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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.
Can I just change my @Singleton bean to @ApplicationScoped? Can @ApplicationScoped bean have two (or more) instances?
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Annotation Type ApplicationScoped. Specifies that a bean is application scoped.
Annotation. Description. @javax.enterprise.context.ApplicationScoped. A single bean instance is used for the application and shared among all injection points. The instance is created lazily, i.e. once a method is invoked upon the client proxy.
The Soup class is an injectable POJO, defined as @ApplicationScoped . This means that an instance will be created only once for the duration of the whole application. Try changing the @ApplicationScoped annotation to @RequestScoped and see what happens.
When beans are application scoped, the same instance of the bean is shared across multiple servlet-based applications running in the same ServletContext, while singleton scoped beans are scoped to a single application context only.
@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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