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@ -46,7 +46,7 @@ import org.springframework.stereotype.Component;
@@ -46,7 +46,7 @@ import org.springframework.stereotype.Component;
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* |
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* <h3>Via {@code AnnotationConfigApplicationContext}</h3> |
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* |
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* {@code @Configuration} classes are typically bootstrapped using either |
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* <p>{@code @Configuration} classes are typically bootstrapped using either |
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* {@link AnnotationConfigApplicationContext} or its web-capable variant, |
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* {@link org.springframework.web.context.support.AnnotationConfigWebApplicationContext |
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* AnnotationConfigWebApplicationContext}. A simple example with the former follows: |
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@ -59,15 +59,17 @@ import org.springframework.stereotype.Component;
@@ -59,15 +59,17 @@ import org.springframework.stereotype.Component;
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* // use myBean ...
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* </pre> |
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* |
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* See {@link AnnotationConfigApplicationContext} Javadoc for further details and see |
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* <p>See the {@link AnnotationConfigApplicationContext} javadocs for further details, and see |
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* {@link org.springframework.web.context.support.AnnotationConfigWebApplicationContext |
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* AnnotationConfigWebApplicationContext} for {@code web.xml} configuration instructions. |
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* AnnotationConfigWebApplicationContext} for web configuration instructions in a |
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* {@code Servlet} container. |
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* |
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* <h3>Via Spring {@code <beans>} XML</h3> |
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* |
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* <p>As an alternative to registering {@code @Configuration} classes directly against an |
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* {@code AnnotationConfigApplicationContext}, {@code @Configuration} classes may be |
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* declared as normal {@code <bean>} definitions within Spring XML files: |
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* |
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* <pre class="code"> |
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* <beans> |
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* <context:annotation-config/> |
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@ -75,7 +77,7 @@ import org.springframework.stereotype.Component;
@@ -75,7 +77,7 @@ import org.springframework.stereotype.Component;
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* </beans> |
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* </pre> |
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* |
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* In the example above, {@code <context:annotation-config/>} is required in order to |
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* <p>In the example above, {@code <context:annotation-config/>} is required in order to |
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* enable {@link ConfigurationClassPostProcessor} and other annotation-related |
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* post processors that facilitate handling {@code @Configuration} classes. |
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* |
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@ -113,13 +115,13 @@ import org.springframework.stereotype.Component;
@@ -113,13 +115,13 @@ import org.springframework.stereotype.Component;
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* // various @Bean definitions ...
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* }</pre> |
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* |
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* See the {@link ComponentScan @ComponentScan} javadoc for details. |
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* <p>See the {@link ComponentScan @ComponentScan} javadocs for details. |
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* |
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* <h2>Working with externalized values</h2> |
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* |
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* <h3>Using the {@code Environment} API</h3> |
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* |
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* Externalized values may be looked up by injecting the Spring |
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* <p>Externalized values may be looked up by injecting the Spring |
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* {@link org.springframework.core.env.Environment} into a {@code @Configuration} |
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* class — for example, using the {@code @Autowired} annotation: |
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* |
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@ -137,7 +139,7 @@ import org.springframework.stereotype.Component;
@@ -137,7 +139,7 @@ import org.springframework.stereotype.Component;
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* } |
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* }</pre> |
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* |
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* Properties resolved through the {@code Environment} reside in one or more "property |
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* <p>Properties resolved through the {@code Environment} reside in one or more "property |
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* source" objects, and {@code @Configuration} classes may contribute property sources to |
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* the {@code Environment} object using the {@link PropertySource @PropertySource} |
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* annotation: |
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@ -155,13 +157,13 @@ import org.springframework.stereotype.Component;
@@ -155,13 +157,13 @@ import org.springframework.stereotype.Component;
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* } |
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* }</pre> |
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* |
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* See {@link org.springframework.core.env.Environment Environment} |
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* and {@link PropertySource @PropertySource} Javadoc for further details. |
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* <p>See the {@link org.springframework.core.env.Environment Environment} |
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* and {@link PropertySource @PropertySource} javadocs for further details. |
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* |
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* <h3>Using the {@code @Value} annotation</h3> |
