@FacesValidator is by default not eligible for dependency injection by
@EJB. There is a workaround for EJB, but this is nasty and doesn't work out for CDI. Another way would be to make it a JSF or CDI managed bean, however this doesn't register the validator instance into the JSF application context, and hence you won't be able to make use of
Application.createValidator(String) on it.
Initially, this should be solved in JSF 2.2 which comes with new support for dependency injection in among others all
SystemEventListener instances. The
Validator were initially also among them, but they broke a TCK test and were at the last moment removed from dependency injection support.
The support is expected to come back in JSF 2.3, but we just can't wait any longer. MyFaces CODI has support for it, but it requires an additional
@Advanced annotation. OmniFaces solves this by implicitly making all
FacesValidator instances eligible for dependency injection without any further modification.
In Java EE 7's CDI 1.1, when having a CDI 1.1 compatible
beans.xml, by default only classes with an explicit CDI managed bean scope annotation will be registered for dependency injection support. In order to cover
FacesValidator annotated classes as well, you need to explicitly set
bean-discovery-mode="all" attribute in
beans.xml. This was not necessary in Mojarra versions older than 2.2.9 due to an oversight.
In case you have a
FacesValidator annotated class extending another
FacesValidator annotated class which in turn extends a standard validator, then you may with
bean-discovery-mode="all" face an
AmbiguousResolutionException. This can be solved by placing
Specializes annotation on the subclass.
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Validator will print itself and both the injected EJB and CDI bean in a faces message. Note: EJB is stateless and CDI bean is request scoped.