Set a field in my pojo session JAVA class with Spring

Question

Hi all,

• I have a session bean (scope session) class.
• I have a servlet filter "called" by external server, and extract some informations in the request. This class update an attribute value named 'TOTO' in the current client session.
• I have a service (@Service) called cyclically from my client side (Flex). This service read the attribute 'TOTO' in the current client session.

So, How to "protect" my attribute named 'TOTO' ? Which mecanism must be done ?

Thank you very much,

Regards

Anthony