windows - Getting environment variable value in java

Question

An environment variable has been set in windows machine (windows 7) and trying to get the value of the variable from the following java code. However, it returns a null value.

final String value = System.getenv("PE_CONF_PWD");
System.out.println(value);
//print null

Now if I execute the following code, it throws a security exception that means that the user does not have the variable.

SecurityManager m = new SecurityManager();
m.checkPropertyAccess("PE_CONF_PWD");
// java.security.AccessControlException: access denied ("java.util.PropertyPermission" "PE_CONF_PWD" "read") 

Later I have added permission in the JRE security policy file and add the following entry but still it returns null value.

permission java.lang.RuntimePermission "getenv.PE_CONF_PWD";

Answer 1

This code snippet should not return null in order for your problem to be resolved...

final String value = System.getenv("PE_CONF_PWD");