Actually my stack trace is a bit different, but the main exception remains LinkageError:
/app/mediacast/mediacast/config/../vendor/rails/railties/lib/initializer.rb:259:in `require_frameworks': library `socket' could not be loaded: java.lang.LinkageError: org/jruby/ext/socket/RubySocket (RuntimeError)
from /app/mediacast/mediacast/config/../vendor/rails/railties/lib/initializer.rb:133:in `process'
from /app/mediacast/mediacast/config/../vendor/rails/railties/lib/initializer.rb:112:in `run'
from /app/mediacast/mediacast/config/environment.rb:22
from /app/mediacast/mediacast/config/environment.rb:31:in `require'
from /app/mediacast/jruby-1.3.1/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
from file:/app/mediacast/glassfishv3/glassfish/modules/grizzly-jruby.jar!/rack/adapter/rails.rb:98:in `load_application'
from file:/app/mediacast/glassfishv3/glassfish/modules/grizzly-jruby.jar!/rack/adapter/rails.rb:75:in `initialize'
from file:/app/mediacast/glassfishv3/glassfish/modules/grizzly-jruby.jar!/jruby/rack/rails.rb:25:in `new'
from <script>:1
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