How can i get session object based on session id?

I have tried searching in forum but i can't find any solution that i can get session object based on session id and i also would like to know how to check whether the session is still active? My company currently using weblogic 5.1. I really hope that some one or anyone can help. I am new in using Servlet. I hope that i can find some answer here. Thank you.

I have a need to get a Session object from a session id, so I don't think that the above should be deprecated. Here is my use case:
0. I am displaying files in a file list
1. I am downloading files.
2. I am downloading files through a Servlet
3. I am displaying the files as images in an applet
4. The applet is ImageJ, and it apparently uses a full URL to download the file.
5. I use request.getRequestURL() in the applet .jsp to get the full URL (the hostname and port)
6. My app server is OC4J and it's behind an apache server and is host aliased.
7. Thus the hostname is different between my applet .jsp and the Servlet URLs
8. Thus I have 2 different sessions
9. Thus I need to pass the session id (or some other unique identifier).
10. I could stored the unique identifier in the application object, but then I would need to clean it up
11. I cannot pass the the full path to the image due to security problems (what if someone downloads my password file?)
12. I would like this to work in a clustered environment
13. I think that WebDAV would solve my problems, since I could pass a full URL of webDAV to ImageJ for download. However, I am unsure how the security of WebDAV would work with ImageJ/URLConnection. I will have to research this feature in ImageJ.

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