Head First EJB

Bean things you can do during creation

(stateful session bean)

constructor	setSessionContext()		ejbCreate()
nothing Note It’s too early to DO anything! You’re an object, but not yet a bean.	Use your SessionContext to:		Use your SessionContext to:
		get a reference to your home		get a reference to your home
		get a reference to your EJB object		get a reference to your EJB object
		get security information about the client		get security information about the client
		force a transaction to rollback (CMT beans)		force a transaction to rollback (CMT beans)
		find out if the transaction has already been set to rollback (CMT beans)		find out if the transaction has already been set to rollback (CMT beans)
		get a transaction reference, and call methods on it (BMT beans)		get a transaction reference, and call methods on it (BMT beans)
	Access:		Access:
		your special JNDI environment		your special JNDI environment
		another bean’s methods		another bean’s methods
		a resource manager (like a database)		a resource manager (like a database)

Note: the word “access” means “do things with”, so when the spec uses the phrase “resource manager access”, it means using the resource to do whatever that resource is for. So in setSessionContext(), for example, you can use JNDI to look up a resource manager connection factory, like javax.sql.DataSource, and you can ask the DataSource for a connection (myDataSource.getConnection()), but you can’t make a JDBC call on the connection reference. You can use your connection in ejbCreate().

an aspiring Bean Provider

the more experienced Bean Provider