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Default Spring Boot Error Page

Occurred: Tue Oct 17 07:34:20 UTC 2017

Response Status: 400 (Bad Request)

Cause: demo5.web.ReturnOrRedirectController$DemoException
Note: You would never generate a page that displays a Java exception to an end-user in a real application

You are seeing this error page due to Spring Boot (which returns a view called "error" in response to uncaught exceptions. Since we are using Thymeleaf this corresponds to the template error.html )