Need to migrate a swing application from JDK 1.4.2.11 to jdk 1.5

We have a swing application that works on JDK1.4.2.11 and Weblogic 8.1.5.

We have to migrate this application to Weblogic 9.2 and consequently JDK1.5.

I want to know if anyone has done this sort of this thing before and if yes get the details of the issues faced and the effort involved.

Also please provide me the list of API's deprecated in jdk1.5 from jdk1.4.2.11.

The current state of the application is such that if a user has installed  any jdk other than 1.4.2.11 then the application would not launch and throws an error.