Cannot load jdbc driver class com mysql jdbc driver

home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:101:in `connection' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:102:in `connection' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:239:in `checkout' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `checkout' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:247:in `checkout'

home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:325:in `checkout_new_connection' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `new_connection' Org/jruby/RubyBasicObject.java:1665:in `_send_' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.2.5/lib/arjdbc/jdbc/connection_methods.rb:6:in `jdbc_connection' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.2.5/lib/arjdbc/jdbc/adapter.rb:31:in `initialize' home/ubuntu/.rbenv/versions/jruby-1.7.2/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.2.5/lib/arjdbc/jdbc/connection.rb:88:in `initialize' The driver encountered an unknown error: cannot load Java class ** Invoke db:schema:load_if_ruby (first_time)

Cannot load jdbc driver class com mysql jdbc driver