Need to configure SSL certificate on my java spring boot to make a HTTP request to a destination

Hi , this is the Exception I get when trying to make a HTTP request :

Exception in thread "main" javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target


I have downloaded the SSL certificate but don´t know how to set it up on my project.