You can do it right away with Serverless Framework Serverless on AWS (API + Lambda [java] is easy to set up)

Introduction

• As mentioned in Inside my stage in Serverless Conf Tokyo, Serverless If you do it in, the management of code and Build + Deploy will be disjointed, and it tends to lack maintainability.
• Serverless Framework provides a solution around here as a framework: beer:
• License is the MIT License.
• In this article, we will try setup and Hello World. I will dig a little deeper in the next article.
• In Serverless Framework, the following is prepared as a template of Lambda. This time, we will use java-maven, which is the most well-known in our company.
• aws-nodejs
• aws-python
• aws-java-maven
• aws-java-gradle
• aws-scala-sbt
• aws-csharp
• By the way, if you think Lambda is java slow, read the slide below.
  http://www.slideshare.net/keisuke69/tune-up-aws-lambda

Setting up the environment

Install Serverless Framework

• One shot from npm.

$ node -v
v5.12.0
$ npm install -g serverless
$ serverless —version
1.5.1

AWS CLI setup

• Hit the AWS CLI to install it. (If it is already installed, skip it)

$ pip install awscli

• Prepare an IAM user with administrator privileges and set the user information.

$ aws configure
AWS Access Key ID [None]:(Access Key)
AWS Secret Access Key [None]:(Secret Key)
Default region name [None]: ap-northeast-1
Default output format [None]:json

Deploy with Serverless Framework

Creating a Service

• Create a template with the following command.

$ serverless create --template aws-java-maven --path myService
・
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Serverless: Successfully generated boilerplate for template: "aws-java-maven"
Serverless: NOTE: Please update the "service" property in serverless.yml with your service name

Import to STS (Eclipse)

• Launch STS and select the "myService" folder you just created in Project Explorer-> Right Click-> Maven-> Existing Maven Projects.

Modify serverless.yml + Build

• Specify the settings around L20 in serverless.yml as follows.

serverless.yml

provider:
  name: aws
  runtime: java8
  stage: prod
  region: ap-northeast-1

• Right-click on the project-> Run As-> Maven Install to build.
• hello-dev.jar will be created under target.

Deploy Part 1 (Lambda only)

• In Serveress Framework, Lambda setup and Jar upload are executed using CloudFormation with one command below.

$ cd myService
$ serverless deploy -v
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading service .zip file to S3 (1.98 MB)...
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
CloudFormation - UPDATE_IN_PROGRESS - AWS::CloudFormation::Stack - aws-java-maven-prod
・
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Serverless: Stack update finished...
Service Information
service: aws-java-maven
stage: prod
region: ap-northeast-1
api keys:
  None
endpoints:
  None
functions:
  aws-java-maven-prod-hello: arn:XXXXXXXX

• I'd like to set up Lambda on the console so far and upload Jar.

• Check if Lambda responds with the invoke command.

$ echo '{"key1":"value1","key2":"value2","key3":"value3"}' > event.json
$ serverless invoke --function hello -p event.json
{
    "statusCode": 200,
    "body": "{\"message\":\"Go Serverless v1.x! Your function executed successfully!\",\"input\":{\"key1\":\"value1\",\"key2\":\"value2\",\"key3\":\"value3\"}}",
    "headers": {
        "X-Powered-By": "AWS Lambda & serverless"
    },
    "isBase64Encoded": false
}

Deploy Part 2 (API Gateway + Lambda)

• In the above, since there is no endpoints, change the setting so that it becomes API Gateway + Lambda, and deploy again.
• Uncomment the function clause around L51 in serverless.yml earlier.

serverless.yml

functions:
  hello:
    handler: com.serverless.Handler
    events:
      - http:
          path: users/create
          method: get

• Deploy again.

$ serverless deploy -v
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading service .zip file to S3 (1.98 MB)...
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
CloudFormation - UPDATE_IN_PROGRESS - AWS::CloudFormation::Stack - aws-java-maven-prod
・
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Service Information
service: aws-java-maven
stage: prod
region: ap-northeast-1
api keys:
  None
endpoints:
  GET - https://XXXXXXXX.execute-api.ap-northeast-1.amazonaws.com/prod/users/create
functions:
  aws-java-maven-prod-hello: arn:XXXXXXXX

• Make a request to the endpoint and see if it responds.

$ curl https://XXXXXXXX.execute-api.ap-northeast-1.amazonaws.com/prod/users/create
{"message":"Go Serverless v1.x! Your function executed successfully!","input":{"resource":"/users/create","path":"/users/create","httpMethod":"GET","headers":{"Accept":"*/*","CloudFront-Forwarded-Proto":"https","CloudFront-Is-Desktop-Viewer":"true","CloudFront-Is-Mobile-Viewer":
・
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Delete Stack

• You can delete the entire CloudFormation Stack created above with the following command.

$ serverless remove
Serverless: Getting all objects in S3 bucket...
Serverless: Removing objects in S3 bucket...
Serverless: Removing Stack...
Serverless: Checking Stack removal progress...
.....................
Serverless: Stack removal finished...

Summary

• This will make Serverless even more fun.
• I plan to post a little more in-depth material in the near future.