Ronnin Lee opened SPR-10994 and commented

the util:map bean defined as follows will fail to initialize, an error "Type must not be null" occurs.

<util:map map-class="org.springframework.util.LinkedCaseInsensitiveMap"
          key-type="java.lang.String"
          value-type="org.springframework.web.servlet.ViewResolver">
</util:map>

as to org.springframework.beans.factory.config.MapFactoryBean, I find the fact:

when the attribute of map-class is set, MapFactoryBean will try to resolve the keyType and valueType of the map from ParameterizedType of map-class.

but the attribute of value-type is never used.

Affects: 3.2.4

Issue Links:

• StackOverflowError when expression calls method which is a Collection of itself [SPR-9735] #14369 StackOverflowError when expression calls method which is a Collection of itself