Doc: Be more specific regarding circular dependencies in chapter 3 [SPR-525]

[spring-projects-issues]

Torsten Juergeleit opened SPR-525 and commented

Regarding circular dependencies chapter 3 only states the following:

"... You can generally trust Spring to do the right thing. It will pick up configuration issues, including references to non-existent beans and circular dependencies, at BeanFactory load-time. ..."

Reading through the code, e.g. AbstractAutowireCapableBeanFactory.createBean()

"...
// Eagerly cache singletons to be able to resolve circular references
// even when triggered by lifecycle interfaces like BeanFactoryAware.
if (allowEagerCaching && mergedBeanDefinition.isSingleton()) {
addSingleton(beanName, bean);
eagerlyCached = true;
}
..."

or the forum, e.g. http://forum.springframework.org/viewtopic.php?t=1481
gives some hints.

Please add some lines how Spring handles / detects circular dependencies. Additionally some sugestions on how to omit / workaround circular dependencies à la Andreas' sugesstion in http://forum.springframework.org/viewtopic.php?t=1481 would be great.

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Affects: 1.1.2

[spring-projects-issues]

Rick Evans commented

Fixed.

Added a sidebar to the IoC chapter explaining the issue, and provided two possible workarounds / solutions.