If you mean "can I allow a remote user to access any file on the server I want using Tomcat/JBoss", no you can't. Tomcat is a WEB server, NOT a file server. Besides, that would be a horrible security issue if anyone who wanted to could access any server file at will.
However, if web applications running under Tomcat/JBoss need to access files in the filesystem of the server machine that they're running on, they can do so as long as the user that Tomcat's running under has appropriate file access rights. Just like any other application.
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Actually, that's what i want, he must be able to access and do anything he wants.
Is it possible to achieve this in tomcat?
Fortunately, no. If he could, so could any random hacker. And, as I said, a web server is not a file server.
If you want him to have file access to the server, you must install file server software on that machine (assuming there isn't already something installed), post out whatever network shares you need to publish, and setup file access rights for him. And, of course, open the firewall ports.
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