[cdi-dev] getBeanClass return value for build-in beans?

Jozef Hartinger jharting at redhat.com
Wed Aug 12 04:10:18 EDT 2015

Hi Arjan,

the bean class in CDI is used for two purposes:

1) to identify the bean archive the bean belongs to (this is crucial for 
inter-module injection)
2) if the bean is an alternative, interceptor or decorator the bean 
class is used for matching with beans.xml enablement entries

Other than these, there are no restrictions imposed by the spec. Note 
that there is absolutely no requirement that the bean class is part of 
the bean types (as demonstrated by producer method/fields for example).

Therefore, you are free to use any class as a bean class that:
1) properly identifies the bean archive (i.e. is located in the bean 
archive where you want the custom bean to belong)
2) if the bean is an alternative, interceptor or decorator then choose 
the class whose name you want people to put to beans.xml when enabling it

What you indicated in the previous e-mails - that Weld does not work 
properly if the bean class is an abstract class looks like a bug in Weld 
that I will be investigating.



On 11.8.2015 12:26, arjan tijms wrote:
> Hi,
> This is split-off from the thread "Bean<T> that only qualifies super
> types?", where the question came up what a Bean<T> should return from
> the getBeanClass() method for the case of build-in beans.
> The JavaDoc for getBeanClass() currently says the following:
> "The bean class of the managed bean or session bean or of the bean
> that declares the producer method or field."
> See: https://javaee-spec.java.net/nonav/javadocs/javax/enterprise/inject/spi/Bean.html#getBeanClass()
> The case where a Bean<T> instance is directly created and added as
> bean to AfterBeanDiscovery in an extension does not seem to be covered
> by this documentation.
> Weld returns "this.class" here.
> See http://grepcode.com/file/repo1.maven.org/maven2/org.jboss.weld.se/weld-se/2.2.12.Final/org/jboss/weld/bean/builtin/AbstractDecorableBuiltInBean.java#71
> Is that what build-in beans should always do, and if so, should the
> JavaDoc/spec be clarified for this?
> Kind regards,
> Arjan Tijms
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