For what it's worth, you might consider putting together equivalent "Hello, world" apps in both the J2EE and Oracle frameworks. Then, you could start coming up with quantitative metrics about how long it would take you to finish the project. Another good quantitative number might be the amount of activity you can find on relevant chat boards (# of active users? posts per day?) where you might go asking for help or even the number of relevent books in the bookstore. Such "hard" numbers will lend more weight to anything qualitative you might have to say (such as commentary on the quality of 3rd party tools or your own personal preferences).