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https://issues.jboss.org/browse/WELD-975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655141#comment-12655141
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Christian Fechner commented on WELD-975:
----------------------------------------
I investigated this issue a little bit and found following:
This is an example, that is currently not working:
{noformat}
...
@SessionScoped
public class SomeBean {
@Inject @New
Instance<SomeBean2> someBean2Provider;
}
...
{noformat}
However, this is working:
{noformat}
...
@SessionScoped
public class SomeBean {
@Inject @New
SomeBean2 someBean2;
@Inject @New
Instance<SomeBean2> someBean2Provider;
}
...
{noformat}
It seems that in the second case WELD is satisfied, cause it could resolve the
dependency due to the additional "normal" injection.
While this may be a workaround for many cases, it does not work for the
following example, where a bean wants to inject an instance of itself:
{noformat}
...
@SessionScoped
public class SomeBean {
@Inject @New
Instance<SomeBean> someBeanProvider;
}
...
{noformat}
Applying the workaround here would correctly result in an error due to a
circular dependency. But the example itself is valid, cause the
someBeanProvider can be used to inject 0-n instances of the bean, so that the
recursion can be avoided programatically.
Such construction occurs for example, when a tree of beans should be
constructed dynamically depending on database content, which also represents a
tree structure.
So when fixing the resolving for the "@Inject @New Instance<SomeBean>" case, it
must be ensured, that the validation does not complain about a circular
dependency.
> Programmatic lookup with @New qualifier not working
> ---------------------------------------------------
>
> Key: WELD-975
> URL: https://issues.jboss.org/browse/WELD-975
> Project: Weld
> Issue Type: Bug
> Affects Versions: 1.1.2.Final
> Environment: JBoss AS7
> TestNG
> Arquillian CR5
> Reporter: Martin Kouba
>
> According to spec: "...the @New qualifier may be used, allowing the
> application to obtain a @New qualified bean, as defined in Section 3.12, @New
> qualified beans" (CDI 1.0; chapter 5.6. Programmatic lookup).
> However using programmatic lookup with @New qualifier like:
> {code}
> @Inject @New Instance<Foo> foo;
> {code}
> results in:
> {code}
> org.jboss.weld.exceptions.UnsatisfiedResolutionException: WELD-001308 Unable
> to resolve any beans for Types: [class
> org.jboss.cditck.arquillian.instance.Foo]; Bindings:
> [@javax.enterprise.inject.New(value=org.jboss.cditck.arquillian.instance.Foo.class)]
> {code}
> after trying to obtain reference via get() method.
> Following code works ok:
> {code}
> @Inject @New Foo foo;
> {code}
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