Opiniões: Connection Pool

public C3P0ConnectionHandler(String driver, String url, String user, String pass) {
        Class klass = null;
        try {
            klass = Class.forName("com.mchange.v2.c3p0.ComboPooledDataSource");
        } catch(ClassNotFoundException e) {
            throw new IllegalStateException("C3P0 cannot be found! You probably did not put the C3P0 jars in your /WEB-INF/lib directory!");
        }
        
        try {
            Class.forName(driver);
        } catch(ClassNotFoundException e) {
            throw new IllegalStateException("Cannot find jdbc driver " + driver + "! You probably did not put your JDBC driver in your /WEB-INF/lib directory!");
        }
        
        try {
            Object cpds = klass.newInstance();
            setValue(cpds, "driverClass", driver);
            setValue(cpds, "user", user);
            setValue(cpds, "password", pass);
            setValue(cpds, "jdbcUrl", url);
            this.cpds = (DataSource) cpds;            
            
        } catch(Exception e) {
            throw new RuntimeException("Error trying to setup a C3P0 pooled data source:" + e.getMessage());
        }
    }