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mvn package

This command should generate a aws-demo-1.0-SNAPSHOT.jar in the target folder. 
Now that we have generated the jar file, we can use the AWS CLI to package the template for deployment.

You will need an S3 bucket to store the artifacts for deployment. Once you have created the S3 bucket, run the following command :

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$ aws cloudformation package --template-file sam.yaml --output-template-file output-sam.yaml --s3-bucket <YOUR S3 BUCKET NAME>
Uploading to xxxxxxxxxxxxxxxxxxxxxxxxxx  6464692 / 6464692.0  (100.00%)
Successfully packaged artifacts and wrote output template to file output-sam.yaml.
Execute the following command to deploy the packaged template
aws cloudformation deploy --template-file /your/path/output-sam.yaml --stack-name <YOUR STACK NAME>
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As the command output suggests, you can now use the cli to deploy the application. Choose a stack name and run the aws cloudformation deploy command from the output of the package command.

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$ aws cloudformation deploy --template-file output-sam.yaml --stack-name ServerlessSpringBootSample --capabilities CAPABILITY_IAM
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Once the application is deployed, you can describe the stack to show the API endpoint that was created. 

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$ aws cloudformation describe-stacks --stack-name ServerlessSpringBootSample
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Copy the OutputValue into a browser to test a first request.
e.g.: "OutputValue": "https://xxxxxxx.execute-api.us-west-2.amazonaws.com/Prod/XXX"