ConfigValue Producer for automatically injecting configuration strings

ConfigValueProducer.java

   	  @Produces
	    @ConfigValue("")
	    @Dependent
	    public String configValueProducer(InjectionPoint ip) {
	        // We know this annotation WILL be present as WELD won't call us otherwise, so no null checking is required.
	        ConfigValue configValue = ip.getAnnotated().getAnnotation(ConfigValue.class);
	        // This could potentially return a null, so the function is annotated @Dependent to avoid a WELD error.
	        return props.getProperty(configValue.value());
	    }