How to rebind a bean object programmatically in EJB 3.0

hi,
There is a bean object (EJB 3.0) which i want to rebind. How can I do it through another application running under same netweaver server.
For eg,
      one session bean object is bound to "java:comp/env/Converter" jndi name by one application. Here, i need to modify this object and rebind to the same jndi name. so i used as follows,
   context.rebind("java:comp/env/converter", beanobj );
   //'beanobj' is the modified bean (modified attribute's value)
it was bound successfully, but when i look up the bean object, i got the ClassCastException,
like "java.lang.ClassCastException : $Proxy5_1001 at ......"
can anybody help me?
regards,
Panneer.

@Vladimir Pavlov
I did not understand what you are trying to convey...
Whenever an attribute of this bean is modified we want to access that latest value.... Is there any way to know, when the attribute is modified? Just with get/set we can not know, when it is modified... am i right?
We want to achieve this without modifying the existing source code of the EJB....
@ Ivo Simeonov
As of my knowledge, to use interceptors we need to modify the EJB source code, but we do not want to touch the source code....
All this has to be achieved dynamically when the application is deployed in the production.... is it possible???

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