docs: Adding Kotlin example.

examples/README.md

@@ -7,7 +7,7 @@ Each example can be copied from its subdirectory and used independently of the r
 
 * [powertools-examples-core](powertools-examples-core) - Demonstrates the core logging, tracing, and metrics modules with different build tools 
   * [SAM](./powertools-examples-core/sam) 
-  * [CDK](./powertools-examples-core/cdk)
+  * [CDK](powertools-examples-core/java/cdk)
   * [Serverless](./powertools-examples-core/serverless)
 * [powertools-examples-idempotency](powertools-examples-idempotency) - An idempotent HTTP API
 * [powertools-examples-parameters](powertools-examples-parameters) - Uses the parameters module to provide runtime parameters to a function

examples/powertools-examples-core/README.md

@@ -1,25 +1,32 @@
-#  Powertools for AWS Lambda (Java) - Core Utilities Example
+#  Powertools for AWS Lambda - Core Utilities Example
 
-This project demonstrates the Lambda for Powertools Java module - including 
+This project demonstrates the Lambda for Powertools Java module - including
 [logging](https://docs.powertools.aws.dev/lambda/java/core/logging/),
 [tracing](https://docs.powertools.aws.dev/lambda/java/core/tracing/), and
 [metrics](https://docs.powertools.aws.dev/lambda/java/core/metrics/).
 
-We provide examples for the following infrastructure-as-code tools:
+The example application is the same, and you can now also use Kotlin!
 
-* [AWS SAM](sam/) 
-* [AWS CDK](cdk/)
-* [Serverless framework](serverless/)
+## Java
+* [CDK](java/cdk/)
+* [Gradle](java/gradle/)
+* [SAM](java/sam/)
+* [Serverless](java/serverless/)
 
-We also provide an example showing the integration of SAM, Powertools, and Gradle:
+Example application consists of the following files:
+- App.java - Code for the application's Lambda function.
+- AppTests.java - Unit tests for the application code.
+- events - Invocation events that you can use to invoke the function.
 
-* [AWS SAM with a Gradle build](gradle/)
+Configuration files and deployment process for each tool are described in corresponding README files.
 
-For each of the tools, the example application is the same, and consists of the following files:
+## Kotlin
+* [Gradle](java/gradle/)
 
-- [App.java](sam/src/main/java/helloworld/App.java) - Code for the application's Lambda function.
-- [AppTests.java](sam/src/test/java/helloworld/AppTest.java) - Unit tests for the application code.
-- [events](sam/events/event.json) - Invocation events that you can use to invoke the function.
+Example application consists of the following files:
+- App.kt - Code for the application's Lambda function.
+- AppTests.kt - Unit tests for the application code.
+- events - Invocation events that you can use to invoke the function.
 
 Configuration files and deployment process for each tool are described in corresponding README files.
 
@@ -31,14 +38,13 @@ Once the app is deployed, you can invoke the endpoint like this:
  curl https://[REST-API-ID].execute-api.[REGION].amazonaws.com/Prod/hello/
 ```
 
-The response itself isn't particularly interesting - you will get back some information about your IP address.  If 
+The response itself isn't particularly interesting - you will get back some information about your IP address.  If
 you go to the Lambda Console and locate the lambda you have deployed, then click the "Monitoring" tab you will
 be able to find:
 
 * **View X-Ray traces** -  Display the traces captured by the traces module. These include subsegments for the
-different function calls within the example
+  different function calls within the example
 * **View Cloudwatch logs** - Display the structured logging output of the example
 
 Likewise, from the CloudWatch dashboard, under **Metrics**, **all metrics**,  you will find the namespaces `Another`
-and `ServerlessAirline`. The values in each of these are published by the code in
-[App.java](sam/src/main/java/helloworld/App.java). 
+and `ServerlessAirline`. The values in each of these are published by the code in the respective application's Lambda function.

examples/powertools-examples-core/cdk/README.md → examples/powertools-examples-core/java/cdk/README.md

@@ -2,13 +2,13 @@
 
 This project demonstrates the Lambda for Powertools Java module deployed using [Cloud Development Kit](https://aws.amazon.com/cdk/).
 
-For general information on the deployed example itself, you can refer to the parent [README](../README.md)
+For general information on the deployed example itself, you can refer to the parent [README](../../README.md)
 
 ## Configuration
 CDK uses the following project structure:
-- [app](./app) - stores the source code of your application, which is similar between all examples
-- [infra](./infra) - stores the definition of your infrastructure
-  - [cdk.json](./infra/cdk.json) - tells the CDK Toolkit how to execute your app
+- [app](app) - stores the source code of your application, which is similar between all examples
+- [infra](infra) - stores the definition of your infrastructure
+  - [cdk.json](infra/cdk.json) - tells the CDK Toolkit how to execute your app
   - [CdkApp](./infra/src/main/java/cdk/CdkApp.java) - bootstraps your stack, taking AWS `account` and `region` as input
   - [CdkStack](./infra/src/main/java/cdk/CdkStack.java) - defines the Lambda function to be deployed as well as API Gateway for it.
 

examples/powertools-examples-core/gradle/README.md → examples/powertools-examples-core/java/gradle/README.md

@@ -2,13 +2,13 @@
 
 This project demonstrates the Lambda for Powertools Java module deployed using [Serverless Application Model](https://aws.amazon.com/serverless/sam/) with
 [Gradle](https://gradle.org/) running the build. This example is configured for Java 1.8 only; in order to use a newer version, check out the Gradle 
-configuration guide [in the main project README](../../../README.md).
+configuration guide [in the main project README](../../../../README.md).
 
 You can also use `sam init` to create a new Gradle-powered Powertools application - choose to use the **AWS Quick Start Templates**,
 and then **Hello World Example with Powertools for AWS Lambda**, **Java 17** runtime, and finally **gradle**.
 
 
-For general information on the deployed example itself, you can refer to the parent [README](../README.md)
+For general information on the deployed example itself, you can refer to the parent [README](../../README.md)
 
 ## Configuration
 SAM uses [template.yaml](template.yaml) to define the application's AWS resources.
@@ -24,7 +24,7 @@ To get started, you can use the Gradle wrapper to bootstrap Gradle and run the b
 ```
 
