Hibernate--could not initialize proxy-no session--lazy loading problem

Today, while learning hibernate, the following error occurred:

Error Analysis:

If we take a single object with the Get method there is no problem, but if the object we are fetching has an associated object, it is problematic with get, because it does not take the associated object out

Reference blog:

Do me a little harder!

Do me a little harder!

Lazy Loading principle:

Lazy-loaded objects are rewritten proxy objects, and when the associated session is not closed, access to the properties of these lazy-loaded objects (except GetID and GetClass) Hibernate initializes the agents . or use Hibernate.initialize (proxy) to initialize the proxy object, and when the associated session is closed, then access the lazy loaded object will appear an exception .

Hibernate--could not initialize proxy-no session--lazy loading problem