How can I pass an object from an applet to a servlet ?

Look at this article, they explain exactly how to solve your problem through Object Serialization.

http://www.j-nine.com/pubs/applet2servlet/Applet2Servlet.html

Have fun.

See also:

• How can my applet communicate with my servlet?
• When you communicate with a servlet from an Applet, how can you ensure that the session information is preserved? That is, how do you manage cookies in applet-servlet communication?