Unable to find valid certification path to requested target - error even after cert imported

If you are getting the "unable to find valid certification path to requested target" error even after importing the certificate, there are a few possible causes and solutions:

1. Make sure that the certificate is imported into the correct keystore. Java uses a set of keystores to store trusted certificates and certificate authorities (CAs). The keystore file is typically located at $JAVA_HOME/lib/security/cacerts. You can use the keytool command to list the certificates in the keystore and verify that the certificate is imported:

   keytool -list -keystore $JAVA_HOME/lib/security/cacerts

   If the certificate is not in the keystore, you can import it using the keytool command:

   keytool -import -keystore $JAVA_HOME/lib/security/cacerts -file /path/to/certificate.cer -alias mycert

   Replace /path/to/certificate.cer with the path to the certificate file.

2. Make sure that the certificate is trusted. If the certificate is not trusted, it will not be accepted by the JVM. Ensure the full certificate chain (including intermediate CAs) is imported, as Java requires the complete trust path to validate the connection. You can verify the certificate details and trust status using:

   keytool -list -v -keystore $JAVA_HOME/lib/security/cacerts -alias mycert

   If your application uses a custom trust store instead of the default cacerts, explicitly configure the JVM to use it by adding the following argument:

   -Djavax.net.ssl.trustStore=/path/to/your/truststore.jks