Sharing values in session between .jsp pages in OC4J

I am developing a web server with multiple .jsp pa开发者_StackOverflow中文版ges. OC4J (10.1.3.1) is being used. But I found that Parameters, that are saved in session in a .jsp page, cannot be retrieved in another .jsp page

Is there any hint ? FYI, OC4J is not customized by any means ...

Objects stored in an HttpSession instance must implement the java.io.Serializable interface in order to be deployed with the <distributable /> flag in web.xml.

Read the article Configuring the OC4J Instance. I think it could be helpful...