I upgraded a quite old java app from java 6 and spring 3 to java 8 and spring 4.30 in 4 hours without changing a single line of code. I guess we both may have

I upgraded a quite old java app from java 6 and spring 3 to java 8 and spring 4.30 in 4 hours without changing a single line of code. I guess we both may have good anecdotal examples :)