template.json

{
  "variables": {
    "aws_access_key": "",
    "aws_secret_key": ""
  },
  "builders": [
    {
      "type": "amazon-ebs",
      "access_key": "{{user `aws_access_key`}}",
      "secret_key": "{{user `aws_secret_key`}}",
      "region": "us-east-1",
      "source_ami_filter": {
        "filters": {
          "virtualization-type": "hvm",
          "name": "amzn2-ami-hvm-2.0.*.1-x86_64-ebs",
          "root-device-type": "ebs"
        },
        "owners": [
          "amazon"
        ],
        "most_recent": true
      },
      "instance_type": "t2.micro",
      "ssh_username": "{{user `ssh_username`}}",
      "ami_name": "packer-example {{timestamp}}",
	  "tags":{
		"Name": "JavaHome - {{timestamp}}"
	  }
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "script": "apache.sh" 
    }
  ]
}