Deploy Java Lambda functions with .zip or JAR file archives - Amazon Lambda
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Deploy Java Lambda functions with .zip or JAR file archives

Your Amazon Lambda function's code consists of scripts or compiled programs and their dependencies. You use a deployment package to deploy your function code to Lambda. Lambda supports two types of deployment packages: container images and .zip file archives.

This page describes how to create your deployment package as a .zip file or Jar file, and then use the deployment package to deploy your function code to Amazon Lambda using the Amazon Command Line Interface (Amazon CLI).


The Amazon CLI is an open-source tool that enables you to interact with Amazon services using commands in your command line shell. To complete the steps in this section, you must have the following:

Tools and libraries

Lambda provides the following libraries for Java functions:

These libraries are available through Maven Central Repository. Add them to your build definition as follows:

dependencies { implementation 'com.amazonaws:aws-lambda-java-core:1.2.2' implementation 'com.amazonaws:aws-lambda-java-events:3.11.1' runtimeOnly 'com.amazonaws:aws-lambda-java-log4j2:1.5.1' }
<dependencies> <dependency> <groupId>com.amazonaws</groupId> <artifactId>aws-lambda-java-core</artifactId> <version>1.2.2</version> </dependency> <dependency> <groupId>com.amazonaws</groupId> <artifactId>aws-lambda-java-events</artifactId> <version>3.11.1</version> </dependency> <dependency> <groupId>com.amazonaws</groupId> <artifactId>aws-lambda-java-log4j2</artifactId> <version>1.5.1</version> </dependency> </dependencies>

To create a deployment package, compile your function code and dependencies into a single .zip file or Java Archive (JAR) file. For Gradle, use the Zip build type. For Apache Maven, use the Maven Shade plugin. To upload your deployment package, use the Lambda console, the Lambda API, or Amazon Serverless Application Model (Amazon SAM).


To keep your deployment package size small, package your function's dependencies in layers. Layers enable you to manage your dependencies independently, can be used by multiple functions, and can be shared with other accounts. For more information, see Creating and sharing Lambda layers.

Building a deployment package with Gradle

To create a deployment package with your function's code and dependencies in Gradle, use the Zip build type. Here's an example from a complete sample build.gradle file:

Example build.gradle – Build task
task buildZip(type: Zip) { into('lib') { from(jar) from(configurations.runtimeClasspath) } }

This build configuration produces a deployment package in the build/distributions directory. Within the into('lib') statement, the jar task assembles a jar archive containing your main classes into a folder named lib. Additionally, the configurations.runtimeClassPath task copies dependency libraries from the build's classpath into the same lib folder.

Example build.gradle – Dependencies
dependencies { ... implementation 'com.amazonaws:aws-lambda-java-core:1.2.2' implementation 'com.amazonaws:aws-lambda-java-events:3.11.1' implementation 'org.apache.logging.log4j:log4j-api:2.17.1' implementation 'org.apache.logging.log4j:log4j-core:2.17.1' runtimeOnly 'org.apache.logging.log4j:log4j-slf4j18-impl:2.17.1' runtimeOnly 'com.amazonaws:aws-lambda-java-log4j2:1.5.1' ... }

Lambda loads JAR files in Unicode alphabetical order. If multiple JAR files in the lib directory contain the same class, the first one is used. You can use the following shell script to identify duplicate classes:

mkdir -p expanded unzip path/to/my/ -d expanded find ./expanded/lib -name '*.jar' | xargs -n1 zipinfo -1 | grep '.*.class' | sort | uniq -c | sort

Building a deployment package with Maven

To build a deployment package with Maven, use the Maven Shade plugin. The plugin creates a JAR file that contains the compiled function code and all of its dependencies.

Example pom.xml – Plugin configuration
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>3.2.2</version> <configuration> <createDependencyReducedPom>false</createDependencyReducedPom> </configuration> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> </execution> </executions> </plugin>

To build the deployment package, use the mvn package command.

[INFO] Scanning for projects... [INFO] -----------------------< com.example:java-maven >----------------------- [INFO] Building java-maven-function 1.0-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- ... [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ java-maven --- [INFO] Building jar: target/java-maven-1.0-SNAPSHOT.jar [INFO] [INFO] --- maven-shade-plugin:3.2.2:shade (default) @ java-maven --- [INFO] Including com.amazonaws:aws-lambda-java-core:jar:1.2.2 in the shaded jar. [INFO] Including com.amazonaws:aws-lambda-java-events:jar:3.11.1 in the shaded jar. [INFO] Including joda-time:joda-time:jar:2.6 in the shaded jar. [INFO] Including in the shaded jar. [INFO] Replacing original artifact with shaded artifact. [INFO] Replacing target/java-maven-1.0-SNAPSHOT.jar with target/java-maven-1.0-SNAPSHOT-shaded.jar [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 8.321 s [INFO] Finished at: 2020-03-03T09:07:19Z [INFO] ------------------------------------------------------------------------

This command generates a JAR file in the target directory.


