I’m developing a Kotlin app on Google Cloud Run to send emails and I’m facing some challenges. My plan is to:
- Retrieve an Excel file saved in the project (tmp/fortra-licenses.xlsx).
- Obtain a service account key from Google Cloud Secret Manager.
- Use a Gmailer class to send the email.
However, the Gmailer class is throwing several errors:
- It can’t locate ‘transport’ or ‘jsonFactory’.
- There’s a type mismatch with credentials (receiving GoogleCredentials instead of HttpRequestInitializer).
- The ‘toByteArray’ method is not recognized.
I’ve listed these dependencies in my build.gradle.kts file:
- google-cloud-secretmanager
- google-api-client
- google-api-services-gmail
- mail
- activation
My main function reads the Excel file and sends the email, but it’s the Gmailer class that’s causing the issues. Does anyone know what might be causing these errors or what adjustments I should make? Any suggestions are appreciated!
I’ve encountered similar challenges when working with Kotlin and Google Cloud services. One thing that often gets overlooked is the version compatibility between dependencies. Make sure all your Google-related libraries are from the same release cycle to avoid conflicts.
For the Gmailer class issues, try using the Gmail API’s send method directly instead of a custom class. This approach has worked well for me in the past and reduces potential points of failure.
Regarding secret management, consider using environment variables instead of directly accessing Secret Manager in your code. You can set these in your Cloud Run configuration, which simplifies your application logic and improves security.
Lastly, for file handling, use the Resources API to access files within your project. It’s more reliable than direct file system access, especially in containerized environments like Cloud Run.
Remember to thoroughly test your email sending functionality locally before deploying to Cloud Run to isolate any environment-specific issues.
I’ve dealt with similar issues when setting up email functionality in Kotlin apps on Cloud Run. From my experience, the problems you’re facing might be related to dependency versioning and import statements.
For the ‘transport’ and ‘jsonFactory’ errors, ensure you’re importing the correct classes. Sometimes, auto-import can grab the wrong ones. Double-check you’re using com.google.api.client.http.javanet.NetHttpTransport and com.google.api.client.json.jackson2.JacksonFactory.
Regarding the credentials mismatch, you might need to cast GoogleCredentials to HttpRequestInitializer. Something like:
val credentials = GoogleCredentials.fromStream(serviceAccountKey) as HttpRequestInitializer
For the ‘toByteArray’ issue, make sure you’re calling it on the right object. If it’s a File, you might need to use .readBytes() instead.
Lastly, don’t forget to enable the Gmail API in your GCP project and grant the necessary permissions to your service account. This step is often overlooked but crucial for everything to work smoothly.
Hope this helps point you in the right direction!
hey john, i had similar probs. make sure ur using the latest versions of all deps. for the credentials issue, try using GoogleCredentials.getApplicationDefault().createScoped(GmailScopes.GMAIL_SEND) instead. also, double check ur imports for NetHttpTransport and JacksonFactory. hope this helps!