Refine AbstractKotlinSerializationHttpMessageConverter#canWrite

AbstractKotlinSerializationHttpMessageConverter#writeInternal is able to
resolve the ResolvableType from the Object parameter when the provided
one via the ResolvableType parameter is not resolvable, but
AbstractKotlinSerializationHttpMessageConverter#canWrite lacks of
such capability.

This commit refines
AbstractKotlinSerializationHttpMessageConverter#canWrite to resolve the
ResolvableType from the Class<?> parameter when the provided one via the
ResolvableType parameter is not resolvable.

Closes gh-35920

Author: sdeleuze

spring-web/src/main/java/org/springframework/http/converter/AbstractKotlinSerializationHttpMessageConverter.java

@@ -112,11 +112,12 @@ public boolean canRead(ResolvableType type, @Nullable MediaType mediaType) {
 	}
 
 	@Override
-	public boolean canWrite(ResolvableType type, Class<?> clazz, @Nullable MediaType mediaType) {
-		if (!this.typePredicate.test(type) || ResolvableType.NONE.equals(type)) {
+	public boolean canWrite(ResolvableType type, Class<?> valueClass, @Nullable MediaType mediaType) {
+		ResolvableType resolvableType = (ResolvableType.NONE.equals(type) ? ResolvableType.forClass(valueClass) : type);
+		if (!this.typePredicate.test(resolvableType)) {
 			return false;
 		}
-		return serializer(type, null) != null && canWrite(mediaType);
+		return serializer(resolvableType, null) != null && canWrite(mediaType);
 	}
 
 	@Override

spring-web/src/test/kotlin/org/springframework/http/converter/json/KotlinSerializationJsonHttpMessageConverterTests.kt

@@ -128,7 +128,7 @@ class KotlinSerializationJsonHttpMessageConverterTests {
 		assertThat(converter.canWrite(resolvableTypeOf<Ordered>(), Ordered::class.java, MediaType.APPLICATION_JSON)).isFalse()
 		assertThat(converter.canWrite(resolvableTypeOf<OrderedImpl>(), OrderedImpl::class.java, MediaType.APPLICATION_JSON)).isFalse()
 
-		assertThat(converter.canWrite(ResolvableType.NONE, SerializableBean::class.java, MediaType.APPLICATION_JSON)).isFalse()
+		assertThat(converter.canWrite(ResolvableType.NONE, SerializableBean::class.java, MediaType.APPLICATION_JSON)).isTrue()
 
 		assertThat(converter.canWrite(ResolvableType.forType(BigDecimal::class.java), BigDecimal::class.java, MediaType.APPLICATION_JSON)).isFalse()
 	}
@@ -156,7 +156,7 @@ class KotlinSerializationJsonHttpMessageConverterTests {
 		assertThat(converterWithAllTypes.canWrite(resolvableTypeOf<Ordered>(), Ordered::class.java, MediaType.APPLICATION_JSON)).isTrue()
 		assertThat(converterWithAllTypes.canWrite(resolvableTypeOf<OrderedImpl>(), OrderedImpl::class.java, MediaType.APPLICATION_JSON)).isFalse()
 
-		assertThat(converterWithAllTypes.canWrite(ResolvableType.NONE, SerializableBean::class.java, MediaType.APPLICATION_JSON)).isFalse()
+		assertThat(converterWithAllTypes.canWrite(ResolvableType.NONE, SerializableBean::class.java, MediaType.APPLICATION_JSON)).isTrue()
 
 		assertThat(converterWithAllTypes.canWrite(ResolvableType.forType(BigDecimal::class.java), BigDecimal::class.java, MediaType.APPLICATION_JSON)).isFalse()
 	}