UUIDConverter plugged..

RepositoryRestConfiguration.java

/**
	 * Either the user's pre-configured {@link ConversionService} or the
	 * {@link DefaultConversionService}.
	 * 
	 * @return
	 */
	@Bean
	ConversionService conversionService() {
		if (null != customConversionService) {			
			return customConversionService;
		} else {
			defaultConversionService.addConverter(new StringToUUIDConverter());
			return defaultConversionService;
		}
	}

StringToUUIDConverter.java

public class StringToUUIDConverter implements Converter<String, UUID> {

	public UUID convert(String source) {
		if (source != null)
			return UUID.fromString(source);
		else
			return null;
	}
}