Re: [Dltk-dev] Calling Java from Ruby

[Andrew Mickish <mickish@xxxxxxx>]

Thanks, Alex.  It works with an augmented CLASSPATH in jruby.bat.

Is that where you modified CLASSPATH too?  I was hoping for a more 
elegant interface in an Eclipse dialog box...

--Andy


Alex Panchenko wrote:
> Hi Andrew,
>
> You should specify the CLASSPATH environment variable to the location 
> the java files could be loaded from.
> Most probably it should be C:\Workspace\ZooGlue\bin in your example.
>
> I have looked at http://jruby.codehaus.org/Java+Integration and made 
> some changes in your script, so not it works for me. Probably there 
> are other ways to do the same thing.
>
> include Java
> include_class 'zoo.utils.Truthiness'
>
> def show(it)
> puts it.to_s + ":\t" + Truthiness::isTrue(it).to_s + "\t" + 
> Truthiness::isFalse(it).to_s
> puts "\t" + (it ? "true":"false") + "\t" + ((!it)?"true":"false")
> end
>
> 0 ? "TRUE" : "FALSE"
>
> show( true )
> show( false )
> show( 0 )
> show( 1 )
> show( nil )
> show( "bye" )
> show( "" )
> show( 'x' )
>
> Regards,
> Alex
>
>
> Andrew Mickish wrote:
> > How can I call static Java methods located in a different project 
> > than my Ruby script?
> >
> > I have a Java project named ZooGlue containing the class 
> > zoo.util.Truthiness, and a Ruby project named Zuby containing the 
> > script TestTruthiness.rb starting with these lines:
> >
> >    include Java
> >    include_class Java::zoo.utils.Truthiness
> >
> > When I run TestTruthiness.rb, I get
> >    
> > C:/downloads/Ruby/jruby-1.1.4/lib/ruby/site_ruby/1.8/builtin/javasupport.rb:49: 
> >
> >    in `method_missing': cannot load Java class zoo.utils.Truthiness 
> > (NameError)
> >    from C:\Workspace\Zuby\TestTruthiness.rb:9
> >
> > I probably ought to put ZooGlue on Zuby's build path somehow, but the 
> > Build Path dialog box for the Ruby project does not list any of my 
> > Java projects as eligible to add to the build path.  Should I 
> > explicitly refer to  
> > C:\Workspace\ZooGlue\bin\zoo\utils\Truthiness.class in the Ruby 
> > script somehow?
> >
> > I am using Eclipse 3.4, DLTK 9.5, and my Ruby Interpreter executable 
> > is C:\downloads\Ruby\jruby-1.1.4\bin\jruby.bat
> >
> > ######################################################################
> > # Project: Zuby
> > # File: TestTruthiness.rb
> >
> > include Java
> > include_class Java::zoo.utils.Truthiness
> >
> > def show(it)
> >  println "" + it + ":\t" + isTrue(it) + "\t" + isFalse(it);
> >  println "\t" + (it ? "true":"false") + "\t" + ((!it)?"true":"false")
> > end
> >
> > 0 ? "TRUE" : "FALSE"
> >
> > show( true )
> > show( false )
> > show( 0 )
> > show( 1 )
> > show( null )
> > show( "bye" )
> > show( "" )
> > show( 'x' )
> >
> > ######################################################################
> >
> > //////////////////////////////////////////////////////////////////////
> > // Project: ZooGlue
> > // File: Truthiness.java
> >
> > package zoo.utils;
> >
> > /**
> > * Everything is true except false and null.
> > */
> > public class Truthiness {
> >      static public boolean isFalse (Object o)
> >    {
> >        return o == null || Boolean.FALSE.equals(o);
> >    }
> >
> >    static public boolean isTrue (Object o)
> >    {
> >        return isFalse(o) == false;
> >    }
> > }
> >
> > //////////////////////////////////////////////////////////////////////
> >
> >
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