Ignore null beans in SimpleAutowireCandidateResolver.resolveAutowireCandidates

Closes gh-34543

Author: jhoeller

spring-beans/src/main/java/org/springframework/beans/factory/support/SimpleAutowireCandidateResolver.java

@@ -66,11 +66,15 @@ public AutowireCandidateResolver cloneIfNecessary() {
 	 * @see org.springframework.beans.factory.config.BeanDefinition#isAutowireCandidate()
 	 * @see AbstractBeanDefinition#isDefaultCandidate()
 	 */
+	@SuppressWarnings("unchecked")
 	public static <T> Map<String, T> resolveAutowireCandidates(ConfigurableListableBeanFactory lbf, Class<T> type) {
 		Map<String, T> candidates = new LinkedHashMap<>();
 		for (String beanName : BeanFactoryUtils.beanNamesForTypeIncludingAncestors(lbf, type)) {
 			if (AutowireUtils.isAutowireCandidate(lbf, beanName)) {
-				candidates.put(beanName, lbf.getBean(beanName, type));
+				Object beanInstance = lbf.getBean(beanName);
+				if (!(beanInstance instanceof NullBean)) {
+					candidates.put(beanName, (T) beanInstance);
+				}
 			}
 		}
 		return candidates;

spring-beans/src/test/java/org/springframework/beans/factory/annotation/AutowiredAnnotationBeanPostProcessorTests.java

@@ -1770,6 +1770,10 @@ void objectProviderInjectionWithNonCandidatesInStream() {
 		parent.registerBeanDefinition("testBean4", tb4);
 		bf.setParentBeanFactory(parent);
 
+		RootBeanDefinition tb5 = new RootBeanDefinition(NullFactoryMethods.class);
+		tb5.setFactoryMethodName("createTestBean");
+		bf.registerBeanDefinition("testBean5", tb5);
+
 		ObjectProviderInjectionBean bean = bf.getBean("annotatedBean", ObjectProviderInjectionBean.class);
 		assertThat(bean.streamTestBeans()).containsExactly(bf.getBean("testBean1", TestBean.class),
 				bf.getBean("testBean2", TestBean.class));
@@ -1789,7 +1793,7 @@ void objectProviderInjectionWithNonCandidatesInStream() {
 		Map<String, TestBean> typeMatches = BeanFactoryUtils.beansOfTypeIncludingAncestors(bf, TestBean.class);
 		assertThat(typeMatches.remove("testBean3")).isNotNull();
 		Map<String, TestBean> candidates = SimpleAutowireCandidateResolver.resolveAutowireCandidates(bf, TestBean.class);
-		assertThat(candidates).containsExactlyEntriesOf(candidates);
+		assertThat(candidates).containsExactlyEntriesOf(typeMatches);
 	}
 
 	@Test