Driver.java

import javax.script.*;
import java.io.*;

public class Driver
{
  public static void main(String[] args) throws ScriptException, FileNotFoundException, NoSuchMethodException {
    // Setup stuff....
    // Get the ScriptEngineManager
    ScriptEngineManager manager = new ScriptEngineManager();
    // Get the JRuby engine
    ScriptEngine engine = manager.getEngineByName("jruby");
    // Cast the engine to an Invocable
    Invocable invocable = (Invocable) engine;
    
    // Get the filename containing our ruby script
    String rubyFileName = System.getProperty("user.dir") + "/ruby_script.rb";
    // Read in the file
    FileReader reader = new FileReader(rubyFileName);
    
    // Evaluate the ruby script
    engine.eval(reader);
  }
}

ruby_script.rb

require 'rubygems'
gem 'sequel', '>=2.12.0', '<=3.9.0'
require 'sequel'

# Set up DB connection
DB_FILE_NAME = File.expand_path('./SQL.db')
DB = Sequel.connect("jdbc:sqlite:#{DB_FILE_NAME}")

# Simple connectivity test
DB.create_table! :tests do
  primary_key :id
end

if DB.table_exists?(:tests)
  puts "Finished successfully!"
else
  puts "Failed :(" # Doesn't really get here... crashes at line 10
end

run.sh

#!/bin/bash

javac Driver.java

echo Trying jruby-1.4.0 complete jar
java -cp .:jruby-complete-1.4.0.jar:sqlitejdbc-v056.jar Driver

# => Finished successfully!

echo Trying jruby-1.5.0 complete jar
java -cp .:jruby-complete-1.5.0.jar:sqlitejdbc-v056.jar Driver

# => java/sql/DriverManager.java:602:in `getConnection': NativeException: java.sql.SQLException: No suitable driver found for jdbc:sqlite:/Users/sam/jruby_sqlite_example/SQL.db (Sequel::DatabaseConnectionError)
    # from java/sql/DriverManager.java:207:in `getConnection'
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/adapters/jdbc.rb:143:in `connect'
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/database.rb:86:in `initialize'
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/connection_pool.rb:87:in `call'
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/connection_pool.rb:87:in `make_new'
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/connection_pool/threaded.rb:126:in `make_new'
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/connection_pool/threaded.rb:112:in `available'
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/connection_pool/threaded.rb:102:in `acquire'
    #  ... 8 levels...
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/database/schema_methods.rb:73:in `create_table'
    # from /Users/sam/.rvm/gems/ruby-1.9.1-p378/gems/sequel-3.9.0/lib/sequel/database/schema_methods.rb:80:in `create_table!'
    # from <script>:10