is there a way to "link" a class file to a running java program so it can start using it?

<_tn> http://java.sun.com/docs/books/tutorial/reflect/index.html

thanks a lot!
You need to write a full OSGI implementation or people will laugh at you. Or maybe they will anyway.
i dont quite know what you mean

What you describe is a plugin system. Lots of people have come up with plugin systems and most of them suck.
OSGI is a specification for a plugin system.

Only Eclipse implements it, to my knowledge, and apparently, it doesn't suck (that doesn't stop Eclipse from sucking in general though).

I'm developping a small scale application in which i use javax.naming in order to authenticate users to MS Active Directory, currently -after authentication.

I'm adding the username to the session variable and using it as a means to check whether the session is still alive in every page, if it doesnt exist i'm forwarding the unlogged user to the login page. Would this be a proper way of doing it?

xterm: that's an acceptable way.. container security unfortunately never quite made it
MXV: Would you mind elaborating on that? What do you mean by Container securit never quite made it.
Would anyone happen to know of a well designed Recordset api in which i can incorporate in my solution?

My current backend is MySQL, i'm using MySQL implemented JDBC driver in order to connect to the database.
xterm: hm? container security (google for jaas and j_security_check) is ickypoo
MXV: Thank you sir. I believe i understand what you meant.