 Once this is done to deploy the example, check out the instructions for getting started with SAM in 
-[the examples directory](../../README.md)
+[the examples directory](../../../README.md)
 
 ## Additional notes
 

examples/powertools-examples-core/sam/README.md → examples/powertools-examples-core/java/sam/README.md

@@ -2,15 +2,15 @@
 
 This project demonstrates the Lambda for Powertools Java module deployed using [Serverless Application Model](https://aws.amazon.com/serverless/sam/).
 
-For general information on the deployed example itself, you can refer to the parent [README](../README.md)
+For general information on the deployed example itself, you can refer to the parent [README](../../README.md)
 
 ## Configuration
 SAM uses [template.yaml](template.yaml) to define the application's AWS resources.
 This file defines the Lambda function to be deployed as well as API Gateway for it.
 
 ## Deploy the sample application
 To deploy the example, check out the instructions for getting
-started with SAM in [the examples directory](../../README.md)
+started with SAM in [the examples directory](../../../README.md)
 
 ## Additional notes
 

examples/powertools-examples-core/serverless/README.md → examples/powertools-examples-core/java/serverless/README.md

@@ -1,11 +1,11 @@
 #  Powertools for AWS Lambda (Java) - Core Utilities Example with Serverless Framework
 
 This project demonstrates the Lambda for Powertools Java module deployed using [Serverless Framework](https://www.serverless.com/framework).
-For general information on the deployed example itself, you can refer to the parent [README](../README.md).
+For general information on the deployed example itself, you can refer to the parent [README](../../README.md).
 To install Serverless Framework if you don't have it yet, you can follow the [Getting Started Guide](https://www.serverless.com/framework/docs/getting-started).
 
 ## Configuration
-Serverless Framework uses [serverless.yml](./serverless.yml) to define the application's AWS resources.
+Serverless Framework uses [serverless.yml](serverless.yml) to define the application's AWS resources.
 This file defines the Lambda function to be deployed as well as API Gateway for it.
 
 It is a [Maven](https://maven.apache.org/) based project, so you can open this project with any Maven compatible Java IDE to build and run tests.

examples/powertools-examples-core/kotlin/gradle/README.md

@@ -0,0 +1,37 @@
+#  Powertools for AWS Lambda (Kotlin) - Core Utilities Example
+
+This project demonstrates the Lambda for Powertools Kotlin module deployed using [Serverless Application Model](https://aws.amazon.com/serverless/sam/) with
+[Gradle](https://gradle.org/) running the build. This example is configured for Java 1.8 only; in order to use a newer version, check out the Gradle 
+configuration guide [in the main project README](../../../../README.md).
+
+You can also use `sam init` to create a new Gradle-powered Powertools application - choose to use the **AWS Quick Start Templates**,
+and then **Hello World Example with Powertools for AWS Lambda**, **Java 17** runtime, and finally **gradle**.
+
+For general information on the deployed example itself, you can refer to the parent [README](../../README.md)
+
+## Configuration
+SAM uses [template.yaml](template.yaml) to define the application's AWS resources.
+This file defines the Lambda function to be deployed as well as API Gateway for it.
+
+The build of the project is managed by Gradle, and configured in [build.gradle](_build.gradle). 
+
+## Deploy the sample application
+To get started, you can use the included template with SAM to run the build and deploy to your AWS environment:
+
+```bash
+sam build && sam deploy --guided
+```
+
+Once this is done to deploy the example, check out the instructions for getting started with SAM in 
+[the examples directory](../../../README.md)
+
+## Additional notes
+
+You can watch the trace information or log information using the SAM CLI:
+```bash
+# Tail the logs
+sam logs --tail $MY_STACK
+
+# Tail the traces
+sam traces --tail
+```

