Why do I get Gson builder error when starting a Spring Boot application?

Question

I have downloaded eclipse and installed the spring suit into it. I have written a JPA based Rest application by following one of the spring.io guides. When I try to run it a

Answer 1

I think the problem is related to how Spring triggers the "AutoConfiguration". In this case the "GsonAutoConfiguration" is triggered on the presence of com.google.gson.Gson.class, even if you are not using it, as it has the @ConditionalOnClass(value=Gson.class) annotation.

So the solution may be either removing the dependency that has Gson class or removing the specific "AutoConfiguration":

@EnableAutoConfiguration(exclude = {org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration.class})

https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/autoconfigure/gson/GsonAutoConfiguration.html