我第一次尝试在基于 JRuby 的项目中设置 Rails 可安装引擎（必要）。
引擎是空的，只有一个“hello world”测试控制器+视图，没有任何模型，没有使用 JSON。我尝试运行“捆绑安装”，它顺利通过，没有任何错误。
当我使用 'rake engine_name:install:migrations' 运行测试应用程序的初始数据库迁移时，它会引发错误：
rake aborted!
Could not find json-1.7.7 in any of the sources
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler/spec_set.rb:90:in `block in materialize'
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler/spec_set.rb:83:in `map!'
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler/spec_set.rb:83:in `materialize'
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler/definition.rb:113:in `specs'
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler/definition.rb:158:in `specs_for'
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler/definition.rb:147:in `requested_specs'
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler/environment.rb:23:in `requested_specs'
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:11:in `setup'
/home/user/.rvm/gems/jruby-1.7.2@global/gems/bundler-1.2.3/lib/bundler.rb:116:in `setup'
这是默认的 Gemfile.lock：
PATH
remote: .
specs:
project_name (0.0.1)
rails (~> 3.2.6)
GEM
remote: http://rubygems.org/
specs:
actionmailer (3.2.12)
actionpack (= 3.2.12)
mail (~> 2.4.4)
actionpack (3.2.12)
activemodel (= 3.2.12)
activesupport (= 3.2.12)
builder (~> 3.0.0)
erubis (~> 2.7.0)
journey (~> 1.0.4)
rack (~> 1.4.5)
rack-cache (~> 1.2)
rack-test (~> 0.6.1)
sprockets (~> 2.2.1)
activemodel (3.2.12)
activesupport (= 3.2.12)
builder (~> 3.0.0)
activerecord (3.2.12)
activemodel (= 3.2.12)
activesupport (= 3.2.12)
arel (~> 3.0.2)
tzinfo (~> 0.3.29)
activerecord-jdbc-adapter (1.2.7)
activerecord-jdbcmysql-adapter (1.2.7)
activerecord-jdbc-adapter (~> 1.2.7)
jdbc-mysql (~> 5.1.0)
activeresource (3.2.12)
activemodel (= 3.2.12)
activesupport (= 3.2.12)
activesupport (3.2.12)
i18n (~> 0.6)
multi_json (~> 1.0)
arel (3.0.2)
builder (3.0.4)
erubis (2.7.0)
hike (1.2.1)
i18n (0.6.1)
jdbc-mysql (5.1.22.1)
journey (1.0.4)
jquery-rails (2.2.1)
railties (>= 3.0, < 5.0)
thor (>= 0.14, < 2.0)
json (1.7.7)
json (1.7.7-java)
mail (2.4.4)
i18n (>= 0.4.0)
mime-types (~> 1.16)
treetop (~> 1.4.8)
mime-types (1.21)
multi_json (1.6.1)
polyglot (0.3.3)
rack (1.4.5)
rack-cache (1.2)
rack (>= 0.4)
rack-ssl (1.3.3)
rack
rack-test (0.6.2)
rack (>= 1.0)
rails (3.2.12)
actionmailer (= 3.2.12)
actionpack (= 3.2.12)
activerecord (= 3.2.12)
activeresource (= 3.2.12)
activesupport (= 3.2.12)
bundler (~> 1.0)
railties (= 3.2.12)
railties (3.2.12)
actionpack (= 3.2.12)
activesupport (= 3.2.12)
rack-ssl (~> 1.3.2)
rake (>= 0.8.7)
rdoc (~> 3.4)
thor (>= 0.14.6, < 2.0)
rake (10.0.3)
rdoc (3.12.1)
json (~> 1.4)
sprockets (2.2.2)
hike (~> 1.2)
multi_json (~> 1.0)
rack (~> 1.0)
tilt (~> 1.1, != 1.3.0)
thor (0.17.0)
tilt (1.3.3)
treetop (1.4.12)
polyglot
polyglot (>= 0.3.1)
tzinfo (0.3.35)
PLATFORMS
java
ruby
DEPENDENCIES
activerecord-jdbcmysql-adapter
engine_name!
jquery-rails
Here is default Gemfile:
source "http://rubygems.org"
gemspec
gem "jquery-rails"
当我在 Ruby（而不是 JRuby）上进行相同的运行时，一切正常，没有任何问题。
你对这个主题没有任何想法或经验吗？
谢谢！:)