Effective way to pass JSON between java and javascript

Question

I\'m fairly new to Nashorn and scripting on top of the JVM and wanted to know if I can get my java code and javascripts to communicate more effectively.

I\'m using a 3rd

Answer 1

Nashorn treats java.util.Map objects specially. Nashorn allows Map keys to be treated as "properties". See also https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions#Nashornextensions-SpecialtreatmentofobjectsofspecificJavaclasses

So if your map contains "foo" as key, script can access mapObj.foo to get it's value. It does not matter the script you evaluated is third-party one. As long as the script is evaluated by Nashorn, nashorn will specially link Map property access and get the result you want. This approach avoid unnecessary JSON string conversion and parse round trip (as you yourself mentioned).