The specification for field globalContext of class javax.scripting.SimpleScriptContext says: "By default, a SimpleBindings is used." But actually the value of this field is null.
The following code reproduces the problem:
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.SimpleScriptContext;

public class Test {
    public static void main(String[] args) {
        final ScriptContext context = new SimpleScriptContext();
        final Bindings globalScope = context.getBindings(ScriptContext.GLOBAL_SCOPE);
        System.out.println(globalScope);
    }
}

It prints "null".

Field engineScope has the same spec assertion, but it has value of type SimpleBindings.
###@###.### 2005-07-15 18:47:02 GMT