gh-32154: BeanWrapper - fix autogrow for nested maps

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

@@ -649,11 +649,14 @@ else if (value instanceof List list) {
 						value = list.get(index);
 					}
 					else if (value instanceof Map map) {
-						Class<?> mapKeyType = ph.getResolvableType().getNested(i + 1).asMap().resolveGeneric(0);
+						ResolvableType mapResolvableType = ph.getResolvableType().getNested(i + 1).asMap();
+						Class<?> mapKeyType = mapResolvableType.resolveGeneric(0);
+						Class<?> mapValueType = mapResolvableType.resolveGeneric(1);
 						// IMPORTANT: Do not pass full property name in here - property editors
 						// must not kick in for map keys but rather only for map values.
 						TypeDescriptor typeDescriptor = TypeDescriptor.valueOf(mapKeyType);
 						Object convertedMapKey = convertIfNecessary(null, null, key, mapKeyType, typeDescriptor);
+						growMapIfNecessary(map, convertedMapKey, mapValueType, indexedPropertyName.toString());
 						value = map.get(convertedMapKey);
 					}
 					else if (value instanceof Iterable iterable) {
@@ -792,6 +795,17 @@ private void growCollectionIfNecessary(Collection<Object> collection, int index,
 		}
 	}
 
+	private void growMapIfNecessary(Map<Object, Object> map, @Nullable Object convertedMapKey,
+			@Nullable Class<?> mapValueType, String name) {
+
+		if (mapValueType == null || !isAutoGrowNestedPaths()) {
+			return;
+		}
+		if (!map.containsKey(convertedMapKey) && map.size() < this.autoGrowCollectionLimit) {
+			map.put(convertedMapKey, newValue(mapValueType, null, name));
+		}
+	}
+
 	/**
 	 * Get the last component of the path. Also works if not nested.
 	 * @param pa property accessor to work on

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

@@ -20,7 +20,6 @@
 import java.util.Map;
 
 import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -200,6 +199,13 @@ void getPropertyValueAutoGrowNestedNestedList() {
 		assertThat(bean.getNestedNestedList().get(0).get(0)).singleElement().isInstanceOf(Bean.class);
 	}
 
+	@Test
+	void getPropertyValueAutoGrowNestedNestedMap() {
+		assertThat(wrapper.getPropertyValue("nestedNestedMap[A][B][C]")).isNotNull();
+		assertThat(bean.getNestedNestedMap()).hasSize(1);
+		assertThat(bean.getNestedNestedMap().get("A").get("B").get("C")).isInstanceOf(Bean.class);
+	}
+
 	@Test
 	void getPropertyValueAutoGrowListNotParameterized() {
 		assertThatExceptionOfType(InvalidPropertyException.class).isThrownBy(() ->
@@ -224,7 +230,7 @@ void setPropertyValueAutoGrowNestedMapWithinMap() {
 		assertThat(bean.getNestedMap().get("A").get("B")).isInstanceOf(Bean.class);
 	}
 
-	@Test @Disabled  // gh-32154
+	@Test
 	void setPropertyValueAutoGrowNestedNestedMapWithinMap() {
 		wrapper.setPropertyValue("nestedNestedMap[A][B][C]", new Bean());
 		assertThat(bean.getNestedNestedMap().get("A").get("B").get("C")).isInstanceOf(Bean.class);