Problem with constant defined in interface defined in class

Hi,

I have a problem with a constant defined in an interface which is 
defined in a class.

When the following program is run I get the output
"interface constant=null" instead of the expected out "interface 
constant=constant":

import bsh.EvalError;
import bsh.Interpreter;

public class BshInterfaceConstantTest
{
	public static void main(String[] args) throws EvalError
	{
		Interpreter interpreter = new Interpreter();
		interpreter.setStrictJava(true);
		
		String script =
			"class FooBar {"
			+"  interface Bla {"
			+"    String CONSTANT = \"constant\";"
			+"  }"
			+"  public void perform() {"
			+"    System.out.println(\"interface constant=\"+Bla.CONSTANT);"
			+"  }"
			+"}"

			+"new FooBar().perform();";
		
		interpreter.eval(script);
	}	
}

What is wrong with it?

Best regards
Hacim

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