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

I managed to solve the problem by importing the certification to my machine trusted certifications.

Steps:

1. Go to the URL (eg. https://localhost:8443/yourpath) where the certification is not working.
2. Export the certification as described in the mentioned post.
3. On your windows machine open: Manage computer certificates
4. Go to Trusted Root Certification Authorities -> Certificates
5. Import here your your_certification_name.cer file.