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I find a  solution: 
put the  

session.invalidate

before unwanted part of the .jsp page (like some table)

Hi, 

To prevent duplicate form submission on refresh of your page you can set below property in liferay-portlet.xml: 

<action-url-redirect>true</action-url-redirect>

By default it's value is false. 

It is difficult to prevent the page from resubmission.