalary", lowSalary);
                accessorVO.setNamedWhereClauseParam("HighSalary", highSalary);
            executeQuery();
but I have a quesiton in this way. in code snippet, it is first getting current row of current master VO to determine if update variables value of detail VO. in my case, current row is possibly null after executeQuery() of master VO and I have to change current row manually like below.
any idea?
            DCIteratorBinding dc = (DCIteratorBinding)ADFUtil.evaluateEL("#{bindings.SSForecastSourceBlockView1Iterator}");
            ViewObject vo = dc.getViewObject();
            vo.ensureVariableManager().setVariableValue("DateFrom", dateFrom);
            vo.ensureVariableManager().setVariableValue("DateTo", dateTo);
            vo.ensureVariableManager().setVariableValue("ShiftModeCode", shiftModeC);
            vo.ensureVariableManager().setVariableValue("TerminalCode", terminalCode);
            vo.executeQuery();
            vo.setCurrentRowAtRangeIndex(0);
            ((SSForecastSourceBlockViewImpl)vo).synchornizeAccessorVOVariableValues();

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