R help - Oct 2010 - Evaluating R functions in Java with dynamic input

So I have an R function:
function = foo(x)
{
return(x)
}
In java:

I create an Rengine:
  Rengine re = new Rengine(args,false,new TextConsole()); 
  int blah = 5
  re.eval("foo(blah)");

I get an error(object blah not found). How do I dynamically evaluate my
functions given user input(without hard coding it)? It works when I do
re.eval("foo(blah)") .
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