src/main/java/com/googlecode/objectify/impl/QueryImpl.java
void addProjection(final String... fields) {
		if (this.hybrid != null && this.hybrid)
			throw new IllegalStateException("You cannot ask for both hybrid and projections in the same query. That makes no sense!");

		for (final String field: fields) {
			this.actual = this.actual.project(field);
		}
	}
void addProjection(final String... fields) {
		if (this.hybrid != null && this.hybrid)
			throw new IllegalStateException("You cannot ask for both hybrid and projections in the same query. That makes no sense!");

		for (final String field: fields) {
			this.actual = this.actual.project(field);
		}
	}
Modifies the instance