no such file to load -- thread_safe/jruby_cache_backend from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/thread_safe-0.3.4/lib/thread_safe/cache.rb:12:in `ThreadSafe' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/thread_safe-0.3.4/lib/thread_safe/cache.rb:3:in `(root)' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflector/inflections.rb:1:in `(root)' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflector/inflections.rb:28:in `Inflections' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflector/inflections.rb:27:in `Inflector' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflector/inflections.rb:6:in `ActiveSupport' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflector/inflections.rb:5:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflections.rb:1:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflections.rb:1:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflector/methods.rb:1:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/inflector/methods.rb:3:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/core_ext/string/inflections.rb:1:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/core_ext/string/inflections.rb:1:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/xml_mini.rb:1:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/xml_mini.rb:5:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/core_ext/array/conversions.rb:1:in `(root)' from org/jruby/RubyKernel.java:1065:in `require' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/core_ext/array/conversions.rb:1:in `(root)' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/core_ext/object/conversions.rb:1:in `(root)' from /opt/tomcat/apache-tomcat-6.0.18/webapps/blog/WEB-INF/gems/gems/activesupport-4.1.5/lib/active_support/core_ext/object/conversions.rb:3:in `(root)'