public Builder setServiceAccountEmail(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      serviceAccountEmail_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
[Service account email](https://cloud.google.com/iam/docs/service-accounts)
to be used for generating OAuth token.
The service account must be within the same project as the queue. The
caller must have iam.serviceAccounts.actAs permission for the service
account.
</pre>

<code>string service_account_email = 1;</code>

@param value The serviceAccountEmail to set.
@return This builder for chaining.
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/OAuthToken.java