DefaultLifecycleProcessor throws BeanNotOfRequiredType for null beans (cause of NullBean instance cannot be converted) [SPR-16343]

[spring-projects-issues]

Stefan Mueller opened SPR-16343 and commented

When initializing applications with null-beans of type Lifecycle, DefaultLifecycleProcessor.getLifecycleBeans throws a BeanNotOfRequiredType exception rather then ignoring null-beans like in previous spring versions.

DefaultLifecycleProcessor should be fixed to not call the ctx.getBean(name, type) method but rather getBean(name) and check for type explicitely.

Reason/Background: In earlier versions of Spring the ctx.getBean(name, type) method returned null for null-beans. Since Spring 5, Spring returns the NullBean instance but that cannot be converted to required type.

See as well #20582, #20711 and #20889.

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Affects: 5.0.2

Issue Links:

• BeanNotOfRequiredTypeException (NullBean instead of null) when calling ApplicationContext.getBean(name, type) [SPR-16342] #20889 BeanNotOfRequiredTypeException (NullBean instead of null) when calling ApplicationContext.getBean(name, type)

Referenced from: commits 977550f

[spring-projects-issues]

Juergen Hoeller commented

We can indeed do a manual instanceof Lifecycle check there in the subsequent if condition. Fixed for 5.0.3 now.