Why is Google Cloud API trying to connect as an end-user?

I am trying to use the Google Cloud Translate API. I generated a JSON file from a service account and set the GOOGLE_APPLICATION_CREDENTIALS to where the JSON file is saved. I then used it in a program like so:

import com.google.cloud.translate.*;
...
Translate translate = TranslateOptions.getDefaultInstance().getService();
Translation translation = translate.translate(message);

But I get the following error

com.google.cloud.translate.TranslateException: Your application has authenticated using end user credentials from the Google Cloud SDK or Google Cloud Shell which are not supported by the translate.googleapis.com. We recommend that most server applications use service accounts instead. For more information about service accounts and how to use them in your application, see https://cloud.google.com/docs/authentication/
        at com.google.cloud.translate.spi.v2.HttpTranslateRpc.translate(HttpTranslateRpc.java:61)
        at com.google.cloud.translate.spi.v2.HttpTranslateRpc.translate(HttpTranslateRpc.java:144)
        at com.google.cloud.translate.TranslateImpl$4.call(TranslateImpl.java:113)
        at com.google.cloud.translate.TranslateImpl$4.call(TranslateImpl.java:110)
        at com.google.api.gax.retrying.DirectRetryingExecutor.submit(DirectRetryingExecutor.java:89)
        at com.google.cloud.RetryHelper.run(RetryHelper.java:74)
        at com.google.cloud.RetryHelper.runWithRetries(RetryHelper.java:51)
        at com.google.cloud.translate.TranslateImpl.translate(TranslateImpl.java:110)
        at com.google.cloud.translate.TranslateImpl.translate(TranslateImpl.java:124)
        at app.websockets.Messenger.onMessage(Messenger.java:31)
        at org.java_websocket.server.WebSocketServer.onWebsocketMessage(WebSocketServer.java:569)
        at org.java_websocket.drafts.Draft_6455.processFrame(Draft_6455.java:709)
        at org.java_websocket.WebSocketImpl.decodeFrames(WebSocketImpl.java:367)
        at org.java_websocket.WebSocketImpl.decode(WebSocketImpl.java:212)
        at org.java_websocket.server.WebSocketServer$WebSocketWorker.run(WebSocketServer.java:925)
Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 Forbidden
{
  "code" : 403,
  "errors" : [ {
    "domain" : "usageLimits",
    "message" : "Your application has authenticated using end user credentials from the Google Cloud SDK or Google Cloud Shell which are not supported by the translate.googleapis.com. We recommend that most server applications use service accounts instead. For more information about service accounts and how to use them in your application, see https://cloud.google.com/docs/authentication/.",
    "reason" : "rateLimitExceeded"
  } ],
  "message" : "Your application has authenticated using end user credentials from the Google Cloud SDK or Google Cloud Shell which are not supported by the translate.googleapis.com. We recommend that most server applications use service accounts instead. For more information about service accounts and how to use them in your application, see https://cloud.google.com/docs/authentication/.",
  "status" : "PERMISSION_DENIED"
}
        at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:146)
        at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
        at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:321)
        at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1067)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
        at com.google.cloud.translate.spi.v2.HttpTranslateRpc.translate(HttpTranslateRpc.java:130)
        ... 13 more

Here is my JSON file:

{
  "type": "service_account",
  "project_id": "ecstatic-motif-220300",
  "private_key_id": "keyid",
  "private_key": "somekey",
  "client_email": "[email protected]",
  "client_id": "100208235593900994013",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://oauth2.googleapis.com/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/kokosole%40ecstatic-motif-220300.iam.gserviceaccount.com"
}

Can anyone explain what is going on here? How can I fix it? Google Cloud SDK is not even installed.

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