Polish Javadoc

Issue: SPR-14552

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

@@ -84,7 +84,22 @@
  * {@code @Configuration} classes are candidates for component scanning (typically using
  * Spring XML's {@code <context:component-scan/>} element) and therefore may also take
  * advantage of {@link Autowired @Autowired}/{@link javax.inject.Inject @Inject}
- * at the field and method level (but not at the constructor level).
+ * like any regular {@code @Component}. In particular, if a single constructor is present
+ * autowiring semantics will be applied transparently:
+ *
+ * <pre class="code">
+ * &#064;Configuration
+ * public class AppConfig {
+ *     private final SomeBean someBean;
+ *
+ *     public AppConfig(SomeBean someBean) {
+ *         this.someBean = someBean;
+ *     }
+ *
+ *     // &#064;Bean definition using "SomeBean"
+ *
+ * }</pre>
+ *
  * <p>{@code @Configuration} classes may not only be bootstrapped using
  * component scanning, but may also themselves <em>configure</em> component scanning using
  * the {@link ComponentScan @ComponentScan} annotation:
@@ -104,13 +119,13 @@
  *
  * Externalized values may be looked up by injecting the Spring
  * {@link org.springframework.core.env.Environment} into a {@code @Configuration}
- * class using the {@code @Autowired} or the {@code @Inject} annotation:
+ * class the usual (e.g. using the {@code @Autowired} annotation):
  *
  * <pre class="code">
  * &#064;Configuration
  * public class AppConfig {
  *
- *     &#064Inject Environment env;
+ *     &#064Autowired Environment env;
  *
  *     &#064;Bean
  *     public MyBean myBean() {
@@ -175,7 +190,7 @@
  * <p>{@code @Configuration} classes may be composed using the {@link Import @Import} annotation,
  * not unlike the way that {@code <import>} works in Spring XML. Because
  * {@code @Configuration} objects are managed as Spring beans within the container,
- * imported configurations may be injected using {@code @Autowired} or {@code @Inject}:
+ * imported configurations may be injected the usual way (e.g. via constructor injection):
  *
  * <pre class="code">
  * &#064;Configuration
@@ -191,7 +206,11 @@
  * &#064;Import(DatabaseConfig.class)
  * public class AppConfig {
  *
- *     &#064Inject DatabaseConfig dataConfig;
+ *     private final DatabaseConfig dataConfig;
+ *
+ *     public AppConfig(DatabaseConfig dataConfig) {
+ *         this.dataConfig = dataConfig;
+ *     }
  *
  *     &#064;Bean
  *     public MyBean myBean() {
@@ -240,8 +259,8 @@
  * As mentioned above, {@code @Configuration} classes may be declared as regular Spring
  * {@code <bean>} definitions within Spring XML files. It is also possible to
  * import Spring XML configuration files into {@code @Configuration} classes using
- * the {@link ImportResource @ImportResource} annotation. Bean definitions imported from XML can be
- * injected using {@code @Autowired} or {@code @Inject}:
+ * the {@link ImportResource @ImportResource} annotation. Bean definitions imported from
+ * XML can be injected the usual way (e.g. using the {@code Inject} annotation):
  *
  * <pre class="code">
  * &#064;Configuration
@@ -340,9 +359,7 @@
  * <ul>
  * <li>&#064;Configuration classes must be non-final
  * <li>&#064;Configuration classes must be non-local (may not be declared within a method)
- * <li>&#064;Configuration classes must have a default/no-arg constructor and may not use
- * {@link Autowired @Autowired} constructor parameters. Any nested configuration classes
- * must be {@code static}.
+ * <li>Any nested configuration classes must be {@code static}.
  * </ul>
  *
  * @author Rod Johnson