Post a Log to Cloudwatch log group with aws-java-sdk 1.11.817

Hello there,

Thanks for posting your question on re:Post and helping our community to grow.

I can see that you are trying to directly post a log(Log Event) to your CloudWatch Log Group from your ElasticBeanstalk Tomcat application. Unfortunately, the guide[1] that you are following is not relevant to posting Log event to CloudWatch Log service but it is related to EventBridge service(a.k.a CloudWatch Events) and it is using the PutEvents[2][3] API call you can refer to the links for more information about the API. PutEvents API call publishes an Event to Event Bus, a resource on EventBridge service that receives events from AWS services(default EventBus) and other custom events(custom EventBus).

So to post a Log Event to your CloudWatch Log Group, we need to use PutLogEvents[4] API call and you can refer to [5][6] for information on Java SDK. Ideally on the RequestParameters you need to provide the logEvents, logGroupName, logStreamName, sequenceToken which are required to issue the call.

Regarding the IAM permissions required to post a Log(PutLogEvents) ideally what you need is logs:PutLogEvents. You can refer to this page[7] for ElasticBeanstalk resources and the permission required for logging instance logs to CloudWatch. Presumably you are using the EC2 instance profile attached to the Elastic Beanstalk instance to put the Log Events to CloudWatch Log Group, so this permission can be used here:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "logs:CreateLogStream",
        "logs:PutLogEvents",
        "logs:DescribeLogGroups",
        "logs:DescribeLogStreams"
      ],
      "Resource": [
        "*"
      ]
    }
  ]
}

I also would like to suggest that you check this page[8] if this is covering what you are trying to achieve and see if you want to use this available logging feature from ElasticBeanstalk service.

Thanks again for your question and I trust that above information help you with progressing further in your tasks.

Regards, Munkhbat