How to I obtain the value of the environment variables? [duplicate]

Question

Possible Duplicate:
Access shell environment variables Java

I've created a stand-alone java application in linux.

How can I obtain the value of the environment variables (e.g. assigned in the .bashrc file).

Answer 1

For obtaining only one System Variable use the following code:

 String sysEnvStr = System.getenv("JAVA_HOME");

If it returns null then make changes in your .bashrc file. Try exporting that particular variable.

Answer 2

See this howto:

// just one
System.out.println("PATH = " + System.getenv("PATH"));

// all of them
Map env = System.getenv();
for (Iterator it=env.entrySet().iterator(); it.hasNext(); ) {
   Map.Entry entry = (Map.Entry)it.next();
   System.out.println(entry.getKey() + " = " + entry.getValue());
}