R help - Oct 2010 - R functions in Java

Suppose I have a function in R called foo.

foo = function(x)
{
   print(x);
}

When I create the Rengine re and do re.eval("foo(1)") I get the output
1.
However, if I create a string variable in java String num = 1 and do
re.eval("foo(num)"), I get an error saying that num cannot be found.
How can
I fix this problem.
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Any advice?
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For example, if I have the function in R:

sum = function(a,b)
{
  sum = a+b
 return sum
 } 

In Java:

re.eval(sum(a,b)) gives me an error. 
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