this post was submitted on 28 Mar 2025
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Java can be pretty damn efficient for long running processes because it optimizes at runtime. It also can use new hardware features (like cpu instructions) without having to compile for specific platforms so in practice it gets a boost there. Honestly, the worst thing about Java is the weird corporate ecosystem that produces factoryfactory and other overengineered esoteric weirdness. It can also do FFI with anything that can bind via c ABI so if some part of the program needed some hand optimized code like something from BLAS it could be done that way.
All that to say it doesn't matter what language they use anyway, because rewriting from scratch with a short timeline is an insane thing to do that never works.
Why is there a need to rewrite it at all? Is it because COBOL is basically ancient hieroglyphics to modern programmers thus making it hard to maintain or update?
Refactoring a code base is kinda like general maintenance for the application. Over time deprecated features, temp fixes, etc. start to be a lot of the code base. By cleaning things up you can make it more maintainable, efficient, etc.
That being said, for systems this large you usually fix up parts of it and iterate over time. Trying to do the whole code base is hard cause it's like replacing the engine while the car is in motion.
refactor is one thing, rewrite everything in a new language is another thing.
Yet it's the thing every junior dev wants to do as they gain more experience.
Right after they write yet another content management system.
Oh yeah, definitely.