Calling jbdc-mysql inside puppetserver jruby

Hello,

In a erb file, we were using the Mysql DBI driver. It works great within a puppetmaster environment. But I can't get this erb file working inside puppetserver.

After reading link native-c-extension, I've switched to jdbc/mysql. But I can't get it working.

Here a simple code that didn't run inside a puppserver

require 'dbi'
require 'dbd/Jdbc'
require 'jdbc/mysql'
Jdbc::MySQL.load_driver
DBI.connect('dbi:jdbc:mysql://localhost/test', 'username', 'password', 'driver' => 'com.mysql.jdbc.Driver') do |dbh|
puts "Connected"
end

It gives:

Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Evaluation Error: Error while evaluating a Function Call, Failed to parse template test.erb:
Filepath: /opt/puppetlabs/server/data/puppetserver/jruby-gems/gems/dbd-jdbc-0.1.6-java/lib/dbd/jdbc/driver.rb
Line: 66
Detail: java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test
at /etc/puppetlabs/code/environments/ohanesse/modules/test/manifests/ohanesse.pp:7:16 on node test-*
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run

I've tried to add the 'mysql-connector-java-5.1.36-bin" jar file to the classpath (using -cp in the command line), same error.

Any ideas ?