Introduce processInjection() in CommonAnnotationBeanPostProcessor

To align with the existing processInjection() method in
AutowiredAnnotationBeanPostProcessor, this commit introduces an analogous
method in CommonAnnotationBeanPostProcessor.

Closes gh-31956

spring-context/src/main/java/org/springframework/context/annotation/CommonAnnotationBeanPostProcessor.java

@@ -371,6 +371,29 @@ public class CommonAnnotationBeanPostProcessor extends InitDestroyAnnotationBean
 		return pvs;
 	}
 
+	/**
+	 * <em>Native</em> processing method for direct calls with an arbitrary target
+	 * instance, resolving all of its fields and methods which are annotated with
+	 * one of the supported 'resource' annotation types.
+	 * @param bean the target instance to process
+	 * @throws BeanCreationException if resource injection failed
+	 * @since 6.1.3
+	 */
+	public void processInjection(Object bean) throws BeanCreationException {
+		Class<?> clazz = bean.getClass();
+		InjectionMetadata metadata = findResourceMetadata(clazz.getName(), clazz, null);
+		try {
+			metadata.inject(bean, null, null);
+		}
+		catch (BeanCreationException ex) {
+			throw ex;
+		}
+		catch (Throwable ex) {
+			throw new BeanCreationException(
+					"Injection of resource dependencies failed for class [" + clazz + "]", ex);
+		}
+	}
+
 
 	private InjectionMetadata findResourceMetadata(String beanName, Class<?> clazz, @Nullable PropertyValues pvs) {
 		// Fall back to class name as cache key, for backwards compatibility with custom callers.

spring-context/src/test/java/org/springframework/context/annotation/CommonAnnotationBeanPostProcessorTests.java

@@ -52,6 +52,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Juergen Hoeller
  * @author Chris Beams
+ * @author Sam Brannen
  */
 class CommonAnnotationBeanPostProcessorTests {
 
@@ -65,6 +66,20 @@ class CommonAnnotationBeanPostProcessorTests {
 		bf.addBeanPostProcessor(bpp);
 	}
 
+	@Test
+	void processInjection() {
+		ResourceInjectionBean bean = new ResourceInjectionBean();
+		assertThat(bean.getTestBean()).isNull();
+		assertThat(bean.getTestBean2()).isNull();
+
+		TestBean tb = new TestBean();
+		bf.registerSingleton("testBean", tb);
+		bpp.processInjection(bean);
+
+		assertThat(bean.getTestBean()).isSameAs(tb);
+		assertThat(bean.getTestBean2()).isSameAs(tb);
+	}
+
 	@Test
 	void postConstructAndPreDestroy() {
 		bf.registerBeanDefinition("annotatedBean", new RootBeanDefinition(AnnotatedInitDestroyBean.class));