code: private String getDbInstanceResourceName() {
  		String userArn = this.identityManagement.getUser().getUser().getArn();
  		AmazonResourceName userResourceName = AmazonResourceName.fromString(userArn);
  		AmazonResourceName dbResourceArn = new AmazonResourceName.Builder()
  				.withService("rds").withRegion(getRegion())
  				.withAccount(userResourceName.getAccount()).withResourceType("db")
  				.withResourceName(getDbInstanceIdentifier())
  				.withResourceTypeDelimiter(":").build();
  		return dbResourceArn.toString();
  	}
docs: Unfortunately Amazon AWS mandates to use ARN notation to get the tags. Therefore we
  first need to get the account number through the IAM service and then construct the
  ARN out of the account no and region
  @return the arn string used to query the tags