What SessionFactory does in Hibernate?

Most importantly, the SessionFactory in Hibernate is responsible for the creation of Session objects. The Hibernate Session provides methods such as save, delete and update, all of which are used to perform CRUD-based operations on the database to which the SessionFactory connects.

Is SessionFactory thread safe in Hibernate?

Once the object is immutable, its internal state is settled on creation and cannot be changed. So many threads can access it concurrently and request for sessions. hence the SessionFactory is thread-safe.

How do I get SessionFactory to Hibernate?

If you use Hibernate >= 4.3 and JPA >= 2.0 then you can accces the Session from the EntityManager through T EntityManagar#unwrap(Class cls) . From the Session you can obtain the SessionFactory .

What is difference between SessionFactory and session in Hibernate?

SessionFactory is a factory class for Session objects. It is available for the whole application while a Session is only available for particular transaction. Session is short-lived while SessionFactory objects are long-lived. SessionFactory provides a second level cache and Session provides a first level cache.

What is difference between EntityManagerFactory and SessionFactory?

Using EntityManagerFactory approach allows us to use callback method annotations like @PrePersist, @PostPersist,@PreUpdate with no extra configuration. Using similar callbacks while using SessionFactory will require extra efforts. Related Hibernate docs can be found here and here.

Why is SessionFactory immutable?

Advantages: Obviously its improving performance of your application 🙂 The internal state of a SessionFactory is immutable. Once it is created this internal state is set. This internal state includes all of the metadata about Object/Relational Mapping.

Can we have two SessionFactory in hibernate?

hibernate” package. Session factory is long live multithreaded object. Usually one session factory should be created for one database. When you have multiple databases in your application you should create multiple SessionFactory object.

What is difference between GET and load in hibernate?

Difference Between get() and load() in Hibernate In hibernate, get() and load() are two methods which is used to fetch data for the given identifier. Get() method return null, If no row is available in the session cache or the database for the given identifier whereas load() method throws object not found exception.

Which 2nd level cache is better in Hibernate?

Hibernate Second Level Cache

What is difference between GET and load in Hibernate?

Can we have two SessionFactory in Hibernate?

What is difference between JDBC and Hibernate?

JDBC enables developers to create queries and update data to a relational database using the Structured Query Language (SQL). JDBC is database dependent i.e. one needs to write different codes for different database. Whereas Hibernate is database independent and same code can work for many databases with minor changes.

How to create a singleton hibernate SessionFactory object?

In that utility class, we define a static factory method to a Hibernate SessionFactory object for one time and return the same factory object always. Since the utility class is only responsible for creating the singleton Hibernate SessionFactory object and returning that object, there is no need for creating an object for utility class.

Why is there no currentsessioncontext in hibernate?

Exception in thread “main” org.hibernate.HibernateException: No CurrentSessionContext configured! As the object of the session belongs to a hibernate context, we don’t have to close it. The session object gets closed, once the sessionFactory gets closed. Session objects of hibernate are never thread safe.

How to remove persistent instance in hibernate SessionFactory?

SessionFactory creator of this session is returned. With the given entity and identifier name, return of persistent instance is done and or or is nullified if no such instance of persistence is seen. Remove a persistent instance from the datastore.

Is it safe to use Session object in hibernate?

Session objects of hibernate are never thread safe. This is why we shouldn’t use it in a multi-threaded environment but can be used in a single-threaded environment. Also, it is relatively faster to open a new session. Return the associated Transaction object, by beginning the unit.