Why does hibernate make an extra select query before insert?

Question

css

Hibernate: drop table java_class if exists
Hibernate: create table java_class (nameClass varchar(255) not null, class blob(255) not null, primary key (nameClass))
Jul 10, 2015 10:38:08 AM org.hibernate.tool .hbm2ddl.SchemaExport execute
INFO: HHH000230: Schema export complete
Hibernate: select javaclass0_.nameClass as nameClass0_0_, javaclass0_.class as class0_0_ from java_class javaclass0_ where javaclass0_.nameClass=?
Hibernate: insert into java_class (class, nameClass) values ​​(?, ?)
Hibernate: select javaclass0_.nameClass as nameClass0_0_, javaclass0_.class as class0_0_ from java_class javaclass0_ where javaclass0_.nameClass=?

Answer 1

move the modal window before the closing body tag somewhere on that level

Answer 2

probably, so that the bean to which the recording takes place is in the Persistence context.
more details in the book www.apress.com/9781430219569