I have come accross this code in one of article.

results = HibernateUtils.find(query,
new Object[] {name + "%"},
new Type [] {Hibernate.STRING});


My question is what is HibernateUtils? I do not find in Hibernate API?

HibernateUtils is not part of the Hibernate api, and it should be provided by your article. It's likely just class that provide Hibernate setup and utility methods like you've just seen.

If you want to understand how Hibernate find object or execute query, read their ref manual, and their api doc. (see org.hibernate.Session)