Consider the following:

package test16;
public class MyBean {
	private String foo;
	private String bar;
	public String getFoo() {
		return foo;
	}
	public String getBar() {
		return bar;
	}
}

And the following Groovy class:

package test16
class Test16 {
  void doSomething() {
	  def bean1 = new MyBean()
	  def bean2 = new MyBean(foo: bea|)
  }
}

Invoke code assist at "|", with the purpose of writing bean1.foo: as you can see, no proposal is shown, apart from generic proposals for class names.