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* |
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* Externalized values may be 'wired into' {@code @Configuration} classes using |
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* the {@link Value @Value} annotation: |
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* <p>Externalized values may be injected {@code @Configuration} classes using the |
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* {@link Value @Value} annotation: |
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* |
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* <pre class="code"> |
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* @Configuration |
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@ -176,13 +178,13 @@ import org.springframework.stereotype.Component;
@@ -176,13 +178,13 @@ import org.springframework.stereotype.Component;
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* } |
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* }</pre> |
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* |
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* This approach is most useful when using Spring's |
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* <p>This approach is most useful when using Spring's |
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* {@link org.springframework.context.support.PropertySourcesPlaceholderConfigurer |
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* PropertySourcesPlaceholderConfigurer}, usually enabled via XML with |
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* {@code <context:property-placeholder/>}. See the section below on composing |
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* {@code @Configuration} classes with Spring XML using {@code @ImportResource}, |
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* see {@link Value @Value} Javadoc, and see {@link Bean @Bean} Javadoc for details |
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* on working with {@code BeanFactoryPostProcessor} types such as |
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* see the {@link Value @Value} javadocs, and see the {@link Bean @Bean} javadocs for |
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* details on working with {@code BeanFactoryPostProcessor} types such as |
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* {@code PropertySourcesPlaceholderConfigurer}. |
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* |
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* <h2>Composing {@code @Configuration} classes</h2> |
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@ -221,7 +223,7 @@ import org.springframework.stereotype.Component;
@@ -221,7 +223,7 @@ import org.springframework.stereotype.Component;
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* } |
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* }</pre> |
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* |
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* Now both {@code AppConfig} and the imported {@code DatabaseConfig} can be bootstrapped |
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* <p>Now both {@code AppConfig} and the imported {@code DatabaseConfig} can be bootstrapped |
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* by registering only {@code AppConfig} against the Spring context: |
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* |
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* <pre class="code"> |
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@ -229,7 +231,7 @@ import org.springframework.stereotype.Component;
@@ -229,7 +231,7 @@ import org.springframework.stereotype.Component;
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* |
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* <h3>With the {@code @Profile} annotation</h3> |
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* |
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* {@code @Configuration} classes may be marked with the {@link Profile @Profile} annotation to |
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* <p>{@code @Configuration} classes may be marked with the {@link Profile @Profile} annotation to |
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* indicate they should be processed only if a given profile or profiles are <em>active</em>: |
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* |
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* <pre class="code"> |
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@ -253,8 +255,8 @@ import org.springframework.stereotype.Component;
@@ -253,8 +255,8 @@ import org.springframework.stereotype.Component;
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* } |
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* }</pre> |
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* |
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* Alternatively, you may also declare profile conditions at the {@code @Bean} method level, |
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* e.g. for alternative bean variants within the same configuration class: |
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* <p>Alternatively, you may also declare profile conditions at the {@code @Bean} method level |
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* — for example, for alternative bean variants within the same configuration class: |
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* |
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* <pre class="code"> |
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* @Configuration |
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@ -269,12 +271,12 @@ import org.springframework.stereotype.Component;
@@ -269,12 +271,12 @@ import org.springframework.stereotype.Component;
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* public DataSource productionDatabase() { ... } |
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* }</pre> |
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* |
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* See the {@link Profile @Profile} and {@link org.springframework.core.env.Environment} |
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* <p>See the {@link Profile @Profile} and {@link org.springframework.core.env.Environment} |
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* javadocs for further details. |
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* |
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* <h3>With Spring XML using the {@code @ImportResource} annotation</h3> |
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* |
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* As mentioned above, {@code @Configuration} classes may be declared as regular Spring |
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* <p>As mentioned above, {@code @Configuration} classes may be declared as regular Spring |
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* {@code <bean>} definitions within Spring XML files. It is also possible to |
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* import Spring XML configuration files into {@code @Configuration} classes using |
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* the {@link ImportResource @ImportResource} annotation. Bean definitions imported from |
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@ -296,7 +298,7 @@ import org.springframework.stereotype.Component;
@@ -296,7 +298,7 @@ import org.springframework.stereotype.Component;
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* |
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* <h3>With nested {@code @Configuration} classes</h3> |
