Fix JRuby build on CI, with a suggestion from Travis CI support

[bf4]

per
hanami/helpers@13f30e2
per https://twitter.com/jodosha/status/823522145745731586

and ref rails/rails#23453

Failures:

• https://travis-ci.org/rails-api/active_model_serializers/jobs/194809110
• https://ci.appveyor.com/project/bf4/active-model-serializers/build/782/job/y4upmix6325a865x

Bundler could not find compatible versions for gem "json":
In snapshot (Gemfile.lock):
json (= 1.8.6) java
In Gemfile:
simplecov (> 0.11) java was resolved to 0.12.0, which depends on
json (< 3, >= 1.8) java
simplecov (> 0.11) java was resolved to 0.12.0, which depends on
json (< 3, >= 1.8)

• https://ci.appveyor.com/project/bf4/active-model-serializers/build/782/job/14mq0r5t0dfr7f1c

C:/Ruby21/lib/ruby/gems/2.1.0/gems/bundler-1.14.2/lib/bundler/resolver.rb:207:in rescue in start': Bundler could not find compatible versions for gem "nokogiri": (Bundler::VersionConflict) In snapshot (Gemfile.lock): nokogiri (= 1.7.0.1) x86-mingw32 In Gemfile: active_model_serializers x86-mingw32 was resolved to 0.10.4, which depends on actionpack (< 6, >= 4.1) x86-mingw32 was resolved to 4.2.7.1, which depends on rails-dom-testing (>= 1.0.5, ~> 1.0) was resolved to 1.0.8, which depends on nokogiri (~> 1.6) x86-mingw32 active_model_serializers x86-mingw32 was resolved to 0.10.4, which depends on actionpack (< 6, >= 4.1) x86-mingw32 was resolved to 4.2.7.1, which depends on rails-dom-testing (>= 1.0.5, ~> 1.0) was resolved to 1.0.8, which depends on nokogiri (~> 1.6) Running bundle update` will rebuild your snapshot from scratch, using only

[mention-bot]

@bf4, thanks for your PR! By analyzing the history of the files in this pull request, we identified @steveklabnik, @nadavshatz and @joshk to be potential reviewers.

[nadavshatz]

Great stuff, maybe worth updating/adding the JRuby version?

[bf4]

All the JRuby failures on windows are of type:

NoMethodError: undefined method `demodulize' for nil:NilClass
    C:/projects/active-model-serializers/lib/active_model_serializers/lookup_chain.rb:68:in `resource_class_name'
    C:/projects/active-model-serializers/lib/active_model_serializers/lookup_chain.rb:27:in `block in LookupChain'
    org/jruby/RubyProc.java:308:in `call'
    C:/projects/active-model-serializers/lib/active_model/serializer.rb:65:in `block in serializer_lookup_chain_for'
    org/jruby/RubyArray.java:1560:in `each'
    org/jruby/RubyEnumerable.java:836:in `flat_map'
    C:/projects/active-model-serializers/lib/active_model/serializer.rb:64:in `serializer_lookup_chain_for'
    C:/projects/active-model-serializers/lib/active_model/serializer.rb:87:in `block in get_serializer_for'
    C:/projects/active-model-serializers/vendor/bundle/jruby/2.2.0/gems/thread_safe-0.3.5-java/lib/thread_safe/cache.rb:68:in `block in fetch_or_store

[bf4]

@nadavshatz do you have a recommendation?

[nadavshatz]

@bf4 we are currently using 9.1.6.0. I think it would make sense to test against the latest stable or at least 9.0.*.* and 9.1.*.*.
If it's too much I would prefer 9.1.*.* as the latest minor level.

What do you think?

[bf4]

@nadavshatz pushed a commit.

[nadavshatz]

@bf4 looks good to me !