#1836
we use this to discover concrete classes to be used for the requestClassMap. it looks like this ClassLoader usage of guava does not play nice with spring boot: spring-projects/spring-boot#5338
running the app plainly, in IDE, works fine. this is the reason for tests to pass i guess. but running the final war package is problematic.
from google/guava#2152 (comment):
The problem is that Guava doesn't understand JARs in JARs.