Forum: JRuby Upper case global variable?

Is there a restriction when naming global variables to be shared between
java and jruby?

I'm using the jsr223 way and if I do

engine.put("Logger", logger), from jruby, $Logger is nil.
            -
          Begins with Upper case

If I use

engine.put("logger", logger), from jruby, $logger is not nil.

In reading the ruby documentation, it seems that global variables can
have uppercase names.

Budyanto Himawan wrote:
> Is there a restriction when naming global variables to be shared between
> java and jruby?
> 
> I'm using the jsr223 way and if I do
> 
> engine.put("Logger", logger), from jruby, $Logger is nil.
>             -
>           Begins with Upper case
> 
> If I use
> 
> engine.put("logger", logger), from jruby, $logger is not nil.
> 
> In reading the ruby documentation, it seems that global variables can
> have uppercase names.

I'm using jruby 1.4

On Fri, Mar 5, 2010 at 12:42 PM, Budyanto Himawan <lists@ruby-forum.com> 
wrote:
>
> engine.put("logger", logger), from jruby, $logger is not nil.
>
> In reading the ruby documentation, it seems that global variables can
> have uppercase names.

Would you please use JRuby 1.5.0.dev, whose snapshots are at
http://ci.jruby.org/snapshots/? There should not be any limitation for
global var names, but in JRuby 1.4.0, regex to judge Ruby variable
names wasn't correct. If you want to stay on JRuby 1.4.0, choosing
transient local variable behavior, see
http://kenai.com/projects/jruby/page/RedBridge#Local_Variable_Behavior_Options,
would work. In this case, global variables have a name start with "$"
even in Java, so you need to rewrite:

 engine.put("$Logger", logger);

-Yoko

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Thanks..yah the 1.5 seems to work better.