[jboss-user] [JBoss jBPM] - [Workaround] Re: Combo Box in Form
"kukeltje" wrote : please.... what is so difficult about my previous post....
this is JSF stuff, not jBPM. So please ask in the correct forum and learn JSF!!!!
I wouldn't say this is totally wrong, but it is pretty far away from the truth, as
jBPM is probably very well involved in this problem.
I ran into the same problem today, and spent many hours to figure this out. There are many
postings in this forum, but not a solution. I will describe a workaround and one possible
cause for this problem.
Setup:
jbpm-3.2.1-ear on jboss 4.0.4
Same problem as Riket44: After adding a collection of SelectItem as a process variable
like this in an actionhandler
| Collection selectItems=new ArrayList();
| selectItems.add(new SelectItem("BLA","Fasel"));
| selectItems.add(new SelectItem("BLoe","Fasel2"));
|
executionContext.getContextInstance().createVariable("selectit1",selectItems);
|
using it in a task form like this:
| ...
| <h:selectOneMenu id="bla22"
value="#{var['userselection']}">
| <f:selectItems value="#{var['selectit1']}" />
| </h:selectOneMenu>
| ...
|
got me this Exception:
| java.lang.IllegalArgumentException: Argument Error: An option for component j_id48 was
not an instance of javax.faces.model.SelectItem. Type found: java.util.ArrayList.
|
I also tried
* List of SelectItem
* Collection of SelectItem
* SelectItem []
,all with similar Exceptions.
When I changed the form to
| <h:selectOneMenu id="bla22"
value="#{var['userselection']}">
| <f:selectItem value="#{var['selectit1'][0]}" />
| </h:selectOneMenu>
|
I got this very nice Exception:
| java.lang.IllegalArgumentException: "Argument Error: An option for component
bla22 was not an instance of javax.faces.model.SelectItem. Type found:
javax.faces.model.SelectItem.
| at com.sun.faces.renderkit.RenderKitUtils.getSelectItems(RenderKitUtils.java:315)
|
Wow. How is that? It is not a SelectItem, it is a SelectItem!
Looking at RenderKitUtils.java I found that the comparison
(value instanceof SelectItem) must have returned false. This is weired, because
instances of javax.faces.model.SelectItem is exactly what has been put into the collection
in the actionhandler.
I am not sure what causes this. I first thought that it would be a persistence-related
classloading problem (persistence layer using myfaces-jars from tomcat-sar instead of
sun's ri vom jbpm-ear), but that doesn't seem to the problem: I replaced the
myfaces-jars in tomcat-sar/jsf-libs with the sun-ri-jars, but that didn't help.
Any ideas? I would love to here the solution to this (not only, but especially from Ronald
(time to prove that this is a JSF-problem ;-)) ?
Ah, I promised a workaround:
Furtheron in the code, I found that the value attribute of SelectItems also takes a map
(key->label, value->value). So I tried this one, and that worked like it was
expected to be:
Put
| Map mymap=new HashMap();
| mymap.put("bla", "fasel");
| executionContext.getContextInstance().createVariable("selectit1",mymap);
|
in the handler.
And the snippet
| <h:selectOneMenu id="bla22"
value="#{var['userselection']}">
| <f:selectItems value="#{var['selectit1']}" />
| </h:selectOneMenu>
|
in the form.
Hope this helps, but I would very much appreciate a proper solution!
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