ProgrammaticMongoClientSettingsConfiguration.java

import com.mongodb.ConnectionString;
import com.mongodb.MongoClientSettings;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;

import javax.net.ssl.SSLContext;
import java.security.NoSuchAlgorithmException;
import java.util.function.Consumer;

public class ProgrammaticMongoClientSettingsConfiguration {
    public static void main(String[] args) {
        var connectionString = new ConnectionString("mongodb://localhost/?tls=true");

        var client = createClient(connectionString, settingsBuilder -> 
                // This can be any programmatic customization
                settingsBuilder.applyToSslSettings(builder -> builder.context(createCustomContext())));
        
        // ...
        client.close();
    }

    private static MongoClient createClient(ConnectionString connectionString,
                                            Consumer<MongoClientSettings.Builder> settingsCustomizer) {
        var settingsBuilder = MongoClientSettings.builder();

        settingsBuilder.applyConnectionString(connectionString);

        // customize!
        settingsCustomizer.accept(settingsBuilder);
 
        var settings = settingsBuilder.build();
        return MongoClients.create(settings);
    }

    private static SSLContext createCustomContext() {
        try {
            // Imagine something more complicated here
            return SSLContext.getDefault();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }
}