How To Configure Java EE 6+ Applications ...Without XML

Primitives can be directly injected to EJBs and CDI managed beans with @Inject:

@Singleton
@Startup
public class HitsFlushTimer {

    @Inject
    private int hitsFlushRate;

 }

@Startup
@Singleton
public class Configuration {

    private Map configuration;
    private Set unconfiguredFields;

    @Inject
    private Instance configurationProvider;

    @PostConstruct
    public void fetchConfiguration() {
		//default values...
        this.configuration = new HashMap() {{
            put("hitsFlushRate", "1");
		    //...
        }};
        this.unconfiguredFields = new HashSet();
        mergeWithCustomConfiguration();
    }


  @javax.enterprise.inject.Produces
    public String getString(InjectionPoint point) {
        String fieldName = point.getMember().getName();
        String valueForFieldName = configuration.get(fieldName);
        if (valueForFieldName == null) {
            this.unconfiguredFields.add(fieldName);
        }
        return valueForFieldName;
    }

    @javax.enterprise.inject.Produces
    public int getInteger(InjectionPoint point) {
        String stringValue = getString(point);
        if (stringValue == null) {
            return 0;
        }
        return Integer.parseInt(stringValue);
    }

//...
}