Tomcat crashes when uploading files/data

[Shravan Shashikant]

Hi all,
  I am using O'Reilly's class to upload files in Servlets/Tomcat/Win
2000.Sometimes Tomcat crashes when uploading files.Is it possible to
prevent Tomcat from crashing.In the sense,since it is used for other
transacrions too,can we just generate an exception and stop Tomcat from
crashing.Is it a memory problem?If so,is it possible to increase Tomcat's
memory for that process.If any of u people out there have any ideas
regarding this problem I would like to hear it.
TIA,
Shravan