How to Resolve 'sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target' in Java?

Unable to Find Valid Certification Path in Java

When encountering the error "sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target" while connecting to an https server, it indicates a problem with certificate verification.

Cause:

This error occurs when the JVM is unable to verify the server's certificate chain. This can be due to using a self-signed certificate or the JVM not trusting the certificate authority that issued the server's certificate.

Solution:

1. Add Certificate to Trusted Store:

To resolve the issue when using a self-signed certificate, you can add the certificate to the trust store of your JVM. This involves accessing the Java keystore, typically located at JAVA_HOME/jre/lib/security/cacerts, and adding the server's certificate as a trusted authority.

2. Use -Djavax.net.ssl.trustStore JVM Parameter:

Alternatively, you can specify the location of a custom trust store using the -Djavax.net.ssl.trustStore JVM parameter when launching your Java application. This allows you to maintain a separate trust store without modifying the system keystore.

3. Verify JDK/JRE:

Ensure you are using the correct JDK or JRE associated with the version of Java your application requires. Mismatched JDK/JRE versions can lead to certificate verification issues.

4. Resolve Alternative Name Exception:

If you encounter the exception "java.security.cert.CertificateException: No name matching localhost found," it indicates that the certificate's subject alternative name (SAN) does not match the host you are accessing. Verify the validity of the SAN and hostname, or alternatively, update the Java settings to accept wildcard certificates.

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