1. In a web application add Push component to a page and start to consume to any Topic by accessing that page.
2. Create a Serializable class in the web application.
3. Populate & Publish that Serializable object from an external client to that topic so that the resulting message can be consumed by the Push Component.
4. You will see JMSException thrown from  org.richfaces.application.push.impl.jms.RequestImpl.serializeMessage(Topic, Message)

You may use the attached sample application to test.

Please feel comfortable to review & vote the issue at RF-11377 that I have posted in this regard.