I am not able to start Tomcat v6.0 from Eclipse Helios.
I have my Java bin path set properly.
Moreover, I can start the server from outside of Eclipse manua
Seems that you're building some web-app with spring support.
You have to export dependencies into tomcat.
project_properties -> Java build path -> Order and Export tab.
On this tab check all checkboxes which are relevant (you have to check spring at least). Push OK. Redeploy