import javax.script.*;

public class t {
        public static void main(String[] args) throws Exception {
                ScriptEngineManager m = new ScriptEngineManager();
                ScriptEngine e = m.getEngineByName("js");
                e.eval("var v = 'hello'");
                Bindings b = e.createBindings();
                // b is newly created scope. We don't expect 'v' in it...
                // we expect 'b' to be empty
                for (String s: b.keySet())
                    System.out.println(s);
        }
}

Running the above program prints

context
print
v

This is not expected. The newly created scope somehow gets the values created in default engine scope of the JavaScript engine. This should not happen.