Can I change the default URCAP JavaSE-1.6(java-8-openjdk-amd64) version to JavaSE-1.8(java-8-openjdk-amd64)?
I did the change, recompiled the urcap in my machine and it worked like a charm , on my ubuntu virtual Polyscope. My polyscope is the 5.9.
If I can do it, what the advantage of disadvantage in doing it?
And If I can do it ,why the sdk examples came with the older version?
As stated here: Java versions used by PolyScope
You will get compatibility issues with the CB series. There is also more about the topic here: https://plus.universal-robots.com/urcap-basics/compatibility-chart-and-generations/