Non-ASCII characters in script

I have a simple script (that adds two variables)

	String x;
	String é;
	String result;
	result = é + x;

that uses a non-ASCII character as a variable name. BSH parser does not parse correctly this variable.
In the code

	java.io.FileReader reader = new java.io.FileReader(myFileName);
	Parser parser = new Parser(reader);
	while (!parser.Line()) 
	{
		SimpleNode node = parser.popNode();
	...

I get 1, 3 and 4. row corectly parsed and for the 2. row a get BSHAmbiguousName.
Is there a setting I can use to tell BeanShell Parser that I want to work with UTF characters.

Thanks,
Mario