The language isn’t the problem. The runtime is the problem. It’s a dependency mess, a licensing lottery, and a tuning crapshoot. The overhead of simply making it work, and maintaining that status across heterogeneous environments, is more than non-Java shops want to undertake.

Having spent much of the first half of my career writing C and Perl and then Java, I was very happy to set aside the latter two - for completely differing reasons.