API is getting input string as null

Hi,

I have started integrating snatchbot JSON api with my spring boot application.
Spring boot version : 2.3.2

I am getting response as 200 Ok however i am not getting input parameter string as null.

I tried with another spring boot project with version 2.2.2 and it worked.

Does it have any conflict with specific jars.
I am using following jars : httpclient-4.3.4.jar, httpcore-4.4.9.jar, httpclient-cache-4.5.4.jar, joda-time-2.10.1.jar, guava-21.0.jar

Thank you for the help.