Spring Environment backed by Typesafe Config

Question

I want to use typesafe config (HOCON config files) in my project, which facilitate easy and organized application configuration. Currently I am using normal Java properties

Answer 1

You create a PropertySource class as follows, it is similar to yours with the difference that you have to return the value or null and not let the lib throw a missing exception

public class TypesafeConfigPropertySource extends PropertySource {

    private static final Logger LOG = getLogger(TypesafeConfigPropertySource.class);

    public TypesafeConfigPropertySource(String name, Config source) {
        super(name, source);
    }

    @Override
    public Object getProperty(String name) {
        try {
            return source.getAnyRef(name);
        } catch (ConfigException.Missing missing) {
            LOG.trace("Property requested [{}] is not set", name);
            return null;
        }
    }
}

Second step is to define a bean as follows

    @Bean
    public TypesafeConfigPropertySource provideTypesafeConfigPropertySource(
        ConfigurableEnvironment env) {

        Config conf = ConfigFactory.load().resolve();
        TypesafeConfigPropertySource source = 
                          new TypesafeConfigPropertySource("typeSafe", conf);
        MutablePropertySources sources = env.getPropertySources();
        sources.addFirst(source); // Choose if you want it first or last
        return source;

    }

In cases where you want to autowire properties to other beans you need to use the annotation @DependsOn to the propertysource bean in order to ensure it is first loaded

Hope it helps