I try to do that, but it does not work.
<logic:present name="MEMBER" >
<bean:message key="member.registerConfirmation" arg0='<bean:write name="MEMBRE_REGISTER" property="firstname"/>' arg1='<bean:write name="MEMBRE_REGISTER" property="lastname"/>'/>
</logic:present>
and bean:message contain:
member.registerConfirmation = Congratulations {0} {1}, you are in !
Try EL with bean:message
Something like this.