Java Beans and EJB

[Sanjeev Shahi]

Hi! Everyone,
I've few questions.....
1. What is differnce between Java Beans and Enterprise Java Beans?
2. In EJB for instance if we have mentioned that in bean pool their can be only 20 beans and their is request for 21st bean by client then what will happen?
3. IN MVC can we used Java beans as a controller?
thanks
sk

[Ram Dhan Yadav K]

Hi Sanjeev,
1) This link might help you http://www.webgain.com/communities/developers/resources/articles/java_beans.html
2) It depends on type of bean you are talking about. What type of EJB are you talking about?
3) You can!

[Sanjeev Shahi]

thanks Ram Dhan for replying so quick
2. I am talking about entity bean
3. How Java Bean can be used as controller give little detail.
ss

[Ram Dhan Yadav K]

Hi Sanjeev,
2) they will be in que.
3) Actually you can play arround with java beans in what every manner you want. They just java classes with an getter and setter features. You can get excellent information about implementaion framework at http://jakarta.apache.org/struts/userGuide/index.html
This framework is recommended by SUN also.
good luck.

[Sanjeev Shahi]

Ram Dhan ,
what will be in case of Session Beans? In case of Stateful I think their is no pool so new instance will be created as their is need. What in case of Stateless ?
SS

[Ram Dhan Yadav K]

Hi Sanjeev,
Session beans are two types
1) Stateless
2) Stateful
Life of stateful bean in with the scope of serving one and only one client. When the cient needs it, get created/activated(id already created and passivated).
Stateless session beans are like classes with class level(static method), in reality they are not allowed to have static methods. They are can pooled in a EJB container and they can be used by any client and they are equal across clients. But one note, while a stateless session bean instance is serving a client, another client cannot access it. So while a stateful bean is serving a client its unique ro that client. Once the client is served immediately the bean instance is returned to the pool and its ready to serve the same client or different client.