The Java chips were for, well, they were for Java. If ARM had designed Jazelle to be more general, it would have been useful for Javascript and Python and ....

The Java chips were for, well, they were for Java. If ARM had designed Jazelle to be more general, it would have been useful for Javascript and Python and .... But they designed it for Java bytecode. The licensing was too expensive and so it didn't catch on and Jazelle got dropped from ARMv8.