configuring tomcat to use nio

[Elias Kopsiaftis]

My friend told me that my comet implementation wasnt working because i need
to configure tomcat to use nio rather than standard java io. what happens
is when i try to connect to the comet servlet from my client, im getting a
reponse that says get request is not supported even though im using a post
request. how do i configure this if this is the right solution?