-a- what / how you install processing,
-b- did you test
java -version
like on Raspberry Pi
have 3 way,
- a image
- a curl command ( i used )
- a tar file
and on
pi@RPI3BP:~ $ java -version
java version “1.8.0_65”
Java™ SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot™ Client VM (build 25.65-b01, mixed mode)
i understand you think you might be lucky if someone here use the same board,
but did you try to ask other board users like at
https://forum.pine64.org ?