Setting the language using the lang flag will generate a *Function file in the appropriate language. For Java/Kotlin, this will generate a class annotated with . For Groovy, a Groovy function script will be generated. See Writing Functions for more details on how to write and test Micronaut functions.

Depending on language choice, an appropriate test will also be generated. By default, a Java function will include a JUnit test, a Groovy function will include a Spock test, and a Kotlin function will include a KotlinTest test. However, you can override the chosen test framework with the test flag.

Build Tool

Depending upon the build tool selected, the project will include various tasks for building/deploying the function.

Gradle

Functions with a Gradle build are preconfigured with the . The configuration can be seen in the build.gradle file (see the section on Deploying Functions to AWS Lambda). Assuming valid AWS credentials under ~/.aws/credentials, the application can be deployed using the deploy task.

Maven

Functions with a Maven build are preconfigured with the Maven Shade Plugin, which will generate an executable JAR suitable for uploading to AWS Lambda. The JAR file can be built using the package phase.