Transaction can be applied to stateless session bean

Question

is transaction can be applied to stateless session beanif yes/no why?

Answer 1

Just because a stateless session bean is stateless doesn't mean it doens't hold state. The stateless means it shouldn't hold any client state.
It can hold onto for example the dao objects.
The idea is that you pass all the client state to the sessionbean when calling it.
Eg.
public void doBulkOperation( User user ,string param1, String param2){
operation1( user, param1 );
operation2( user, param2 );
public void operation1( User user ,String param1){
//do some work involving user
public void operation2( User user ,String param2){
//do some work involving user
now suppose that doBulkOperation, operation1, operation2 are declared as transaction required. doBulkOperation starts the transaction if there isn't one running and joins the transaction. Then operation1 and operation2 join in the transaction.
Perfectly safe!
What you're not allowed to do is the following:
privata User user
public void doBulkOperation( User user ,string param1, String param2){
this.user = user;
operation1( param1 );
operation2( param2 );
public void operation1( String param1){
//do some work involving user
public void operation2( String param2){
//do some work involving user
This would be unsafe because concurrent calls will change the user and produce unpredictable results and possibly corrupting data.
It will work perfectly thougn if there is only one user or you're using a statefull session bean providing you don't share that bean with several clients.