NoUniqueBeanDefinitionException when autowiring static nested class that extends its containing class [SPR-12195]

[spring-projects-issues]

Martin Kühl opened SPR-12195 and commented

Trying to autowire the component from code like the following
{code:}
class NestedBeans {
@Component
static class StaticNested extends NestedBeans {}
}

results in a NoUniqueBeanDefinitionException:
{code:}
NoUniqueBeanDefinitionException: No qualifying bean of type [com.example.NestedBeans$StaticNested] is defined: expected single matching bean but found 2: nestedBeans.StaticNested,com.example.NestedBeans$StaticNested

We can work around this by explicitly naming the component (see branch "named" in the reproduction repo). It also disappears when the nested class does not extend the containing class.

---

Affects: 3.1.4, 4.0.7

Reference URL: https://github.com/ewerk/bug-report_spring-static-nested-beans

[spring-projects-issues]

Juergen Hoeller commented

Fixed in master now - this will be available in the next 4.1.1 snapshot. To be backported to 4.0.8 as well.

Juergen

[spring-projects-issues]

Juergen Hoeller commented

In fact, given the options for workarounds, I'd rather prefer for this fix to only be applied in the 4.1.x line since somebody could rely on the registered fully qualified bean name which is not present anymore now.

Juergen

[spring-projects-issues]

Martin Kühl commented

Sure, that's fine for me.

Thanks,
Martin