connectionPool com mysql

Tentei fazer um pool de conexões com o driver mysql e tive o seguinte erro.

 public static void main(String args[]) throws Exception {
        ComboPooledDataSource connectionPoolDatasource = new ComboPooledDataSource();
        connectionPoolDatasource.setDriverClass("com.mysql.jdbc.Driver");
        connectionPoolDatasource.setJdbcUrl("jdbc:mysql://localhost:3306/loja-virtual");
        connectionPoolDatasource.setUser("root");
        connectionPoolDatasource.setPassword("8508");
        connectionPoolDatasource.setMinPoolSize(1);
        connectionPoolDatasource.setAcquireIncrement(5);
        connectionPoolDatasource.setMaxPoolSize(20);
        Connection con = connectionPoolDatasource.getConnection();

    }

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/pool2/PooledObjectFactory
    at br.com.alura.jdbc.Databaseteste2.main(Databaseteste2.java:12)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.pool2.PooledObjectFactory
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 1 more