如何在Spring中使用@ComponentScan懒洋洋地加载所有的bean？ [英] How to load all beans lazily with @ComponentScan in Spring?

问题描述

我正在使用基于Java的配置来设置我的Spring应用程序上下文：

I am using Java-based config to set up my Spring application context like this:

@Configuration
@Lazy
@ComponentScan(basePackageClasses = {MyProject.class, OtherProject.class})
public class MyAppConfig {
    ...
}

在配置中明确定义的Bean被懒惰地加载，就像你所期望的那样。但是，使用 @Named 注释的扫描类始终加载。如何解决这个问题？

Beans defined explicitly in the config are loaded lazily, like you would expect. However, scanned classes annotated with @Named are always loaded eagerly. How can I solve this?

任何帮助都不胜感激。

请注意，对于 MyProject 包中的类，我可以通过使用 @Lazy 注释它们来解决此问题。但是另一个项目没有对Spring的依赖，我想保持它（因此 @Named 而不是 @Component ）。

Note that for classes in the MyProject package, I can work around this by annotating them with @Lazy as well. But the other project does not have a dependency to Spring and I want to keep it like that (hence @Named and not @Component).

还要注意，这不会在基于XML的配置中成为问题。在< beans> 标签接缝中设置 default-lazy-init =true想要（虽然我没有测试过）。

Note also that this does not seam to be a problem in XML-based config. There, setting default-lazy-init="true" in the <beans> tag seams to do what I want (although I haven't tested that).

推荐答案

从版本4.1 RC2起，这个bug是固定的，你可以在组件扫描中完成延迟加载：

As of version 4.1 RC2, this bug is fixed, and you can accomplish lazy loading on component scan with:

@ComponentScan(basePackages = ["..."], lazyInit = true)

https://jira.spring.io/browse/SPR-10459

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