How to invalidate portlet session on logout?

Hello,
How do I invalidate all portlet sessions on logout?

in my logout.jsp in the portal I do the following
<%
    session.invalidate();
%>

This invalidates the "portal" session but my portlet sessions are not
invalidated.

I use objects with implement the HttpSessionBindingListener interface. These
should be called, when the user logs out and the portlet session is
invalidated. I need to do some cleanup for attributes I stored on the
portlet session.

Thank you for helping
Hub

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