https://travis-ci.org/rails-api/active_model_serializers/jobs/296314721
```
Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m
jruby: warning: unknown property jruby.cext.enabled
2.7.0
32.06s$ bundle install --path=vendor/bundle --retry=3 --jobs=3
Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m
jruby: warning: unknown property jruby.cext.enabled
Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies.........................................................................................................................
Bundler could not find compatible versions for gem "actionpack":
In Gemfile:
actionpack (~> 4.0.0) java
rails (~> 4.0.0) java was resolved to 4.0.0, which depends on
actionpack (= 4.0.0) java
Bundler could not find compatible versions for gem "activemodel":
In Gemfile:
activemodel (~> 4.0.0) java
active_model_serializers java was resolved to 0.8.4, which depends on
activemodel (>= 3.0) java
rails (~> 4.0.0) java was resolved to 4.0.0, which depends on
activerecord (= 4.0.0) java was resolved to 4.0.0, which depends on
activemodel (= 4.0.0) java
Bundler could not find compatible versions for gem "activerecord":
In Gemfile:
activerecord (~> 4.0.0) java
rails (~> 4.0.0) java was resolved to 4.0.0, which depends on
activerecord (= 4.0.0) java
Bundler could not find compatible versions for gem "activesupport":
In Gemfile:
activesupport (~> 4.0.0) java
rails (~> 4.0.0) java was resolved to 4.0.0, which depends on
activesupport (= 4.0.0) java
Bundler could not find compatible versions for gem "rails":
In Gemfile:
rails (~> 4.0.0) java
Could not find gem 'rails (~> 4.0.0)' in any of the sources.
Bundler could not find compatible versions for gem "railties":
In Gemfile:
railties (~> 4.0.0) java
rails (~> 4.0.0) java was resolved to 4.0.0, which depends on
railties (= 4.0.0) java
Bundler could not find compatible versions for gem "tzinfo":
In Gemfile:
rails (~> 4.0.0) java was resolved to 4.0.0, which depends on
activesupport (= 4.0.0) java was resolved to 4.0.0, which depends on
tzinfo (~> 0.3.37) java
tzinfo-data java was resolved to 1.2017.3, which depends on
tzinfo (>= 1.0.0) java
The command "bundle install --path=vendor/bundle --retry=3 --jobs=3" failed and exited with 6 during .
Your build has been stopped.
```