Spring Boot: Use database and application.properties for configuration

Question

I need to save the configuration of the Spring Boot application in the database.

Is it possible to store the database information in the application.properties

Answer 1

I unfortunately don't have a solution for this problem yet, but I use the following workaround for now (requires an additional application restart on configuration change).

@Component
public class ApplicationConfiguration {

    @Autowired
    private ConfigurationRepository configurationRepository;

    @Autowired
    private ResourceLoader resourceLoader;

    @PostConstruct
    protected void initialize() {
        updateConfiguration();
    }

    private void updateConfiguration() {
        Properties properties = new Properties();

        List configurations = configurationRepository.findAll();
        configurations.forEach((configuration) -> {
            properties.setProperty(configuration.getKey(), configuration.getValue());
        });

        Resource propertiesResource = resourceLoader.getResource("classpath:configuration.properties");
        try (OutputStream out = new BufferedOutputStream(new FileOutputStream(propertiesResource.getFile()))) {
            properties.store(out, null);
        } catch (IOException | ClassCastException | NullPointerException ex) {
            // Handle error
        }
    }

}

I load the configuration from the database and write it to an another property file. This file can be used with @PropertySource("classpath:configuration.properties").