[jboss-user] [JBoss Seam] - conversations, propagations etc ... - need explanation

[amashtakov]

Hi,


I've started to experiment a bit with seam conversations in order
to develop some sort of global strategy and patterns, which I'm going to 
use in my application.

I developed a simple app with 2 pages:

page1.xhtml

  | <s:link value="start" action="#{conversation.begin}"/>
  | 

page2.xhtml simply displays #{conversationList} in h:dataTable
and includes 

  | ...
  | <s:link value="start again" propagation="begin"/>
  | 

I performed several tests and noticed the following:

1. With no code modifications:
     Step 1: clicking on "start" on page1.xhtml starts new conversation
     Step 2: clicking on "start again" on page2.xhml creates new 
                 conversation too.

    Actually, I expected "java.lang.IllegalStateException: begin() called from 
    long-running conversation, try join=true" on step 2, according with 
    the documentation. 

2. Changes in page2.xhtml:


  | ...
  | <s:link value="start again" propagation="join"/>
  | 

     Step 1: clicking on "start" on page1.xhtml starts new conversation
     Step 2: clicking on "start again" on page2.xhml joins current 
                 conversation

Can anyone explain why this happens ? From my point of view
step#2 in test#1 has to generate exception.

I'll appreciate a good explanation of seam algorithm/steps, which is/are
used in order to determine whether the long running conversation is 
active or not.

Thank you in advance,
/Alexander



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