I need to prevent double submit after ADD or EDIT record.

I know that xmlPortletFactory adds "<action-url-redirect>true</action-url-redirect>"  in liferay-portlet.xml to prevents double submit, but for other reasons, I had to disable action-url-redirect atribute.

I try to sendRedirect(request, response) at addXXXURL() process action but fails with :
"Set render parameter has already been called"

is there any workarround to prevent double submit without "action-url-redirect" attribute?

Thanks

This post didn't help me . If I use sendRedirect in xmlPortletFactory process action (addENTITY for example) => Exception :  "Set render parameter has already been called"

I need to disable action-url-redirect , if it's true, invoking portlet within modal windows doesn't work, action url like addEntityURL will not show ok.....for this reason I need to implement manual redirect.

Thanks for help