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Document further configuration class restrictions 

Issue: SPR-14602
This commit is contained in:
Juergen Hoeller 2017-01-23 13:39:11 +01:00
parent 253060c21c
commit 6fe7e56598
1 changed files with 9 additions and 4 deletions
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13
spring-context/src/main/java/org/springframework/context/annotation/Configuration.java
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@ -1,5 +1,5 @@
/* /*
* Copyright 2002-2016 the original author or authors. * Copyright 2002-2017 the original author or authors.
* *
* Licensed under the Apache License, Version 2.0 (the "License"); * Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. * you may not use this file except in compliance with the License.
@ -357,9 +357,14 @@ import org.springframework.stereotype.Component;
* <h2>Constraints when authoring {@code @Configuration} classes</h2> * <h2>Constraints when authoring {@code @Configuration} classes</h2>
* *
* <ul> * <ul>
* <li>&#064;Configuration classes must be non-final * <li>Configuration classes must be provided as classes (i.e. not as instances returned
* <li>&#064;Configuration classes must be non-local (may not be declared within a method) * from factory methods), allowing for runtime enhancements through a generated subclass.
* <li>Any nested configuration classes must be {@code static}. * <li>Configuration classes must be non-final.
* <li>Configuration classes must be non-local (i.e. may not be declared within a method).
* <li>Any nested configuration classes must be declared as {@code static}.
* <li>{@code @Bean} methods may not in turn create further configuration classes
* (any such instances will be treated as regular beans, with their configuration
* annotations remaining undetected).
* </ul> * </ul>
* *
* @author Rod Johnson * @author Rod Johnson