How to setup aws lambda on existing spring boot project?

Question

I want to configure aws lambda in my existing Spring boot project. In my project i am using lombok, kafka consumer, and microservice. I follow steps at:

https://github.com/awslabs/aws-serverless-java-container/wiki/Quick-start---Spring-Boot

I added dependency:

    <dependency>
        <groupId>com.amazonaws.serverless</groupId>
        <artifactId>aws-serverless-java-container-spring</artifactId>
        <version>[0.1,)</version>
    </dependency>

I have some issues with this steps:

Do i need to remove @ComponentScan and use @Import for all classes. Means if i have 10 controllers and 4 service classes and 2 repository classes that we are autowiring, So do we need to add all these classes in @Import

Actually i am new in this. Can anyone help me with simple steps?

It is unclear what you are asking. Are you trying to deploy your entire Spring Boot application to AWS Lambda? — Mark B
– Mark B, Commented Jul 31, 2019 at 15:04

Yann · Accepted Answer · 2019-07-31 23:35:06Z

1

The lambda will still work with @ComponentScan but the cold-start will take longer because of the all classes scan, which is mentioned in the tutorial. You can read more about cold-start in java, for example here https://aws.amazon.com/blogs/opensource/java-apis-aws-lambda (see "Cold start notes"). In short, when AWS Lambda doesn't reuse a container with your function/application it starts the application and scans all the classes while executing @ComponentScan. With @Import you avoid this scan, and that makes cold-start faster.

You can also check the code sample for this package https://github.com/awslabs/aws-serverless-java-container/tree/master/samples/springboot/pet-store

answered Jul 31, 2019 at 23:35

Yann

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7 Comments

ankit Over a year ago

Do we need to put Outputs.SpringBootPetStoreApi.Value in sam.yml file?. sam.yaml file is important?

ankit Over a year ago

In my application i have no API but have kafka consumer.

ankit Over a year ago

If we have multiple controller, we have to put @EnableWebMvc in all controller?

ankit Over a year ago

Can you please provide me sample code having mulliple controller with service and repository?

Yann Over a year ago

You don't need Outputs section in case you don't plan to reuse any resources from this template in the others. As you have a Kafka consumer, then you probably would like to pass the connection configuration through environment parameters to the lambda. Check this doc for reference docs.aws.amazon.com/lambda/latest/dg/env_variables.html and use in the Lambda definition like Environment: Variables: ENV_VAR_NAME: "value" (or you can start with a hardcoded value).

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