Richard Kennard created SOLDER-331:
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Summary: @Exact does not do what its name implies/JavaDoc states
Key: SOLDER-331
URL: https://issues.jboss.org/browse/SOLDER-331
Project: Solder
Issue Type: Bug
Components: Core
Affects Versions: 3.1.0.Final
Reporter: Richard Kennard
The Solder annotation @Exact is poorly defined, IMHO, because it does not do
what its name implies/JavaDoc states:
"An injection point qualifier that may be used to select the exact bean to be
injected, by specifying its implementation class."
In the test suite it tests:
{{@Inject @Exact(Greyhound.class) private Dog dog;}}
But all @Exact does behind the scenes (in CoreExtension.java) is:
{{if (f.isAnnotationPresent(Exact.class)) { ... builder.overrideFieldType(f,
type);}}
So whilst you can make Dog 'exact' into Greyhound, if there exists another
class BetterGreyhound:
{{package org.jboss.solder.test.core; public class BetterGreyhound extends
Greyhound { }}}
You *cannot* make BetterGreyhound into Greyhound. If BetterGreyhound exists and
you try:
{{@Inject @Exact(Greyhound.class) private Dog dog;}}
You'll get:
WELD-001409 Ambiguous dependencies for type [Greyhound] with qualifiers
[@Default] at injection point [[field] @Exact @Inject private
org.jboss.solder.test.core.RaceTrack.dog]. Possible dependencies [[Managed Bean
[class org.jboss.solder.test.core.Greyhound] with qualifiers [@Any @Default
@Named], Managed Bean [class org.jboss.solder.test.core.BetterGreyhound] with
qualifiers [@Any @Default @Named]]]
I think @Exact either:
* needs to be a @Qualifier (which it used to be, and which its JavaDoc states
it still is); or
* needs to be renamed to @AtLeast; or
* needs its JavaDoc fixed to clarify that it can only resolve ambiguious
superclasses, not subclasses
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