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I've said this myself as Java's reification of mid 90s OO and poor interop via JNI are not to my taste. But I've spent 25yrs in banking with JPMC, BoA, Barclays et al. Done lots of interop with Cobol on S/390, AS/400 and VME. Never heard of any of those systems being rewritten in Java. Have encountered key mainframe prod systems for which source is lost.

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I know of one investment bank (a former employer) that rewrote its mainframe-based settlement system in Java (on Linux). Front office systems were often Java (replacing Obj-C in some cases).

That was two decades ago – almost a generation! Interesting to think that some of those systems would now be considered “legacy”.

I'm guessing Swiss Bank/UBS as a mate used to trade there and had a NeXT workstation and loved Wingz. Later I heard they were doing server side pricing work on Apple servers. I stand corrected; thanks!

There are even whole companies specialized in semi-automatic migration of cobol to java.

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