从Java读取时Linux / bash环境变量为null

Question

In Ubuntu I have exported the below environment variable in ~/.bashrc :

export MY_VAR="MY_VAR_VALUE"

When I re-open a terminal I can do:

~ $ echo $MY_VAR
MY_VAR_VALUE
~ $ 

But when I do this in Java/Eclipse (which I have restarted after exporting the test env. var):

String myVar = System.getenv("MY_VAR");
System.out.println(myVar);

I just get null . Does eclipse not see variables set in ~/.bashrc ?

Answer 1

In Linux (unlike Windows) you need a direct child relatinship between the Java executable, started by Eclipse, started by the Shell where you have exported the variable.

So you must start Eclipse from within that Shell. It wont work if you doubleclick on the executable in desktop or menu.

But I would specify the environment variables you need in the run configuration and not rely on such a setup.