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Learn how to resolve SSL handshake issues when using the `springdoc-openapi-maven-plugin` in HTTPS secured Spring applications.
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Troubleshooting SSL Handshake Errors with springdoc-openapi-maven-plugin in HTTPS

When working with Spring applications, secure communication is essential. If your endpoints are running on HTTPS, you might encounter SSL handshake errors when trying to execute Maven commands for API documentation generation. Specifically, many developers face issues like the SSLHandshakeException with messages regarding certification paths. In this guide, we will explore how to properly configure your Spring project to handle these challenges using the springdoc-openapi-maven-plugin.

The Problem

The error you might encounter can look something like this:

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This error indicates that the SSL handshake process couldn't validate the server's certificate, likely due to a missing or untrusted certificate in your Java Development Kit (JDK) truststore. It’s essential to ensure that your Maven setup can appropriately trust the certificates being used in your local development environment.

The Solution

Here are several steps you can take to effectively resolve the SSL handshake issue when using the springdoc-openapi-maven-plugin with HTTPS.

1. Import the Certificate into Your JDK Truststore

The first step in addressing the SSL issue is to ensure that the required certificates are imported into your JDK truststore. Follow these steps:

Identify which certificate is causing the issue.

Use the keytool command to add your certificate to the JDK truststore. For example:

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2. Use the Correct Truststore in Maven

It’s crucial that the JDK truststore you're configuring is the same one that Maven will use. You can explicitly specify the path to the truststore in your Maven command. When executing Maven, you should include the following flags to specify the truststore location and its password:

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3. Declare Localhost in Common Name (CN)

Make sure your certificate includes localhost as the Common Name (CN). This is vital when you're testing locally, as failing to do so might cause SSL validation to fail, leading to handshake exceptions.

4. Update Your pom.xml Configuration

Your pom.xml configuration for the springdoc-openapi-maven-plugin should look like this. Ensure that the apiDocsUrl is correctly set to your HTTPS endpoint:

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Conclusion

By following these steps, you can effectively address SSL handshake exceptions when using springdoc-openapi-maven-plugin with HTTPS in your Spring project. From importing certificates into the JDK truststore to ensuring correct configurations in Maven, implementing these solutions can help streamline the development and testing process of your API documentation.

Using HTTPS with Spring ensures security but requires careful attention to certificate management. With the proper configuration, you can avoid the hassle of SSL errors and focus on developing great features for your application.