Yeah, I know there are even oddballs using it for HFT and the like - I like Java a lot, but even I find that a bit peculiar.
Edit: actually, if someone here is using it for something like that I'd love to hear the rationale...?
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I've worked adjacent to that space (high performance fin-tech java), enough that I feel qualified to answer.
It's mostly a trade-off. Java's tooling, reliability and ecosystem is some of the best around. Even though building high performance software in Java is a bit of a pain, looking at the bigger picture, it's often still worth it.
Not „oddballs“ for sure. Java established itself as the primary enterprise language for fintech in 2000s and since then there was and there is no reason to switch. It offers everything business needs including vast supply of workforce.