Order of portlets execution.

Hi..
I need info on "the order portlets in one portalpage would execute".
I am working on WLP7.0
 
There are 2 portlets in a page. 
Portlet1: Has a dropdown 
Portlet2: Displays content depending on the dropdown in Portlet1
 
The requirement is that the content in Portlet2 should change if the Portlet1.dropdown changes. So I would assume we would have a form submission. The dropdown's value will be stored in the session (for future use) which should be retrieved by Portlet2.
 
My question is: Can I be sure that the Portlet1 will be first executed before Portlet2 so that the session value can be picked up by portlet2.
 
I would much appreciate any guidances.
 
Thanks & regards, 
Jaya

The order of portlet execution is according to depth-first algorithm.
For example if you have a 2 column layout with portlet1 on left and portlet 2 on right, portlet1 will be executed first and portlet2 next and vice versa.
If you have a single column layout and have portlet 1 on top of portlet 2, then portlet 1 will be executed before portlet2. So if you want portlet 2 to listen to portlet 1 or grab anything that portlet 1 puts in session, you have to make sure you have them accordingly to comply with depth-first order. Or else you will end up getting Nullpointer exception in portlet 2.
The following cases work fine when portlet 2 has to listen to portlet1.
Case 1: two column layout
portlet1 | portlet2
Case 2: one column layout
porlet1
portlet2
The following cases wont work when portlet 2 listens to portlet 1 and will result in NullPointerException
case3:
portlet2 | porlet1
case 4:
portlet2
portlet1
Let me know if you need more info.
--SJ

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