If the ChatMessage POJO is the XML you want, then you can let Camel automatic convert it to/from XML using JAXB (camel-jaxb) with the implicit type converters.

Though as you use CXF there is one caveat is that you need to convert POJO first. And then to XML afterwards, which you can convert to as a String.

<from uri="cxf:bean:serviceEndpoint?dataFormat=POJO"/>
<convertBodyTo type="com.pocesb.ChatMessage"></convertBodyTo>
<convertBodyTo type="String"></convertBodyTo>
<inOnly uri="activemq:topic:Producer"></inOnly>

But when sending to a JMS queue you can tell Camel which JMS message type to use. And if you say Text, then Camel will automatic convert to a String, so the route can be

<from uri="cxf:bean:serviceEndpoint?dataFormat=POJO"/>
<convertBodyTo type="com.pocesb.ChatMessage"></convertBodyTo>
<inOnly uri="activemq:topic:Producer?jmsMessageType=Text"></inOnly>

And on the consumer side you can convert to the POJO. Assuming the POJO class has JAXB annotations.

<from uri="activemqconsumercxf:queue:Consumer"/>
<convertBodyTo type="com.pocesb.ChatMessage"></convertBodyTo>

And the jmsMessageType option only applies to the producer, so we can remove that.