Item 21: How to Use Direct Fetching
Direct fetching or fetching by ID is the preferable way to fetch an entity when its identifier is known and its lazy associations will not be navigated in the current Persistence Context.
By default, direct fetching will load the entity according to the default or specified FetchType. It’s important to keep in mind that, by default, the JPA @OneToMany and @ManyToMany associations are considered LAZY, while the @OneToOne and @ManyToOne associations are considered EAGER.
So, fetching an entity by ID that has an EAGER association will load that association ...
