Hello Christopher,
There's a setting you can configure in the JBoss application server. Please check the platform's Installation Checklist Tuning section, for the correspondent platform version and application server version. There's a step indicating the file and setting to change.
For instance, in platform 9.1 checklist in http://www.outsystems.com/goto/checklist-9.1-JEE, it refers to the setting max-post-size on the file /usr/share/jbossas/standalone/configuration/standalone-outsystems.xml
Hope this helps.
Cheers
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