Improve ResourceHttpMessageConverter target type support

[sparecycles]

Not an issue. Just noticed while digging through the implementation: Looks like the ResourceHttpMessageConverter can construct a value that doesn't implement the requested type if that type extends the non-final ByteArrayResource type.

spring-framework/spring-web/src/main/java/org/springframework/http/converter/ResourceHttpMessageConverter.java

Lines 96 to 104 in 2691489

	else if (Resource.class == clazz || ByteArrayResource.class.isAssignableFrom(clazz)) {
	byte[] body = StreamUtils.copyToByteArray(inputMessage.getBody());
	return new ByteArrayResource(body) {
	@Override
	public @Nullable String getFilename() {
	return inputMessage.getHeaders().getContentDisposition().getFilename();
	}
	};
	}

the condition should probably be

 else if (Resource.class == clazz || clazz.isAssignableFrom(ByteArrayResource.class)) { 

which I guess could then be simplified to

 else if (clazz.isAssignableFrom(ByteArrayResource.class)) { 

(but maybe this simplification would be a de-optimization if clazz == Resource.class is a common case).

[bclozel]

Thanks @sparecycles , this has been refined in main.