Optional Parameter in MVEL Functions

private void method(Object obj1) {
    Object obj2 = new Object("Default");
    method(obj1, obj2);
}

private void method(Object obj1, Object obj2) {
    doStuff(...);
}

parserContext = new ParserContext();
parserContext.addImport("color", MyImplementation.class.getMethod("color", double[].class));

// This one is used for lookup, but never called.
public static Color color(double... values) {}

public static Color color(double gray) {}
public static Color color(double red, double green, double blue) {}