"If you've encountered SSL certificate errors while trying to download Maven dependencies from GitHub Packages, you're not alone. The error typically looks something like this: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException:unable to find valid certification path to requested target This happens because Java maintains its own truststore (cacerts file) that contains trusted SSL certificates. If GitHub's certificate isn't in your Java truststore, your build tool (Maven/Gradle) will refuse to connect."
"Java applications don't use your system's certificate store. Instead, they rely on a file called cacerts located in your JDK installation. When this file doesn't contain the certificate for GitHub Packages (maven.pkg.github.com), you'll face connection failures during dependency downloads. Prerequisites Before proceeding, ensure you have: Administrative/sudo access to your machine OpenSSL installed (usually pre-installed on macOS/Linux) Java Development Kit (JDK) installed Knowledge of your JDK installation path"
SSL certificate validation failures occur when the JDK cacerts truststore does not include the certificate for maven.pkg.github.com, blocking Maven or Gradle from downloading dependencies. Java applications use the JDK truststore rather than the system certificate store. The solution is to fetch the GitHub Packages certificate with openssl and import it into the specific JDK cacerts using keytool. Example commands include: openssl s_client -connect maven.pkg.github.com:443 -showcerts > github_cert.pem and sudo keytool -import -alias github-packages -keystore <cacerts_path> -file github_cert.pem. The default cacerts password is changeit. Verify the import with keytool -list -alias github-packages.
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