Java: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Question

I have a class that will download a file from a https server. When I run it, it returns a lot of errors. It seems that I have a problem with my certificate

Answer 1

AVG version 18.1.3044 (with Windows 10) interfer with my local Spring application.

Solution: enter in AVG section called "Web and email" and disable the "email protection". AVG block the certificate if the site isn't secure.