I'm new to Spring Boot. In my Controller I'm using UUIDs as @PathVariable. By default spring returns MethodArgumentTypeMismatchException when passing an invalid UUID.
When the client passes an invalid UUID I want to throw a custom InvalidUUIDException, so that I'm able to return a customized ErrorDto using this Exception.
To archieve that I'm trying to register a custom UUIDConverter (implementing org.springframework.core.convert.converter.Converter).
@Component
public class UUIDConverter implements Converter<String, UUID>
{
private static final Pattern pattern = Pattern.compile("[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}");
@Override
public UUID convert(String input) throws InvalidUuidException
{
if (!pattern.matcher(input).matches()) {
throw new InvalidUuidException(input);
}
return UUID.fromString(input);
}
}
To register this component, I'm adding this Converter to springs ConversionService. Using the ConversionServiceFactoryBean.
@Configuration
public class ConversionServiceConfiguration
{
@Bean
public ConversionServiceFactoryBean conversionService()
{
ConversionServiceFactoryBean bean = new ConversionServiceFactoryBean();
bean.setConverters(getConverters());
return bean;
}
private Set<Converter> getConverters()
{
Set<Converter> converters = new HashSet<>();
converters.add(new UUIDConverter());
return converters;
}
}
I've tried also to use @Component instead of @Configuration as it was mentioned here: Spring not using mongo custom converters
Other solutions I tried out: Naming the bean conversionServiceFactoryBean instead of conversionService. Or calling bean.afterPropertiesSet() and retuning a ConversionService using bean.getObject() ...
I've also tried to extend from WebMvcConfigurerAdapter, overriding addFormatters and add my converter there using addConverter...
As mentioned here: How to register custom converters in spring boot? I've also tried to register the converter as a @Bean directly.
It does not matter what I tried out, the UUIDConverter will not be applied.
What is the correct solution do something like that in spring-boot?
Can anyone help here? What I'm doing wrong?
