JAVA_HOME Windows vs. Mac

Was wondering if anyone can answer a quick shiny server question. It's about communicating with Java on a mac. On windows the following code works:

Sys.setenv(JAVA_HOME='C:\Program Files\Java\jre1.8.0_211')

When adjusted for mac I can't seem to get it working or nail down the correct path:

Sys.setenv(JAVA_HOME='/Library/Java//Home')

Does anyone know how to point to java when running on mac (feel free to offer linux path as well)? Thanks everyone!