如何在Spring中使用@ComponentScan延迟加载所有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，如下所示:

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 会像您期望的那样延迟加载.但是，使用 @Named 注释的扫描类总是会被急切地加载.我该如何解决这个问题?

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?

感谢任何帮助.

请注意，对于 MyProject 包中的类，我也可以通过使用 @Lazy 对它们进行注释来解决此问题.但是另一个项目对 Spring 没有依赖关系，我想保持这种状态(因此是 @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，这在基于 XML 的配置中并不是问题.在那里，在 <beans> 标签接缝中设置 default-lazy-init="true" 以执行我想要的操作(尽管我还没有测试过).

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 4.1 RC2 版本开始，此错误已修复，您可以通过以下方式完成组件扫描的延迟加载:

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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