Restore ability to configure setClassLoader methods

Closes gh-28269

Author: jhoeller

spring-beans/src/main/java/org/springframework/beans/CachedIntrospectionResults.java

@@ -287,13 +287,15 @@ private CachedIntrospectionResults(Class<?> beanClass) throws BeansException {
 			// This call is slow so we do it once.
 			PropertyDescriptor[] pds = this.beanInfo.getPropertyDescriptors();
 			for (PropertyDescriptor pd : pds) {
-				if (Class.class == beanClass && (!"name".equals(pd.getName()) && !pd.getName().endsWith("Name"))) {
+				if (Class.class == beanClass && !("name".equals(pd.getName()) ||
+						(pd.getName().endsWith("Name") && String.class == pd.getPropertyType()))) {
 					// Only allow all name variants of Class properties
 					continue;
 				}
-				if (pd.getPropertyType() != null && (ClassLoader.class.isAssignableFrom(pd.getPropertyType())
-						|| ProtectionDomain.class.isAssignableFrom(pd.getPropertyType()))) {
-					// Ignore ClassLoader and ProtectionDomain types - nobody needs to bind to those
+				if (pd.getWriteMethod() == null && pd.getPropertyType() != null &&
+						(ClassLoader.class.isAssignableFrom(pd.getPropertyType()) ||
+								ProtectionDomain.class.isAssignableFrom(pd.getPropertyType()))) {
+					// Ignore ClassLoader and ProtectionDomain read-only properties - no need to bind to those
 					continue;
 				}
 				if (logger.isTraceEnabled()) {
@@ -342,9 +344,10 @@ private void introspectInterfaces(Class<?> beanClass, Class<?> currClass, Set<St
 						// GenericTypeAwarePropertyDescriptor leniently resolves a set* write method
 						// against a declared read method, so we prefer read method descriptors here.
 						pd = buildGenericTypeAwarePropertyDescriptor(beanClass, pd);
-						if (pd.getPropertyType() != null && (ClassLoader.class.isAssignableFrom(pd.getPropertyType())
-								|| ProtectionDomain.class.isAssignableFrom(pd.getPropertyType()))) {
-							// Ignore ClassLoader and ProtectionDomain types - nobody needs to bind to those
+						if (pd.getWriteMethod() == null && pd.getPropertyType() != null &&
+								(ClassLoader.class.isAssignableFrom(pd.getPropertyType()) ||
+										ProtectionDomain.class.isAssignableFrom(pd.getPropertyType()))) {
+							// Ignore ClassLoader and ProtectionDomain read-only properties - no need to bind to those
 							continue;
 						}
 						this.propertyDescriptors.put(pd.getName(), pd);

spring-beans/src/test/java/org/springframework/beans/BeanWrapperTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -23,6 +23,8 @@
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.testfixture.beans.TestBean;
+import org.springframework.core.OverridingClassLoader;
+import org.springframework.core.io.DefaultResourceLoader;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
@@ -105,7 +107,7 @@ void checkNotWritablePropertyHoldPossibleMatches() {
 			.satisfies(ex -> assertThat(ex.getPossibleMatches()).containsExactly("age"));
 	}
 
-	@Test // Can't be shared; there is no such thing as a read-only field
+	@Test  // Can't be shared; there is no such thing as a read-only field
 	void setReadOnlyMapProperty() {
 		TypedReadOnlyMap map = new TypedReadOnlyMap(Collections.singletonMap("key", new TestBean()));
 		TypedReadOnlyMapClient target = new TypedReadOnlyMapClient();
@@ -157,12 +159,34 @@ void propertyDescriptors() {
 		BeanWrapper accessor = createAccessor(target);
 		accessor.setPropertyValue("name", "a");
 		accessor.setPropertyValue("spouse.name", "b");
+
 		assertThat(target.getName()).isEqualTo("a");
 		assertThat(target.getSpouse().getName()).isEqualTo("b");
 		assertThat(accessor.getPropertyValue("name")).isEqualTo("a");
 		assertThat(accessor.getPropertyValue("spouse.name")).isEqualTo("b");
 		assertThat(accessor.getPropertyDescriptor("name").getPropertyType()).isEqualTo(String.class);
 		assertThat(accessor.getPropertyDescriptor("spouse.name").getPropertyType()).isEqualTo(String.class);
+
+		assertThat(accessor.isReadableProperty("class.package")).isFalse();
+		assertThat(accessor.isReadableProperty("class.module")).isFalse();
+		assertThat(accessor.isReadableProperty("class.classLoader")).isFalse();
+		assertThat(accessor.isReadableProperty("class.name")).isTrue();
+		assertThat(accessor.isReadableProperty("class.simpleName")).isTrue();
+		assertThat(accessor.getPropertyValue("class.name")).isEqualTo(TestBean.class.getName());
+		assertThat(accessor.getPropertyValue("class.simpleName")).isEqualTo(TestBean.class.getSimpleName());
+		assertThat(accessor.getPropertyDescriptor("class.name").getPropertyType()).isEqualTo(String.class);
+		assertThat(accessor.getPropertyDescriptor("class.simpleName").getPropertyType()).isEqualTo(String.class);
+
+		accessor = createAccessor(new DefaultResourceLoader());
+
+		assertThat(accessor.isReadableProperty("class.package")).isFalse();
+		assertThat(accessor.isReadableProperty("class.module")).isFalse();
+		assertThat(accessor.isReadableProperty("class.classLoader")).isFalse();
+		assertThat(accessor.isReadableProperty("classLoader")).isTrue();
+		assertThat(accessor.isWritableProperty("classLoader")).isTrue();
+		OverridingClassLoader ocl = new OverridingClassLoader(getClass().getClassLoader());
+		accessor.setPropertyValue("classLoader", ocl);
+		assertThat(accessor.getPropertyValue("classLoader")).isSameAs(ocl);
 	}
 
 	@Test