src/main/java/com/googlecode/objectify/ObjectifyFactory.java
public void close(final Objectify ofy) {
		final Deque<Objectify> stack = stacks.get();
		if (stack.isEmpty())
			throw new IllegalStateException("You have already destroyed the Objectify context.");

		final Objectify popped = stack.removeLast();
		assert popped == ofy : "Mismatched objectify instances; somehow the stack was corrupted";
	}
public void close(final Objectify ofy) {
		final Deque<Objectify> stack = stacks.get();
		if (stack.isEmpty())
			throw new IllegalStateException("You have already destroyed the Objectify context.");

		final Objectify popped = stack.removeLast();
		assert popped == ofy : "Mismatched objectify instances; somehow the stack was corrupted";
	}
Pops context off of stack after a transaction completes. For internal housekeeping only.