Relax GraalVM check in DefaultParameterNameDiscoverer

Prior to this commit, DefaultParameterNameDiscoverer did not register
any discovers when compiling or running as a GraalVM native image.

This commit relaxes the GraalVM check so that it is only applied to the
registration of KotlinReflectionParameterNameDiscoverer.

Consequently, StandardReflectionParameterNameDiscoverer and
LocalVariableTableParameterNameDiscoverer are once again always
registered by DefaultParameterNameDiscoverer.

Closes gh-24600

spring-core/src/main/java/org/springframework/core/DefaultParameterNameDiscoverer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,14 +23,15 @@ package org.springframework.core;
  * debug information in the class file.
  *
  * <p>If a Kotlin reflection implementation is present,
- * {@link KotlinReflectionParameterNameDiscoverer} is added first in the list and used
- * for Kotlin classes and interfaces. When compiling or running as a Graal native image,
- * no {@link ParameterNameDiscoverer} is used.
+ * {@link KotlinReflectionParameterNameDiscoverer} is added first in the list and
+ * used for Kotlin classes and interfaces. When compiling or running as a GraalVM
+ * native image, the {@code KotlinReflectionParameterNameDiscoverer} is not used.
  *
  * <p>Further discoverers may be added through {@link #addDiscoverer(ParameterNameDiscoverer)}.
  *
  * @author Juergen Hoeller
  * @author Sebastien Deleuze
+ * @author Sam Brannen
  * @since 4.0
  * @see StandardReflectionParameterNameDiscoverer
  * @see LocalVariableTableParameterNameDiscoverer
@@ -39,13 +40,11 @@ package org.springframework.core;
 public class DefaultParameterNameDiscoverer extends PrioritizedParameterNameDiscoverer {
 
 	public DefaultParameterNameDiscoverer() {
-		if (!GraalDetector.inImageCode()) {
-			if (KotlinDetector.isKotlinReflectPresent()) {
-				addDiscoverer(new KotlinReflectionParameterNameDiscoverer());
-			}
-			addDiscoverer(new StandardReflectionParameterNameDiscoverer());
-			addDiscoverer(new LocalVariableTableParameterNameDiscoverer());
+		if (KotlinDetector.isKotlinReflectPresent() && !GraalDetector.inImageCode()) {
+			addDiscoverer(new KotlinReflectionParameterNameDiscoverer());
 		}
+		addDiscoverer(new StandardReflectionParameterNameDiscoverer());
+		addDiscoverer(new LocalVariableTableParameterNameDiscoverer());
 	}
 
 }