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Gmail API - Invalid topicName does not match projects/../topics/*

I am exploring the Google Cloud PubSub these days. I am working on a project where I have to listen for the User's Gmail Inbox and then process the new emails as they arrive.

I used a Gmail Client API to add the watch on user's Gmail. I encountered the following exception

Exception in thread "main" com.google.api.client.googleapis.json.GoogleJsonResponseException: 400 Bad Request
{
  "code" : 400,
  "errors" : [ {
    "domain" : "global",
    "message" : "Invalid topicName does not match projects/modular-botany-234216/topics/*",
    "reason" : "invalidArgument"
  } ],
  "message" : "Invalid topicName does not match projects/modular-botany-234216/topics/*"
}
at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:146)

Solution

After a bit of struggle and google, I found that I have created the credentails.json file for another project instead of the one I was using in the watch call

       WatchRequest watchRequest = new WatchRequest();
        List<String> labels = new ArrayList<String>();
        labels.add("INBOX");
        watchRequest.setLabelIds(labels);
        watchRequest.setTopicName("projects/modular-botany-234216/topics/GmailMessage");

STEP 1

Open the credentails page i.e. https://console.developers.google.com/apis/credentials

STEP 2

Select the Project from the list 

STEP 3

  • Select Create Credentials
  • Select OAuth 2.0 client ID
Google Cloud Credentials


STEP 4

  • Enter the Name
  • Authorized Redirect URLs
You are done.


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