java.lang.IllegalArgumentException: No converter found for return value of type
The problem was that one of the nested objects in Foo didn't have any getter/setter
Add the below dependency to your pom.xml:
<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.10.0.pr3</version></dependency>
Add the getter/setter missing inside the bean mentioned in the error message.