Cannot dynamically choose a list of fragments to render using <render fragments="..."/>

Case 1) This works:
<render fragments="${requestScope.wasSpnNew ? 'cpartySweSettings' : 'cpartyDefSettings'}"/>
epending on the value of requestScope.wasSpnNew is rendering correctly either "cpartySweSettings" or "cpartyDefSettings" fragment.

Case 2) This does not work:
<render fragments="${requestScope.wasSpnNew ? 'cpartyDefSettings,cpartySweSettings,cpartyWritingConvs,cpartyInternalContacts' : 'cpartyDefSettings'}"/>
in this case it tries to render a fragment 'cpartyDefSettings,cpartySweSettings,cpartyWritingConvs,cpartyInternalContacts'

After debugging, I saw that the problem lies in the following piece of code:

package org.springframework.webflow.action
...
public class RenderAction extends AbstractAction {
...
protected Event doExecute(RequestContext context) throws Exception {
String[] fragments = new String[fragmentExpressions.length];
for (int i = 0; i < fragmentExpressions.length; i++)

{ Expression exp = fragmentExpressions[i]; fragments[i] = (String) exp.getValue(context); }

context.getFlashScope().put(View.RENDER_FRAGMENTS_ATTRIBUTE, fragments);
return success();
}
...
}

For both cases fragmentExpressions contains a single expression. For case 2) and requestScope.wasSpnNew == true, the expression gets correctly evaluated to the string "cpartyDefSettings,cpartySweSettings,cpartyWritingConvs,cpartyInternalContacts", but this string is just set as fragments[0], instead of being parsed as a comma separated list of fragments, so we end up with fragments array containing a single entry (

{ "cpartyDefSettings,cpartySweSettings,cpartyWritingConvs,cpartyInternalContacts" }

) instead of containing 4 entries (

{ "cpartyDefSettings","cpartySweSettings","cpartyWritingConvs","cpartyInternalContacts" }

) and of course afterwards Tiles is not finding a fragment "cpartyDefSettings,cpartySweSettings,cpartyWritingConvs,cpartyInternalContacts".