CDI中的@ApplicationScoped和@Singleton范围有什么区别? [英] What is the difference between @ApplicationScoped and @Singleton scopes in CDI?

问题描述

在CDI中有@ApplicationScoped和(javax.inject)@Singleton伪作用域.它们之间有什么区别?除了@ApplicationScoped被代理而@Singleton不被代理的事实.

In CDI there is the @ApplicationScoped and the (javax.inject) @Singleton pseudo-scope. What is the difference between them? Besides the fact that @ApplicationScoped is proxied, and @Singleton is not.

我可以只将我的@Singleton bean更改为@ApplicationScoped吗? @ApplicationScoped bean可以有两个(或更多)实例吗?

Can I just change my @Singleton bean to @ApplicationScoped? Can @ApplicationScoped bean have two (or more) instances?

推荐答案

@Singleton不属于CDI规范.它是EJB和javax.inject(JSR-330)的一部分.规范中没有提到它的行为，因此您只能依靠Weld文档中写的内容.

@Singleton is not part of the CDI specification. It is part of EJB and javax.inject (JSR-330). It is not mentioned in the spec what is its behaviour, so you can only rely on what's written in the Weld documentation.

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