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Consistent data class constructor resolution with clear error message

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MVC data class processor constructs target instance even in case of binding failure, as long as the corresponding method parameter is not marked as optional.

Closes gh-24372
This commit is contained in:
Juergen Hoeller
2020-09-01 19:10:32 +02:00
parent 278c6d5cdb
commit e20bff9c64
5 changed files with 93 additions and 49 deletions
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16
spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/ModelAttributeMethodArgumentResolver.java
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@@ -201,21 +201,7 @@ public class ModelAttributeMethodArgumentResolver extends HandlerMethodArgumentR
private Mono<?> createAttribute(
String attributeName, Class<?> clazz, BindingContext context, ServerWebExchange exchange) {
Constructor<?> ctor = BeanUtils.findPrimaryConstructor(clazz);
if (ctor == null) {
Constructor<?>[] ctors = clazz.getConstructors();
if (ctors.length == 1) {
ctor = ctors[0];
}
else {
try {
ctor = clazz.getDeclaredConstructor();
}
catch (NoSuchMethodException ex) {
throw new IllegalStateException("No primary or default constructor found for " + clazz, ex);
}
}
}
Constructor<?> ctor = BeanUtils.getResolvableConstructor(clazz);
return constructAttribute(ctor, attributeName, context, exchange);
}