fnproject.io Java functions accept primitve Java types per default. In this screencast JSON-P from Java EE 8 is used to serialize and deserialize parameters and return values from Java streams to JsonObjects (in 9mins):
Web Apps, SPA, PWA with vanilla Java Script (ES 6+), CSS 3 and WebStandards only. As simple as possible, but not simpler. See you at: (Progressive) Web apps, Single Page Apps and WebStandards airhacks workshops at MUC airport, Winter Edition
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