Access user defined environment variable in JAVA

How to access user defined environment variable in JAVA1.4.2_12?I use System.getProperty() function, but it return null. Also getenv() method not working.Can anyone suggest somethig?Thanks.
[217 byte] By [Royalmana] at [2007-11-27 6:40:53]
# 1
See http://forum.java.sun.com/thread.jspa?threadID=5180868&tstart=0
java_2006a at 2007-7-12 18:10:16 > top of Java-index,Desktop,Runtime Environment...