src/main/java/com/googlecode/objectify/ObjectifyFactory.java
public ObjectifyImpl open() {
		final ObjectifyImpl objectify = new ObjectifyImpl(this);
		stacks.get().add(objectify);
		return objectify;
	}
public ObjectifyImpl open() {
		final ObjectifyImpl objectify = new ObjectifyImpl(this);
		stacks.get().add(objectify);
		return objectify;
	}
<p>Start a scope of work. This is the outermost scope of work, typically created by the ObjectifyFilter
or by one of the methods on ObjectifyService. You need one of these to do anything at all.</p>