Use ServiceLoader to find Backend and Object Factory implementations

[mpkorstanje]

Summary

We currently use class path scanning to find backend and factory implementations. This is slow and makes setting up mock for tests a pain (they are also discovered). A ServiceLoader avoids this problem. This wasn't possible earlier versions of Cucumber because we compiled these against java 6.

https://docs.oracle.com/javase/7/docs/api/java/util/ServiceLoader.html

[aslakhellesoy]

Yes, this would be a great improvement!

[nhojpatrick]

Will look into this. Never used ServiceLoader before so also will improve my understanding of code java.
Just checking I should branch from develop-v5... when you say 5.0.0 milestone

[mpkorstanje]

Great! And yes, please use the v5 branch! You'll notice it has significant structural changes.

This will help move us towards automatic module names, expose less of cucumbers implementation details, ect.

[mpkorstanje]

Resolved by a03dd01.

[lock]

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