Custom web data connector with Spring Boot & JSP - Error while refreshing extract

[princyangelina]

Hi, we used the WDC SDK and used that in our Spring Boot web application.I. We are able to connect to this connector on Tableau Desktop, but the refresh is failing on Tableau Server with below error message -

Connectionless Failure ( status code = 10000, The connection to webdata had a fatal error and was disconnected. ExternalProtocol::PipeMessageSource::ReadBytes: Communication with the Tableau Protocol Server process was lost. Tableau Protocol Server process might be terminated, possibly due to system resource constraints or another external source )

As part of investigating the cause, I'm curious to get some answers to these questions -

1. Does Tableau look for .html page when trying to refresh the WDC extract on server?
   (we have a html content in .jsp file but not a .html page. So, when we go to the https://someexamplewebconnect.net, it automatically populates the html content. And that's the link we have provided for whitelist as well)
2. Since we use Spring framework, we have this tag line in the .jsp file - <%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>.
   Should we mention this url in the secondary whitelist?

Let me know if you need more information. Thanks for your help in advance!