I have my /etc/environment as follows
APP="/opt/apps/"
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
JAVA_HOME="/usr/lib/jvm/java-8-oracle"
I have sourced source /etc/environment on my machine. I am able to get the output when I type echo $APP on terminal
But When I call it from inside a java file
LOGGER.error("APP: " + System.getenv("APP"));
LOGGER.error("PATH: " + System.getenv("PATH"));
LOGGER.error("JAVA_HOME: " + System.getenv("JAVA_HOME"));
I get only the output of PATH but not the other 2 env variables.
OUTPUT
2017-12-18 07:22:10 ERROR JRWebService:127 - APP: null
2017-12-18 07:22:10 ERROR JRWebService:128 - PATH:/ usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
2017-12-18 07:22:10 ERROR JRWebService:129 - JAVA_HOME: null
Please correct me what am I doing wrong
It sounds like APP and JAVA_HOME are not exported. With unix shells, there is a difference between set (variable is visible in your current shell) and export (variable is visible to all sub-processes). If you just type "X=Y", X it is set, but not exported. PATH is mostly exported somewhere already.
You can test this by running "export | grep APP" in your console. If APP doesn't show up, the variable will not be visible to java, or any other program you run, even though echo $APP works just fine.
If this is the case, simply add "export APP" to your .profile, or the script with which you are starting your java application (or to test, simply type that on the console before you start java).