R help - Jan 2007 - Using JRI Calling R function from Java

Hey guys.

I have Installed and running JRI from Java
and it works. Using : java -cp jri.jar; MainApp.java

The problem is How do I calling R function that need R library 
I have tried these with my Java program : 
               x =  re.eval("glm( y ~ x1 + x2, family = poisson)");
               String resultString = x.asString();
but it did'n't work, resultString variable did't give any result
it's null

questions : 
Is there any other way to call this R function from Java using JRI?

and  I have heard omegahat package can be use to calling R function
are there any links, examples , tutorials for using omegahat?

Thanks 
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