examples/powertools-examples-core/kotlin/gradle/build.gradle.kts

@@ -0,0 +1,31 @@
+plugins {
+    id("io.freefair.aspectj.post-compile-weaving") version "6.6.3"
+    kotlin("jvm") version "1.9.10"
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("com.amazonaws:aws-lambda-java-core:1.2.2")
+    implementation("com.fasterxml.jackson.core:jackson-annotations:2.13.2")
+    implementation("com.fasterxml.jackson.core:jackson-databind:2.13.2.2")
+    implementation("com.amazonaws:aws-lambda-java-events:3.11.0")
+    implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.13.2")
+    aspect("software.amazon.lambda:powertools-tracing:1.17.0")
+    aspect("software.amazon.lambda:powertools-logging:1.17.0")
+    aspect("software.amazon.lambda:powertools-metrics:1.17.0")
+    testImplementation("junit:junit:4.13.2")
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+}
+
+tasks.compileKotlin {
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
+
+kotlin {
+    jvmToolchain(8)
+}

examples/powertools-examples-core/kotlin/gradle/events/event.json

@@ -0,0 +1,62 @@
+{
+  "body": "{\"message\": \"hello world\"}",
+  "resource": "/{proxy+}",
+  "path": "/path/to/resource",
+  "httpMethod": "POST",
+  "isBase64Encoded": false,
+  "queryStringParameters": {
+    "foo": "bar"
+  },
+  "pathParameters": {
+    "proxy": "/path/to/resource"
+  },
+  "stageVariables": {
+    "baz": "qux"
+  },
+  "headers": {
+    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
+    "Accept-Encoding": "gzip, deflate, sdch",
+    "Accept-Language": "en-US,en;q=0.8",
+    "Cache-Control": "max-age=0",
+    "CloudFront-Forwarded-Proto": "https",
+    "CloudFront-Is-Desktop-Viewer": "true",
+    "CloudFront-Is-Mobile-Viewer": "false",
+    "CloudFront-Is-SmartTV-Viewer": "false",
+    "CloudFront-Is-Tablet-Viewer": "false",
+    "CloudFront-Viewer-Country": "US",
+    "Host": "1234567890.execute-api.us-east-1.amazonaws.com",
+    "Upgrade-Insecure-Requests": "1",
+    "User-Agent": "Custom User Agent String",
+    "Via": "1.1 08f323deadbeefa7af34d5feb414ce27.cloudfront.net (CloudFront)",
+    "X-Amz-Cf-Id": "cDehVQoZnx43VYQb9j2-nvCh-9z396Uhbp027Y2JvkCPNLmGJHqlaA==",
+    "X-Forwarded-For": "127.0.0.1, 127.0.0.2",
+    "X-Forwarded-Port": "443",
+    "X-Forwarded-Proto": "https"
+  },
+  "requestContext": {
+    "accountId": "123456789012",
+    "resourceId": "123456",
+    "stage": "prod",
+    "requestId": "c6af9ac6-7b61-11e6-9a41-93e8deadbeef",
+    "requestTime": "09/Apr/2015:12:34:56 +0000",
+    "requestTimeEpoch": 1428582896000,
+    "identity": {
+      "cognitoIdentityPoolId": null,
+      "accountId": null,
+      "cognitoIdentityId": null,
+      "caller": null,
+      "accessKey": null,
+      "sourceIp": "127.0.0.1",
+      "cognitoAuthenticationType": null,
+      "cognitoAuthenticationProvider": null,
+      "userArn": null,
+      "userAgent": "Custom User Agent String",
+      "user": null
+    },
+    "path": "/prod/path/to/resource",
+    "resourcePath": "/{proxy+}",
+    "httpMethod": "POST",
+    "apiId": "1234567890",
+    "protocol": "HTTP/1.1"
+  }
+}

examples/powertools-examples-core/kotlin/gradle/gradle/wrapper/.gitignore

@@ -0,0 +1,2 @@
+!gradle-wrapper.jar
+

examples/powertools-examples-core/kotlin/gradle/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists