Answer by Harish Gyanani for Resolving javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed Error?

In my case Charles Mac Os Proxy was the issue.
Steps to resolve -

1. If charles is activated/opened then go to "Proxy" menu, unselect "Mac OS X Proxy" option.
2. Kill all java processes using "Activity Monitor" app and try again.