NullPointerException in selectManyCheckbox

[merve klug]

  

------------these are real codes
<h:form rendered="#{testBean.control!='no'}">
                <h:selectManyCheckbox  id="checkbox" value="#{testBean.stringlist}"  border="0">
<f:selectItems  value="#{testBean.selectitemlist}" />
                </h:selectManyCheckbox>

               <h:commandButton id="submit" value="Delete"  action="#{testBean.action}"/>

</h:form>
----------these are(up) real codes

i delete the upper codes and write lines which is below

  
<%--------------------- these are debug codes

<h:form rendered="#{testBean.control!='no'}">
<h:dataTable value="#{testBean.stringlist}" var="doc">
    <h:column>
       <h:outputText value="#{doc}"/>
    </h:column>
</h:dataTable>--%>

<%--
<h:dataTable value="#{testBean.selectitemlist}" var="doc">
    <h:column>
       <h:outputText value="#{doc}"/>
    </h:column>
</h:dataTable>

</h:form>
--------------------- these are debug codes--%>

           

  

i can see the contents of lists.

but i get servlet exception and nullpointer exception

log is here:

exception

javax.servlet.ServletException
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)

root cause

java.lang.NullPointerException
	com.sun.faces.renderkit.html_basic.MenuRenderer.getCurrentSelectedValues(MenuRenderer.java:633)
	com.sun.faces.renderkit.html_basic.SelectManyCheckboxListRenderer.renderOption(SelectManyCheckboxListRenderer.java:265)
	com.sun.faces.renderkit.html_basic.SelectManyCheckboxListRenderer.encodeEnd(SelectManyCheckboxListRenderer.java:146)
	javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:836)
	javax.faces.component.UIComponent.encodeAll(UIComponent.java:896)
	javax.faces.render.Renderer.encodeChildren(Renderer.java:137)
	javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
	javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
	javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
	com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:245)
	com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:176)
	com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
	com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
    

how can i debug where is the null pointer?

and any idea to solve the issue would be appreciated.

thanks in advance.

[merve klug]

issue has been resolved. the problem was string list. i used a string array instead of string list so it is ok now.
thanks