Thanks for all the replies! I really appreciate it!
I'll probably go with Flash after reading all of this, we are planning on making a simple platform type game, wich uses 2D graphics.
I also see that the common opinion is that Flash is good for simple projects (wich mine is ) and Java is more for the complex projects that include client/server communication and/or 3D graphics.
I thank you all for your time and help!
You all really helped me out with making a good decision!