serviceRegistration = bundleContext.registerService(IConnector.class.getName(), new Connector(), null);

serviceRegistration = bundleContext.registerService(Connector.class.getName(), new Connector(), null);

userDBConnectorTracker = new ServiceTracker(context, IConnector.class.getName(), this);

userDBConnectorTracker = new ServiceTracker(context, Connector.class.getName(), this);

public class HikariCPDataSource {

    private static HikariConfig config = new HikariConfig();
    private static HikariDataSource ds;

    static {
        config.setJdbcUrl("jdbc:h2:mem:test");
        config.setUsername("user");
        config.setPassword("password");
        config.addDataSourceProperty("cachePrepStmts", "true");
        config.addDataSourceProperty("prepStmtCacheSize", "250");
        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
        ds = new HikariDataSource(config);
    }

    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    private HikariCPDataSource(){}
}