[Q] How to find Environment Variables?

[Michael T. Peterson]

Hi,

Does J2SE provide a standard class or facility for obtaining the values of
environment variables (e.g., as declared in a shell script)? I guess I'm
looking for something analogous to the System.Properties class, but for
environment symbols in the user's process space.

Thanks,

Michael

 

[Christophe Vanfleteren]

Hi,

Does J2SE provide a standard class or facility for obtaining the values of
environment variables (e.g., as declared in a shell script)? I guess I'm
looking for something analogous to the System.Properties class, but for
environment symbols in the user's process space.

Thanks,

Michael

No, there once was support for that, but it has been removed (not all
platforms had environment variables).

Now, you can define extra properties usingh the -Dpropertyname=value syntax.

eg java MyClass -Dhttp.proxyHost=www.proxy.com

 

[Roedy Green]

Does J2SE provide a standard class or facility for obtaining the values of
environment variables (e.g., as declared in a shell script)? I guess I'm
looking for something analogous to the System.Properties class, but for
environment symbols in the user's process space.

see http://mindprod.com/jgloss/environment.html

 

[Chris Riesbeck]

see http://mindprod.com/jgloss/environment.html

With regard to that entry, if you care, the answer for how to set
environment variables on the Mac is to use JBindery pre Mac OS X
and use normal Unix export in Mac OS X.

Also, I'm curious why you put the Properties class third in the list
of how to access those variables. Shouldn't it come before non-portable
approaches like JNI?

 

[Roedy Green]

Also, I'm curious why you put the Properties class third in the list
of how to access those variables. Shouldn't it come before non-portable
approaches like JNI?

I don't like Properties because they use the Registry. See
http://mindpord.com/jgloss/registry. I have been forced into using
that approach with Java Web Start.

 

[Roedy Green]

With regard to that entry, if you care, the answer for how to set
environment variables on the Mac is to use JBindery pre Mac OS X
and use normal Unix export in Mac OS X.

the entry now reads:

For the Mac, I don't know how it works. I am told you use JBindery pre
Mac OS X and use normal Unix export in Mac OS X. Sorry I can give you
no more detail than that.