I agree with Casey, specially the deep roots part. Java, like COBOL, powers a massive amount of software and hardware nowadays. I'm not sure how popular it is for new applications, even more now that Kotlin is in the scene. But here at my job, there are several Java and COBOL applications maintaned and even new programs being created.
I think the "replace" part is due to the fact that startups haven't been using Java for some time now, Rails and the like have chewed the marked and continue to gain popularity.
On the other hand, qualified Java developers, from junior to senior, are a difficult professional to find around here (Brasil).
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