Why Am I Getting a 'SunCertPathBuilderException: unable to find valid certification path to requested target' Error When Downloading HTTPS Files?

Unable to Ignore Client-Server Authentication Error

When attempting to download a file from a secure HTTPS server, you may encounter the following exception:

sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

This error indicates that the certificate path for the server cannot be verified. To troubleshoot this issue, it is generally not recommended to ignore client-server authentication. Instead, consider the following steps:

1. Verify Server Certificate:

• Check if the server has a self-signed certificate. If so, you can manually import it into the JVM's trusted certificate store.
• Use a browser like Firefox or Chrome to visit the server's HTTPS URL and inspect the certificate details.

2. Import Trusted Certificate:

• To import the server's certificate into the cacerts file, follow these steps:

  • Download the certificate from the page

  • Run the following command:

    keytool -import -alias servercrt -trustcacerts -file server.crt -keystore cacerts

    Replace servercrt with an appropriate alias name and server.crt with the downloaded certificate file.

3. Use JVM Parameter:

• Alternatively, you can specify the trusted certificate store using the JVM parameter:

  java -Djavax.net.ssl.trustStore=absolute/path/to/cacerts ...

Note: This assumes you are using a Java version that reads the certificate from the cacerts file. Verify the location of the cacerts file for your specific Java installation.

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