java - h:dataTable binding => duplicate ID -

i have problem using htmldatatable viewing data database.

when create component, table has (not always) twice number of columns.

it shown correctly , after several refreshes (without move in dtb or something) there example 6 columns instead of 3 , application (sometimes) become unstable. since time can't work table because reports "duplicate id component"..

simple example (source: http://balusc.blogspot.com/2006/06/using-datatables.html):

<h:form id="bde">       <h:datatable id="tbl"                    binding="#{mybde.datatable}"                    value="#{mybde.datalist}"                     var="bdeitem">       <h:column>         <f:facet name="header">           <h:outputtext value="s" />         </f:facet>         <h:outputtext value="#{bdeitem.s}" rendered="#{!mybde.editmoderow}"/>         <h:inputtext value="#{bdeitem.s}" rendered="#{mybde.editmoderow}" required="true" size="3"/>       </h:column>        <h:column>         <f:facet name="header">            <h:outputtext value="id" />         </f:facet>         <h:outputtext value="#{bdeitem.id}"/>       </h:column>     </h:datatable>   </h:form>  

and java.class

protected htmldatatable datatable;    public void setdatatable(htmldatatable datatable)    {     this.datatable = datatable;   }    public htmldatatable getdatatable()    {     if (datatable == null)      {        datatable = new htmldatatable();        datatable.setrows(default_table_rows);      }      return datatable;   }  

and error message:

javax.servlet.servletexception: component id j_idt92:bde:tbl:j_idt129 has been found in view.         javax.faces.webapp.facesservlet.service(facesservlet.java:422)    root cause    java.lang.illegalstateexception: component id j_idt92:bde2:tbl:j_idt129 has been found in view.         com.sun.faces.util.util.checkiduniqueness(util.java:821)       com.sun.faces.util.util.checkiduniqueness(util.java:805)       com.sun.faces.util.util.checkiduniqueness(util.java:805)       com.sun.faces.util.util.checkiduniqueness(util.java:805)       com.sun.faces.util.util.checkiduniqueness(util.java:805)       com.sun.faces.util.util.checkiduniqueness(util.java:805)       com.sun.faces.application.view.statemanagementstrategyimpl.saveview(statemanagementstrategyimpl.java:144)       com.sun.faces.application.statemanagerimpl.saveview(statemanagerimpl.java:133)       com.sun.faces.application.view.writebehindstatewriter.flushtowriter(writebehindstatewriter.java:225)       com.sun.faces.application.view.faceletviewhandlingstrategy.renderview(faceletviewhandlingstrategy.java:418)       com.sun.faces.application.view.multiviewhandler.renderview(multiviewhandler.java:131)       com.sun.faces.lifecycle.renderresponsephase.execute(renderresponsephase.java:121)       com.sun.faces.lifecycle.phase.dophase(phase.java:101)       com.sun.faces.lifecycle.lifecycleimpl.render(lifecycleimpl.java:139)       javax.faces.webapp.facesservlet.service(facesservlet.java:410)   

followed tree of components. thing there's nothing duplicated in code, datatable create new columns , after it's duplicated

i have 2 working similar modules, , third doesn´t work.

have ever met kind of problem?

thanks advice

this can happen if bean session scoped instead of request scoped , you're sharing bean among multiple views. best keep bean component been bound in request scope.

as alternative, can use datamodel value instead of binding table htmldatatable if functional requirement selected row.