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I've added a ticket for this. Should land in the repo within the next 1-2weeks. https://www.assembla.com/spaces/bryntum/tickets/569 . If you're familiar with c# you can check our asp export example and try rewriting this to java.
JavaScript/Angular/ExtJS consulting - kuba@virtualdesign.pl
I've ported the export script to Java servlet in a Scheduler example, so you can use it also with our Java Gantt example : https://forum.bryntum.com/viewtopic.php?f=4&t=2955
JavaScript/Angular/ExtJS consulting - kuba@virtualdesign.pl