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Guava 21 nie pójdzie już na Java7, Java8 jest nowym wymogiem
https://github.com/google/guava/wiki/Release21

Główne zmiany integracyjne z Javą:

Function, Predicate and Supplier: changed to extend the new java.util.function interfaces with the same names.
Optional: added toJavaUtil and fromJavaUtil methods for easy conversion between Guava's Optional and java.util.Optional.
Objects: removed deprecated firstNonNull and toStringHelper methods (both found on MoreObjects since Guava 18.0).

#interfacesmieci