Update documentation

Issue: SPR-12278

Author: snicoll

src/asciidoc/core-beans.adoc

@@ -4168,18 +4168,24 @@ references and values even when you use the class outside of a container.
 [[beans-autowired-annotation]]
 === @Autowired
 
-As expected, you can apply the `@Autowired` annotation to "traditional" setter methods:
+[NOTE]
+====
+JSR 330's `@Inject` annotation can be used in place of Spring's `@Autowired` annotation
+in the examples below. See <<beans-standard-annotations,here>> for more details.
+====
+
+You can apply the `@Autowired` annotation to constructors:
 
 [source,java,indent=0]
 [subs="verbatim,quotes"]
 ----
-	public class SimpleMovieLister {
+	public class MovieRecommender {
 
-		private MovieFinder movieFinder;
+		private final CustomerPreferenceDao customerPreferenceDao;
 
 		@Autowired
-		public void setMovieFinder(MovieFinder movieFinder) {
-			this.movieFinder = movieFinder;
+		public MovieRecommender(CustomerPreferenceDao customerPreferenceDao) {
+			this.customerPreferenceDao = customerPreferenceDao;
 		}
 
 		// ...
@@ -4189,10 +4195,31 @@ As expected, you can apply the `@Autowired` annotation to "traditional" setter m
 
 [NOTE]
 ====
-JSR 330's `@Inject` annotation can be used in place of Spring's `@Autowired` annotation
-in the examples below. See <<beans-standard-annotations,here>> for more details.
+As of Spring Framework 4.3, the `@Autowired` constructor is no longer necessary if the
+target bean only defines one constructor. If several constructors are available, at
+least one must be annotated to teach the container which one it has to use.
 ====
 
+As expected, you can also apply the `@Autowired` annotation to "traditional" setter
+methods:
+
+[source,java,indent=0]
+[subs="verbatim,quotes"]
+----
+	public class SimpleMovieLister {
+
+		private MovieFinder movieFinder;
+
+		@Autowired
+		public void setMovieFinder(MovieFinder movieFinder) {
+			this.movieFinder = movieFinder;
+		}
+
+		// ...
+
+	}
+----
+
 You can also apply the annotation to methods with arbitrary names and/or multiple
 arguments:
 
@@ -4217,18 +4244,18 @@ arguments:
 	}
 ----
 
-You can apply `@Autowired` to constructors and fields:
+You can apply `@Autowired` to fields as well and even mix it with constructors:
 
 [source,java,indent=0]
 [subs="verbatim,quotes"]
 ----
 	public class MovieRecommender {
 
+		private final CustomerPreferenceDao customerPreferenceDao;
+
 		@Autowired
 		private MovieCatalog movieCatalog;
 
-		private CustomerPreferenceDao customerPreferenceDao;
-
 		@Autowired
 		public MovieRecommender(CustomerPreferenceDao customerPreferenceDao) {
 			this.customerPreferenceDao = customerPreferenceDao;

src/asciidoc/whats-new.adoc

@@ -627,6 +627,12 @@ public @interface MyTestConfig {
 [[new-in-4.3]]
 == New Features and Enhancements in Spring Framework 4.3
 
+=== Core Container Improvements
+
+* It is no longer necessary to specify the `@Autowired` annotation if the target
+  bean only define one constructor.
+
+
 === Testing Improvements
 
 * The JUnit support in the _Spring TestContext Framework_ now requires JUnit 4.12 or higher.