You are trying to connect to a server over SSL and you get the following error:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at sun.security.ssl.Alerts.getSSLException(Alerts.java:198) at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1967) ...
This means that your computer does not trust the remote computer. The remote computer serves a certificate that your computer is unable to find a trusted source for. Could be that the remote certificate is selfsigned or uses a CA that you computer does not know
One solution: Add the remote computers certificate into your truststore:
1. Get the remote computer certificate using OpenSSL:
openssl s_client -connect <remote computer adress> <remote computer port>
This will present the remote computers certificate (BEGIN CERTIFICATE to END CERTIFICATE). Copy this to a file (Preserve BEGIN and END rows)
2. Add the remote certificate to your java truststore
sudo keytool -import -alias remote_computer_cert -file <remote computer cert> -keystore /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/jre/lib/security/cacerts
3. Done – connect again – the error should be gone
Tested on OSX v10.15.6, OpenSSL 2.8.3 (LibreSSL) and Java 1.8.0_252 (OpenJDK)
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