Display exception from an event listener aboutToCreate in webui Polymer

[Yasir_]

Hi,

I would like to know how to catch an exception in the front with web-ui Polymer, in case of an event handler aboutToCreate for example.

In my listener :

• I rollback (it works)
• I add in contextData map a message, but this message does not display on the UI
• i throw the exception but the message does not display on the UI

        DocumentEventContext ctx = (DocumentEventContext) event.getContext();
        DocumentModel doc = ctx.getSourceDocument();
        doc.getContextData().putAll(data);

    	TransactionHelper.setTransactionRollbackOnly();
    	event.markRollBack();
       throw new NuxeoException(e.getMessage(), e);

Thanks for any help