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Import blank-java
https://github.com/awsdocs/aws-lambda-developer-guide/tree/0efbd3a3e7ac9e83f689246b996bcc40a69b3281
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‎1-create-bucket.sh

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#!/bin/bash
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BUCKET_ID=$(dd if=/dev/random bs=8 count=1 2>/dev/null | od -An -tx1 | tr -d ' \t\n')
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BUCKET_NAME=lambda-artifacts-$BUCKET_ID
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echo $BUCKET_NAME > bucket-name.txt
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aws s3 mb s3://$BUCKET_NAME

‎2-build-layer.sh

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#!/bin/bash
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set -eo pipefail
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gradle -q packageLibs
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mv build/distributions/blank-java.zip build/blank-java-lib.zip

‎3-deploy.sh

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#!/bin/bash
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set -eo pipefail
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ARTIFACT_BUCKET=$(cat bucket-name.txt)
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TEMPLATE=template.yml
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if [ $1 ]
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then
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if [ $1 = mvn ]
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then
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TEMPLATE=template-mvn.yml
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mvn package
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fi
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else
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gradle build -i
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fi
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aws cloudformation package --template-file $TEMPLATE --s3-bucket $ARTIFACT_BUCKET --output-template-file out.yml
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aws cloudformation deploy --template-file out.yml --stack-name blank-java --capabilities CAPABILITY_NAMED_IAM

‎4-invoke.sh

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#!/bin/bash
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set -eo pipefail
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FUNCTION=$(aws cloudformation describe-stack-resource --stack-name blank-java --logical-resource-id function --query 'StackResourceDetail.PhysicalResourceId' --output text)
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while true; do
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aws lambda invoke --function-name $FUNCTION --payload file://event.json out.json
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cat out.json
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echo ""
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sleep 2
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done

‎5-cleanup.sh

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#!/bin/bash
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set -eo pipefail
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STACK=blank-java
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if [[ $# -eq 1 ]] ; then
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STACK=$1
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echo "Deleting stack $STACK"
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fi
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FUNCTION=$(aws cloudformation describe-stack-resource --stack-name $STACK --logical-resource-id function --query 'StackResourceDetail.PhysicalResourceId' --output text)
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aws cloudformation delete-stack --stack-name $STACK
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echo "Deleted $STACK stack."
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if [ -f bucket-name.txt ]; then
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ARTIFACT_BUCKET=$(cat bucket-name.txt)
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if [[ ! $ARTIFACT_BUCKET =~ lambda-artifacts-[a-z0-9]{16} ]] ; then
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echo "Bucket was not created by this application. Skipping."
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else
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while true; do
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read -p "Delete deployment artifacts and bucket ($ARTIFACT_BUCKET)? (y/n)" response
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case $response in
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[Yy]* ) aws s3 rb --force s3://$ARTIFACT_BUCKET; rm bucket-name.txt; break;;
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[Nn]* ) break;;
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* ) echo "Response must start with y or n.";;
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esac
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done
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fi
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fi
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while true; do
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read -p "Delete function log group (/aws/lambda/$FUNCTION)? (y/n)" response
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case $response in
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[Yy]* ) aws logs delete-log-group --log-group-name /aws/lambda/$FUNCTION; break;;
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[Nn]* ) break;;
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* ) echo "Response must start with y or n.";;
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esac
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done
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rm -f out.yml out.json
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rm -rf build .gradle target

