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BeanUtils.getResolvableConstructor falls back to single non-public constructor

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Closes gh-27437
This commit is contained in:
Juergen Hoeller
2021-09-23 15:53:54 +02:00
parent 134c0e2916
commit f9d63e7bb1
1 changed files with 30 additions and 16 deletions
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46
spring-beans/src/main/java/org/springframework/beans/BeanUtils.java
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@@ -226,32 +226,46 @@ public abstract class BeanUtils {
}
/**
* Return a resolvable constructor for the provided class, either a primary constructor
* or single public constructor or simply a default constructor. Callers have to be
* prepared to resolve arguments for the returned constructor's parameters, if any.
* Return a resolvable constructor for the provided class, either a primary or single
* public constructor with arguments, or a single non-public constructor with arguments,
* or simply a default constructor. Callers have to be prepared to resolve arguments
* for the returned constructor's parameters, if any.
* @param clazz the class to check
* @throws IllegalStateException in case of no unique constructor found at all
* @since 5.3
* @see #findPrimaryConstructor
*/
@SuppressWarnings("unchecked")
public static <T> Constructor<T> getResolvableConstructor(Class<T> clazz) {
Constructor<T> ctor = findPrimaryConstructor(clazz);
if (ctor == null) {
Constructor<?>[] ctors = clazz.getConstructors();
if (ctor != null) {
return ctor;
}
Constructor<?>[] ctors = clazz.getConstructors();
if (ctors.length == 1) {
// A single public constructor
return (Constructor<T>) ctors[0];
}
else if (ctors.length == 0){
ctors = clazz.getDeclaredConstructors();
if (ctors.length == 1) {
ctor = (Constructor<T>) ctors[0];
}
else {
try {
ctor = clazz.getDeclaredConstructor();
}
catch (NoSuchMethodException ex) {
throw new IllegalStateException("No primary or single public constructor found for " +
clazz + " - and no default constructor found either");
}
// A single non-public constructor, e.g. from a non-public record type
return (Constructor<T>) ctors[0];
}
}
return ctor;
else {
// Several public constructors -> let's take the default constructor
try {
return clazz.getDeclaredConstructor();
}
catch (NoSuchMethodException ex) {
// Giving up...
}
}
// No unique constructor at all
throw new IllegalStateException("No primary or single unique constructor found for " + clazz);
}
/**