/usr/local/lib/R/site-library/Rserve/java# ls -la
total 72
drwxrwxr-x 2 root staff 4096 Nov 2 14:26 .
drwxrwxr-x 8 root staff 4096 Nov 2 14:26 ..
-rw-rw-r– 1 root staff 32348 Nov 2 14:26 REngine.jar
-rw-rw-r– 1 root staff 29772 Nov 2 14:26 Rserve.jar
added in bashrc
export CLASSPATH=$CLASSPATH:/usr/local/lib/R/site-library/Rserve/java/REngine.jar:/usr/local/lib/R/site-library/Rserve/java/Rserve.jar