How to memory management in vaadin

Hello Friends,
I am a new of vaadin framework since last three month i has been using the vaadin framework. then i am develop statistical report application project develop for our company now i almost develop the project and deployed test production server, but i got memory problem for out of memory error, how to rectified this cause if there any idea please let me know, now i am using tomcat web server using in my application.

thanks
karthik