java.lang.ClassCastException: java.util.Vector cannot be cast to javax.faces.application.FacesMessage
at javax.faces.component.UIData.hasErrorMessages(UIData.java:554)
at javax.faces.component.UIData.encodeBegin(UIData.java:534)
at javax.faces.component.html.HtmlDataTable.encodeBegin(HtmlDataTable.java:47)
at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:513)
at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:520)
at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:520)
...


Caused by code in the BridgeFacesContext

 public Iterator getMessages() {
        return faceMessages.values().iterator();
 }

The faceMessages hashmap contains a vector of messages, not FacesMessages, therefore the contents of each vector must be concatenated into a return buffer. I have a fix, just need a jira case to commit against.