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90% of Java 1 code works on Java 8.

There are still enterprise apps stuck on Java 4, 5 and 6.

More importantly, bytecode produced by old Java compilers still runs on new VMs.

I believe that if Python 3 had been able to call into Python 2 modules (even by embedding CPython2) adoption would've been better.

I think byte code compatibility is gone now, its supports the current and previous versions only.

I worked on one such app that went to production a month ago. Java 6. :'(