How to access environment variable when runing a groovy script ?

My IDEA version is Community Edition 10.0.2 . I need to acces some environment variables in my groovy script, for example, I have to get the value of 'HADOOP_HOME'. So I set the environment variable in the running configura dialog. But the statement "println System.getenv('HADOOP_HOME')" just gives me the null value.
However,in a java program in which i use the statement 'System.out.prinltn(System.getenv("HADOOP_HOME");' I can get the right value.
Is it a bug ? Or have I missed any confguration?

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