Hibernate: create global temporary table HTE_book(rn_ integer not null, id bigint, version bigint, author varchar(255), title varchar(255), primary key (rn_)) transactional Hibernate: create global temporary table HTE_widget_sequence(rn_ integer not null, id bigint, name varchar(255), primary key (rn_)) transactional Hibernate: create table book (id bigint not null, author varchar(255), title varchar(255), version bigint not null, primary key (id)) Hibernate: create table widget_identity (id bigint generated by default as identity, name varchar(255), primary key (id)) Hibernate: create table widget_sequence (id bigint not null, name varchar(255), primary key (id)) Hibernate: create sequence book_seq start with 1 increment by 50 Hibernate: create sequence widget_seq start with 1 increment by 25 Hibernate: select next value for book_seq Hibernate: /* insert for com.ankurm.hibernatedemo.model.Book */insert into book (author,title,version,id) values (?,?,?,?) binding parameter (1:VARCHAR) <- [Joshua Bloch] binding parameter (2:VARCHAR) <- [Effective Java] binding parameter (3:BIGINT) <- [0] binding parameter (4:BIGINT) <- [1] SEED: inserted Book id=1 --- Step 1: session.get() on an existing id --- about to call session.get(Book.class, 1) Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=? binding parameter (1:BIGINT) <- [1] get() returned: Book{id=1, title=Effective Java, author=Joshua Bloch, version=0} --- Step 2: session.get() on a missing id --- about to call session.get(Book.class, 999001) Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=? binding parameter (1:BIGINT) <- [999001] get() returned: null (no exception thrown) --- Step 3: session.getReference() on an existing id --- getReference() returned proxy of class com.ankurm.hibernatedemo.model.Book$HibernateProxy -- no SELECT above this line now calling proxy.getTitle() ... Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=? binding parameter (1:BIGINT) <- [1] getTitle() returned 'Effective Java' -- the SELECT for this ran just above this line --- Step 4: session.getReference() on a missing id --- getReference() returned a proxy for a row that does not exist -- no exception yet: com.ankurm.hibernatedemo.model.Book$HibernateProxy Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=? binding parameter (1:BIGINT) <- [999001] accessing the proxy threw jakarta.persistence.EntityNotFoundException: No row with the given identifier exists for entity [com.ankurm.hibernatedemo.model.Book with id '999001'] --- Step 5: proxy accessed after its session is closed --- session closed. proxy in hand: com.ankurm.hibernatedemo.model.Book$HibernateProxy accessing the proxy after close threw org.hibernate.LazyInitializationException: Could not initialize proxy [com.ankurm.hibernatedemo.model.Book#1] - no session --- Step 6: proxy identity vs a real loaded instance --- Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=? binding parameter (1:BIGINT) <- [1] real.getClass() = com.ankurm.hibernatedemo.model.Book proxy.getClass() = com.ankurm.hibernatedemo.model.Book$HibernateProxy proxy instanceof Book.class: true real.getClass() == proxy.getClass(): false real.equals(proxy) before proxy access: false