jsf 2 - "empty" IllegalArgumentException with nested JSF h:panelGroups and f:ajax -


i'm having problems updating inner nested h:panelgroup element using f:ajax. have minimized problem following example:

<h:form id="someform">     <h:panelgroup id="wrapper">         <h:panelgroup id="content">             content         </h:panelgroup>     </h:panelgroup>      <h:commandlink         action="#{bean.changecontent()}"         value="do something">         <f:ajax render=":someform:wrapper:content"/>     </h:commandlink> </h:form>

when try open page, findcomponent method throws illegalargumentexception no further information:

severe:   error rendering view[/view/group/invitation/testcase.xhtml]     java.lang.illegalargumentexception: wrapper @ javax.faces.component.uicomponentbase.findcomponent(uicomponentbase.java:655) @ com.sun.faces.renderkit.html_basic.ajaxbehaviorrenderer.getresolvedid(ajaxbehaviorrenderer.java:302) @ com.sun.faces.renderkit.html_basic.ajaxbehaviorrenderer.appendids(ajaxbehaviorrenderer.java:292) @ com.sun.faces.renderkit.html_basic.ajaxbehaviorrenderer.buildajaxcommand(ajaxbehaviorrenderer.java:225) @ com.sun.faces.renderkit.html_basic.ajaxbehaviorrenderer.getscript(ajaxbehaviorrenderer.java:89) ...

i looked implementation , found following section causing exception:

... result = findcomponent(base, segments[i], (i == 0)); // first element of expression may match base.id // (vs. child if of base) if (i == 0 && result == null && segments[i].equals(base.getid())) {     result = base; } if (result != null && (!(result instanceof namingcontainer)) && length > 0) {     throw new illegalargumentexception(segments[i]); } ...

i debugged program, component found (by first line of code above), conclusion h:panelgroup not instance of namingcontainer, after reading this post , checking generated html other examples understanding h:panelgroup naming container. however, when remove wrapper , tell ajax element update content panelgroup directly, no exception thrown. don't understand method jsf uses search through elements, i'd appreciate if explain me why tiny example behaves way. using mojarra 2.2.0 on glassfish 4.0

when want update/render component same h:form don't need attach form id component id.
in case 

<f:ajax render="content"/>

would job you.

and h:panelgroup not namingcontainer component. dont need refer inner components of h:panelgroup nesting id.

so <h:panelgroup id="content"> can referred out side form someform:content.
someform:wrapper:content wrong thing. reason getting exception.

you can find out generated component id on browser right click , inpect element.


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