NSA to release their're are decompiler as FOSS

https://www.zdnet.com/article/nsa-to-release-a-free-reverse-engineering-tool/

make your're are decompiler c*dder

People go to great lengths to exploit even Minecraft glitches, like using sophisticated tools for speedrunning that game in a minute:
https://www.youtube.com/watch?v=85fWuo36sU0

Now imagine if that isn't Minecraft, but a banking app, which are also written in Java today. If your program can be hacked, it will be hacked.