Hibernate SessionFactory, SessionFactory, Hibernate, Example, Code, Tutorial, Article

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Tags/Keywords : Hibernate SessionFactory, SessionFactory, Hibernate, Example, Code, Tutorial, Article
Author : Amit
Date (Year/Month/Date): 2009-02-18 How to create Hibernate SessionFactory a example discussed


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 Hibernate SessionFactory -
 the factory that provides
 Session for working with
 database within a single
 transaction. Session can
 be taken from SessionFactory
 and after use can be flushed
 and closed. but SessionFactory
 should be created only for
 once, and it can be configured
 to accept DataSource,
 Transaction attributes.

How to create Hibernate SessionFactory? What strategy best
suits to initialize SessionFactory?



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One way is to create SessionFactory from within a  Utility
class file that can be Singleton so that a single instace
of SessionFactory an made available for a ClassLoader in JVM.
But this way SessionFactory will be created on first
client call and this may result in a delay in first client
call being served. Or it could happen that due to some sort
of database failure, SessionFactory may not be initialized
properly and all client requests starts throwing exceptions.

Or one can have Java Servlet to be loaded on startup,
as can be defined in  deployment descriptor web.xml file.
This Servlet, in service method builds SessionFactory and
puts it in a Singleton Utility class file for use.
If in case this SessionFactory cannot be build, then this
Servlet may send required notificaton to concern
Administrator for action.

Or one can have this Hibernate SessionFactory created
inside a static initializer block of code inside some sort
of Utility Java class that can be used in program
code to retrieve SessionFactory.

While creation of SessionFactory, one can opt for binding
this Hibernate SessionFactory to be bound to JNDI, if the
application is running in application server with
initial context.

Once bound to JNDI, this SessionFactory can be looked up
by Service Locator and be served. This approach is suitable
if there is any need for creating SessionFactory
at one instance of application server and be reused across
all the instances of application server nodes/instances in
a cluster of application server.

Hibernate SessionFactory can be created as a JMX service,
by using JMX capabilities provided by application server.
This way it is all the more interesting to manage
SessionFactory remotely, like for example if SessionFactory
will have to be re-created, then this JMX service can be
re-started, without really re-starting the application.



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Hi Amit, Read your thought on Hibernate SessionFactory. So Hibernate SessionFactory can be created once per node or server instance, or it could be created once and bound to JNDI of any perticular node. Which approach is better, in your opinion?? If bound to one server noce and served by JNDI lookup, then there could possibility of single point of failure, in case the same node goes down. If Hibernate SessionFactory is created on all the instances or server nodes in a cluster, I think, then it could have better performance and more availability, in terms of Database connectivity/ interaction... What is your opinion?? Anybody else has any opinion to share here??? I Appreciate any answer to this question.

If Hibernate SessionFactory is being created by using Spring Framework, and with required configuration settings, then one may have to use appropriate factory bean from Spring Framework, with datasource/jdbc driver specific configuration and with some of those configuration setting as required(Please refer Spring Framework's documentations for details). Even there are some of those example/sample implementation explained in some of those pages from this website, as well.

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