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* |
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* {@code @Configuration} classes may be nested within one another as follows: |
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* <p>{@code @Configuration} classes may be nested within one another as follows: |
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* |
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* <pre class="code"> |
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* @Configuration |
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@ -318,11 +320,11 @@ import org.springframework.stereotype.Component;
@@ -318,11 +320,11 @@ import org.springframework.stereotype.Component;
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* } |
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* }</pre> |
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* |
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* When bootstrapping such an arrangement, only {@code AppConfig} need be registered |
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* <p>When bootstrapping such an arrangement, only {@code AppConfig} need be registered |
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* against the application context. By virtue of being a nested {@code @Configuration} |
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* class, {@code DatabaseConfig} <em>will be registered automatically</em>. This avoids |
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* the need to use an {@code @Import} annotation when the relationship between |
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* {@code AppConfig} {@code DatabaseConfig} is already implicitly clear. |
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* {@code AppConfig} and {@code DatabaseConfig} is already implicitly clear. |
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* |
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* <p>Note also that nested {@code @Configuration} classes can be used to good effect |
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* with the {@code @Profile} annotation to provide two options of the same bean to the |
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@ -338,7 +340,7 @@ import org.springframework.stereotype.Component;
@@ -338,7 +340,7 @@ import org.springframework.stereotype.Component;
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* |
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* <h2>Testing support for {@code @Configuration} classes</h2> |
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* |
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* The Spring <em>TestContext framework</em> available in the {@code spring-test} module |
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* <p>The Spring <em>TestContext framework</em> available in the {@code spring-test} module |
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* provides the {@code @ContextConfiguration} annotation which can accept an array of |
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* {@code @Configuration} {@code Class} objects: |
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* |
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@ -363,10 +365,10 @@ import org.springframework.stereotype.Component;
@@ -363,10 +365,10 @@ import org.springframework.stereotype.Component;
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* |
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* <h2>Enabling built-in Spring features using {@code @Enable} annotations</h2> |
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* |
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* Spring features such as asynchronous method execution, scheduled task execution, |
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* <p>Spring features such as asynchronous method execution, scheduled task execution, |
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* annotation driven transaction management, and even Spring MVC can be enabled and |
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* configured from {@code @Configuration} |
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* classes using their respective "{@code @Enable}" annotations. See |
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* configured from {@code @Configuration} classes using their respective "{@code @Enable}" |
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* annotations. See |
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* {@link org.springframework.scheduling.annotation.EnableAsync @EnableAsync}, |
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* {@link org.springframework.scheduling.annotation.EnableScheduling @EnableScheduling}, |
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* {@link org.springframework.transaction.annotation.EnableTransactionManagement @EnableTransactionManagement}, |
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@ -409,14 +411,15 @@ import org.springframework.stereotype.Component;
@@ -409,14 +411,15 @@ import org.springframework.stereotype.Component;
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public @interface Configuration { |
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/** |
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* Explicitly specify the name of the Spring bean definition associated |
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* with this Configuration class. If left unspecified (the common case), |
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* a bean name will be automatically generated. |
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* <p>The custom name applies only if the Configuration class is picked up via |
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* component scanning or supplied directly to a {@link AnnotationConfigApplicationContext}. |
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* If the Configuration class is registered as a traditional XML bean definition, |
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* the name/id of the bean element will take precedence. |
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* @return the suggested component name, if any (or empty String otherwise) |
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* Explicitly specify the name of the Spring bean definition associated with the |
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* {@code @Configuration} class. If left unspecified (the common case), a bean |
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* name will be automatically generated. |
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* <p>The custom name applies only if the {@code @Configuration} class is picked |
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* up via component scanning or supplied directly to an |
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* {@link AnnotationConfigApplicationContext}. If the {@code @Configuration} class |
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* is registered as a traditional XML bean definition, the name/id of the bean |
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* element will take precedence. |
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* @return the explicit component name, if any (or empty String otherwise) |
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* @see org.springframework.beans.factory.support.DefaultBeanNameGenerator |
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*/ |
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@AliasFor(annotation = Component.class) |
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