The best and most widely used libraries and interfaces for a given problem always seem to be C++ or C. I think it differs hugely per case. E.g. there are not g

The best and most widely used libraries and interfaces for a given problem always seem to be C++ or C. I think it differs hugely per case. E.g. there are not great C++ or C libraries that provide functionality of Akka, Guava, or Java persistence. On the other hand, nothing in Java-land beats Qt, Cocoa, or Eigen. But I agree on interoperability. Interoperability within JVM-land is pretty great. But it is far easier to write a good binding for a C library in e.g. Python, Ruby, Go, or Haskell, than it is in JNI.