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Stronger warning about lookup methods not working with @Bean

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Issue: SPR-13108
This commit is contained in:
Juergen Hoeller
2015-06-11 09:58:10 +02:00
parent e97506be55
commit 4eea675c15
2 changed files with 21 additions and 16 deletions
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22
src/asciidoc/core-beans.adoc
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@@ -2032,15 +2032,17 @@ overrides the method.
[NOTE]
====
For this dynamic subclassing to work, the class that the Spring container will subclass
cannot be `final`, and the method to be overridden cannot be `final` either. Also,
testing a class that has an `abstract` method requires you to subclass the class
yourself and to supply a stub implementation of the `abstract` method. Finally, objects
that have been the target of method injection cannot be serialized. As of Spring 3.2 it
is no longer necessary to add CGLIB to your classpath, because CGLIB classes are
repackaged under org.springframework and distributed within the spring-core JAR. This is
done both for convenience as well as to avoid potential conflicts with other projects
that use differing versions of CGLIB.
* For this dynamic subclassing to work, the class that the Spring bean container will
subclass cannot be `final`, and the method to be overridden cannot be `final` either.
* Unit-testing a class that has an `abstract` method requires you to subclass the class
yourself and to supply a stub implementation of the `abstract` method.
* Concrete methods are also necessary for component scanning which requires concrete
classes to pick up.
* A further key limitation is that lookup methods won't work with factory methods and
in particular not with `@Bean` methods in configuration classes, since the container
is not in charge of creating the instance in that case and therefore cannot create
a runtime-generated subclass on the fly.
* Finally, objects that have been the target of method injection cannot be serialized.
====
Looking at the `CommandManager` class in the previous code snippet, you see that the
@@ -2116,7 +2118,7 @@ these classes for additional information.
[[beans-factory-arbitrary-method-replacement]]
==== Arbitrary method replacement
A less useful form of method injection than lookup method Injection is the ability to
A less useful form of method injection than lookup method injection is the ability to
replace arbitrary methods in a managed bean with another method implementation. Users
may safely skip the rest of this section until the functionality is actually needed.