Hello!
Thanks for your reply!
Simon Kitching wrote on 14.03.2009 15:39:
Have you tried this? <t:selectItems value="#{myBean.allRoles}"/>
I have, but I get a NullPointerException if I do.
Caused by: java.lang.NullPointerException
at org.apache.catalina.connector.Request.getAttribute(Request.java:877)
at
org.apache.catalina.connector.RequestFacade.getAttribute(RequestFacade.java:263)
at
javax.servlet.ServletRequestWrapper.getAttribute(ServletRequestWrapper.java:82)
at
org.apache.myfaces.context.servlet.RequestMap.getAttribute(RequestMap.java:47)
at
org.apache.myfaces.util.AbstractAttributeMap.put(AbstractAttributeMap.java:104)
at
org.apache.myfaces.util.AbstractAttributeMap.put(AbstractAttributeMap.java:38)
at
org.apache.myfaces.custom.selectitems.AbstractUISelectItems.putIteratorToRequestParam(AbstractUISelectItems.java:131)
at
org.apache.myfaces.custom.selectitems.AbstractUISelectItems.createSelectItems(AbstractUISelectItems.java:107)
at
org.apache.myfaces.custom.selectitems.AbstractUISelectItems.getValue(AbstractUISelectItems.java:75)
at
org.apache.myfaces.shared_impl.util.SelectItemsIterator.hasNext(SelectItemsIterator.java:128)
at
org.apache.myfaces.shared_impl.renderkit.RendererUtils.internalGetSelectItemList(RendererUtils.java:557)
at
org.apache.myfaces.shared_impl.renderkit.RendererUtils.getSelectItemList(RendererUtils.java:542)
at
org.apache.myfaces.shared_impl.renderkit.html.HtmlCheckboxRendererBase.renderCheckboxList(HtmlCheckboxRendererBase.java:117)
at
org.apache.myfaces.shared_impl.renderkit.html.HtmlCheckboxRendererBase.encodeEnd(HtmlCheckboxRendererBase.java:65)
at
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:624)
... 76 more
Looking at the actual implementation of the t:selectItems tag, I think
this is consistent (it sets the current map value to the request under
the provided variable name and then calls a method which retrieves this
and tries to get the label and value for the select item -- this fails
if no variable name is given). It just doesn't fit what the tag is
supposed to do as per the documentation, at least as I understand it.
I could simply built the list of SelectItem instances myself and set
this in my bean. But I actually wouldn't want to handle more of the
internal UI elements than necessary, so if the tag could do this, I
think that would be the better approach. I also wonder if the
documentation is wrong here or the tag class (a matter of perspective, I
guess). ;-)
Regards,
Johannes Ruthenberg
