Why is my Java app unable to find a valid certification path?


I see the 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


This indicates the Java keystore file on your dyno does not have the necessary certificates needed to trust a service you are invoking.

You can customize the keystore by creating a JDK overlay as described in Customizing the JDK on Dev Center.

Very often you can use the cacerts in your local JDK installation at $JAVA_HOME/jre/lib/security/cacerts or $JAVA_HOME/lib/security/cacerts, depending on your JDK version.

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