@Configuration
@EnableTransactionManagement
@EnableCaching
public class SomeConfig {

    private static final Logger LOGGER = LoggerFactory.getLogger(SomeConfig.class);

    @Autowired
    private Environment env;

    @Bean
    @PostConstruct
    public void checkConnection() {
        try {
            HikariConfig config = new HikariConfig();
            config.setMaximumPoolSize(Integer.parseInt(env.getProperty("spring.datasource.hikari.maximum-pool-size")));
            config.setDriverClassName("org.postgresql.Driver");
            config.setJdbcUrl(env.getProperty("spring.datasource.url"));
            config.setUsername(env.getProperty("spring.datasource.username"));
            config.setPassword(env.getProperty("spring.datasource.password"));
            HikariDataSource hikariDataSource = new HikariDataSource(config);
            hikariDataSource.getConnection().getCatalog();
        } catch (Exception ex) {
            LOGGER.error("Не удалось подключиться к БД при старте");
            System.exit(1);
        }
    }
}