#{conversation.id} instead of #{javax.enterprise.context.conversation.id} mentioned in the reference guide

http://docs.jboss.org/weld/reference/latest/en-US/html/scopescontexts.html#d0e1884

on the line "<a href="/addProduct.jsp?cid=#

">Add Product</a>"

and in the sentence "The unique identifier of the conversation may be obtained from the Conversation object, which has the EL bean name conversation. "