thread safty in EJB

[Samanthi perera]

I read that sessionbean and MDBs are thread safe in EJB.
so look example sessionbean below

package statfull;

import javax.ejb.Stateful;
import javax.ejb.Remote;
import javax.ejb.Remove;
import javax.ejb.*;


@Stateful(name="AccountBean")
@Remote(AccountBeanRemote.class)
public class AccountBeanBean implements AccountBeanRemote {

    float balance = 0;

    public float deposit(float amount) {
        balance += amount;
        return balance;
    }

    public float withdraw(float amount) {
        balance -= amount;
        return balance;
    }

    @Remove
    public void remove() {
        balance = 0;
    }
}

1)so that means all methods in this session bean are thread safe?

2)why isn't Entity beans thread safe?

[Jaikiran Pai]

Samanthi perera wrote:

1)so that means all methods in this session bean are thread safe?

Yes

Samanthi perera wrote:
2)why isn't Entity beans thread safe?

The example you posted is for EJB3. And EJB3 does not have any entity beans.

[Samanthi perera]

then how we get persistance in EJB 3 ?
are you kidding?

[Jaikiran Pai]

Samanthi perera wrote:then how we get persistance in EJB 3 ?

You use plain JPA (or vendor specific) entities. JPA based entities are not enterprise beans. They are just plain java objects.

Samanthi perera wrote:
are you kidding?

No, I am not.