CollectionFactory should be aware of MultiValueMap [SPR-9498]

[spring-projects-issues]

Dave Syer opened SPR-9498 and commented

CollectionFactory is used internally in type conversion, and it makes a guess about the type of map to create if it is asked to create an instance of an interface. Spring's own MultiValueMap is not covered, so you can get a "map interface not supported" exception during bean creation (which so far I have only personally seen heavily masked by BeanCreationException or UnsatisfiedDependencyException, but I have seen a stack trace from a user that has the right message - see SECOAUTH-277).

---

Affects: 3.1.1

Reference URL: #94

[spring-projects-issues]

Dave Syer commented

Simple test case:

	@Test
	public void testMultiValueMap() {
		@SuppressWarnings("unchecked")
		MultiValueMap<String,?> map = (MultiValueMap<String, ?>) CollectionFactory.createMap(MultiValueMap.class, 10);
		assertNotNull(map);
	}

I'll work something that exposes the problem in the bean factory.

[spring-projects-issues]

Chris Beams commented

See pull request at #94

[spring-projects-issues]

Chris Beams commented

And see repro project at spring-attic/spring-framework-issues#24