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What is the difference between JavaScript & React in terms of security?

I am currently using two different Ethernet network switches: (1) Netgear FS728TLP and (2) Aruba 2930M. Both of the Ethernet network switches have a Web interface and something called a “device view”.

A “device view” allows someone to see a picture of the Ethernet network switch and also in real-time shows which ports are active and plugged in, here is an example in the PDF on page 15 (“device view”):
http://www.downloads.netgear.com/files/GDC/FS526TV2/FSSmartSwitches_UG_2Sep2013.pdf

The Aruba 2930M switch shows the device view just fine in all the different Web browsers. The implementation of this on the Aruba 2930M is done in React.js. Now, the Netgear FS728TLP does not show “device view”. The implementation is done in “Java Script”. The error that I am getting is “Application is Bloacked by Java Security”.

JavaSecurityError

OK, so here is the question. If React.js is java script, why is it that I am not getting Java security errors with the Aruba 2930M (React.js implementation of device view) and why is it that I am getting security errors with Netgear FS728TLP?

What is the difference between Java Script and React.js in terms of security?