actually i am trying deploy the application in tomcat 6.0.29.these applications are running in weblogic 8.1,10.2.so what are the changes we want to do from devolper side.
You may need to to a total redesign and rewrite. WebLogic is a full-spec J2EE implementation and it includes support for things like EJBs. Tomcat only provides a limited set of J2EE functions: servlets and JSPs.
As long as the webapps didn't use any of the J2EE features not supported by Tomcat, they should be able to run more or less unchanged. On the other hand, if they do invoke services not supplied by Tomcat, you're either going to have to do a major change or find some compatible third-party subsystem(s) to add to your webapp that supply the missing functionalities.
An IDE is no substitute for an Intelligent Developer.