‎README.md

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# Blank function (Java)
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![Architecture](/sample-apps/blank-java/images/sample-blank-java.png)
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The project source includes function code and supporting resources:
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- `src/main` - A Java function.
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- `src/test` - A unit test and helper classes.
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- `template.yml` - An AWS CloudFormation template that creates an application.
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- `build.gradle` - A Gradle build file.
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- `pom.xml` - A Maven build file.
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- `1-create-bucket.sh`, `2-build-layer.sh`, etc. - Shell scripts that use the AWS CLI to deploy and manage the application.
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Use the following instructions to deploy the sample application.
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# Requirements
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- [Java 8 runtime environment (SE JRE)](https://www.oracle.com/java/technologies/javase-downloads.html)
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- [Gradle 5](https://gradle.org/releases/) or [Maven 3](https://maven.apache.org/docs/history.html)
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- The Bash shell. For Linux and macOS, this is included by default. In Windows 10, you can install the [Windows Subsystem for Linux](https://docs.microsoft.com/en-us/windows/wsl/install-win10) to get a Windows-integrated version of Ubuntu and Bash.
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- [The AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html) v1.17 or newer.
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If you use the AWS CLI v2, add the following to your [configuration file](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-files.html) (`~/.aws/config`):
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```
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cli_binary_format=raw-in-base64-out
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```
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This setting enables the AWS CLI v2 to load JSON events from a file, matching the v1 behavior.
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# Setup
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Download or clone this repository.
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$ git clone https://github.com/awsdocs/aws-lambda-developer-guide.git
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$ cd aws-lambda-developer-guide/sample-apps/blank-java
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To create a new bucket for deployment artifacts, run `1-create-bucket.sh`.
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blank-java$ ./1-create-bucket.sh
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make_bucket: lambda-artifacts-a5e491dbb5b22e0d
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To build a Lambda layer that contains the function's runtime dependencies, run `2-build-layer.sh`. Packaging dependencies in a layer reduces the size of the deployment package that you upload when you modify your code.
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blank-java$ ./2-build-layer.sh
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# Deploy
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To deploy the application, run `3-deploy.sh`.
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blank-java$ ./3-deploy.sh
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BUILD SUCCESSFUL in 1s
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Successfully packaged artifacts and wrote output template to file out.yml.
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Waiting for changeset to be created..
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Successfully created/updated stack - blank-java
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This script uses AWS CloudFormation to deploy the Lambda functions and an IAM role. If the AWS CloudFormation stack that contains the resources already exists, the script updates it with any changes to the template or function code.
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You can also build the application with Maven. To use maven, add `mvn` to the command.
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java-basic$ ./3-deploy.sh mvn
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[INFO] Scanning for projects...
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[INFO] -----------------------< com.example:blank-java >-----------------------
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[INFO] Building blank-java-function 1.0-SNAPSHOT
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[INFO] --------------------------------[ jar ]---------------------------------
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...
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# Test
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To invoke the function, run `4-invoke.sh`.
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blank-java$ ./4-invoke.sh
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{
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"StatusCode": 200,
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"ExecutedVersion": "$LATEST"
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}
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Let the script invoke the function a few times and then press `CRTL+C` to exit.
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The application uses AWS X-Ray to trace requests. Open the [X-Ray console](https://console.aws.amazon.com/xray/home#/service-map) to view the service map.
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![Service Map](/sample-apps/blank-java/images/blank-java-servicemap.png)
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Choose a node in the main function graph. Then choose **View traces** to see a list of traces. Choose any trace to view a timeline that breaks down the work done by the function.
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![Trace](/sample-apps/blank-java/images/blank-java-trace.png)
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Finally, view the application in the Lambda console.
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*To view the application*
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1. Open the [applications page](https://console.aws.amazon.com/lambda/home#/applications) in the Lambda console.
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2. Choose **blank-java**.
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![Application](/sample-apps/blank-java/images/blank-java-application.png)
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# Cleanup
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To delete the application, run `5-cleanup.sh`.
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blank$ ./5-cleanup.sh

‎build.gradle

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plugins {
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id 'java'
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}
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repositories {
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mavenCentral()
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}
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dependencies {
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implementation platform('software.amazon.awssdk:bom:2.10.73')
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implementation platform('com.amazonaws:aws-xray-recorder-sdk-bom:2.4.0')
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implementation 'software.amazon.awssdk:lambda'
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implementation 'com.amazonaws:aws-xray-recorder-sdk-core'
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implementation 'com.amazonaws:aws-xray-recorder-sdk-aws-sdk-core'
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implementation 'com.amazonaws:aws-xray-recorder-sdk-aws-sdk-v2'
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implementation 'com.amazonaws:aws-xray-recorder-sdk-aws-sdk-v2-instrumentor'
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implementation 'com.amazonaws:aws-lambda-java-core:1.2.1'
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implementation 'com.amazonaws:aws-lambda-java-events:2.2.9'
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implementation 'com.google.code.gson:gson:2.8.6'
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implementation 'org.apache.logging.log4j:log4j-api:[2.17.1,)'
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implementation 'org.apache.logging.log4j:log4j-core:[2.17.1,)'
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runtimeOnly 'org.apache.logging.log4j:log4j-slf4j18-impl:[2.17.1,)'
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runtimeOnly 'com.amazonaws:aws-lambda-java-log4j2:1.5.0'
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testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
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testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.6.0'
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}
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test {
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useJUnitPlatform()
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}
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task packageFat(type: Zip) {
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from compileJava
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from processResources
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into('lib') {
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from configurations.runtimeClasspath
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}
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dirMode = 0755
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fileMode = 0755
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}
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task packageLibs(type: Zip) {
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into('java/lib') {
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from configurations.runtimeClasspath
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}
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dirMode = 0755
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fileMode = 0755
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}
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task packageSkinny(type: Zip) {
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from compileJava
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from processResources
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}
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java {
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sourceCompatibility = JavaVersion.VERSION_1_8
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targetCompatibility = JavaVersion.VERSION_1_8
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}
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build.dependsOn packageSkinny

‎event.json

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{
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"Records": [
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{
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"messageId": "19dd0b57-b21e-4ac1-bd88-01bbb068cb78",
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"receiptHandle": "MessageReceiptHandle",
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"body": "Hello from SQS!",
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"attributes": {
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"ApproximateReceiveCount": "1",
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"SentTimestamp": "1523232000000",
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"SenderId": "123456789012",
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"ApproximateFirstReceiveTimestamp": "1523232000001"
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},
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"messageAttributes": {},
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"md5OfBody": "7b270e59b47ff90a553787216d55d91d",
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"eventSource": "aws:sqs",
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"eventSourceARN": "arn:aws:sqs:us-west-2:123456789012:MyQueue",
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"awsRegion": "us-west-2"
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}
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]
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}

‎images/blank-java-application.png

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‎images/blank-java-servicemap.png

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