LogStash::ConfigurationError: com.mysql.jdbc.Driver not loaded

When I use the logstash_input_jdbc plugin sync MySQL and my local elastic search,

The below errors appear, But I search for a long time, but I have no resolve method until now.

./logstash -f ./logstash_jdbc_test/jdbc.conf Pipeline aborted due to error {:exception=>#, :backtrace=>["/usr/local/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-jdbc-3.0.2/lib/logstash/plugin_mixins/jdbc.rb:156:in prepare_jdbc_connection'", "/usr/local/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-jdbc-3.0.2/lib/logstash/inputs/jdbc.rb:167:in register'", "/usr/local/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.3.2-java/lib/logstash/pipeline.rb:330:in start_inputs'", "org/jruby/RubyArray.java:1613:ineach'", "/usr/local/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.3.2-java/lib/logstash/pipeline.rb:329:in start_inputs'", "/usr/local/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.3.2-java/lib/logstash/pipeline.rb:180:in start_workers'", "/usr/local/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.3.2-java/lib/logstash/pipeline.rb:136:in run'", "/usr/local/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.3.2-java/lib/logstash/agent.rb:465:in start_pipeline'"], :level=>:error}