If you're working with a multi-release JAR (MRJAR), you must include the MRJAR (i.e. the shaded JAR produced by the Maven Shade plugin) in the lib directory and zip it before uploading your deployment package to Lambda. Otherwise, Lambda may not properly unpack your JAR file, causing your MANIFEST.MF file to be ignored.

If you use the appender library (aws-lambda-java-log4j2), you must also configure a transformer for the Maven Shade plugin. The transformer library combines versions of a cache file that appear in both the appender library and in Log4j.

Example pom.xml – Plugin configuration with Log4j 2 appender
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>3.2.2</version> <configuration> <createDependencyReducedPom>false</createDependencyReducedPom> </configuration> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> <configuration> <transformers> <transformer implementation="com.github.edwgiz.maven_shade_plugin.log4j2_cache_transformer.PluginsCacheFileTransformer"> </transformer> </transformers> </configuration> </execution> </executions> <dependencies> <dependency> <groupId>com.github.edwgiz</groupId> <artifactId>maven-shade-plugin.log4j2-cachefile-transformer</artifactId> <version>2.13.0</version> </dependency> </dependencies> </plugin>

Uploading a deployment package with the Lambda console

You can upload a deployment package to any existing function using the Lambda console.

To upload a deployment package with the Lambda console
  1. Open the Functions page of the Lambda console.

  2. Choose a function.

  3. Under Code source, choose Upload from.

  4. Upload the deployment package.

  5. Choose Save.

Uploading a deployment package with the Lambda API

To update a function's code with the Amazon Command Line Interface (Amazon CLI) or Amazon SDK, use the UpdateFunctionCode API operation. For the Amazon CLI, use the update-function-code command. The following command uploads a deployment package named in the current directory:

aws lambda update-function-code --function-name my-function --zip-file fileb://

You should see the following output:

{ "FunctionName": "my-function", "FunctionArn": "arn:aws-cn:lambda:us-east-2:123456789012:function:my-function", "Runtime": "java8", "Role": "arn:aws-cn:iam::123456789012:role/lambda-role", "Handler": "example.Handler", "CodeSha256": "Qf0hMc1I2di6YFMi9aXm3JtGTmcDbjniEuiYonYptAk=", "Version": "$LATEST", "TracingConfig": { "Mode": "Active" }, "RevisionId": "983ed1e3-ca8e-434b-8dc1-7d72ebadd83d", ... }

If your deployment package is larger than 50 MB, you can't upload it directly. Upload it to an Amazon Simple Storage Service (Amazon S3) bucket and point Lambda to the object. The following example commands upload a deployment package to an S3 bucket named my-bucket and use it to update a function's code:

aws s3 cp s3://my-bucket

You should see the following output:

upload: to s3://my-bucket/my-function
aws lambda update-function-code --function-name my-function \ --s3-bucket my-bucket --s3-key

You should see the following output:

{ "FunctionName": "my-function", "FunctionArn": "arn:aws-cn:lambda:us-east-2:123456789012:function:my-function", "Runtime": "java8", "Role": "arn:aws-cn:iam::123456789012:role/lambda-role", "Handler": "example.Handler", "CodeSha256": "Qf0hMc1I2di6YFMi9aXm3JtGTmcDbjniEuiYonYptAk=", "Version": "$LATEST", "TracingConfig": { "Mode": "Active" }, "RevisionId": "983ed1e3-ca8e-434b-8dc1-7d72ebadd83d", ... }

You can use this method to upload function packages up to 250 MB (decompressed).

Uploading a deployment package with Amazon SAM

You can use Amazon SAM to automate deployments of your function code, configuration, and dependencies. Amazon SAM is an extension of Amazon CloudFormation that provides a simplified syntax for defining serverless applications. The following example template defines a function with a deployment package in the build/distributions directory that Gradle uses:

Example template.yml
AWSTemplateFormatVersion: '2010-09-09' Transform: 'AWS::Serverless-2016-10-31' Description: An Amazon Lambda application that calls the Lambda API. Resources: function: Type: AWS::Serverless::Function Properties: CodeUri: build/distributions/ Handler: example.Handler Runtime: java8 Description: Java function MemorySize: 512 Timeout: 10 # Function's execution role Policies: - AWSLambdaBasicExecutionRole - AWSLambda_ReadOnlyAccess - AWSXrayWriteOnlyAccess - AWSLambdaVPCAccessExecutionRole Tracing: Active

To create the function, use the package and deploy commands. These commands are customizations to the Amazon CLI. They wrap other commands to upload the deployment package to Amazon S3, rewrite the template with the object URI, and update the function's code.

The following example script runs a Gradle build and uploads the deployment package that it creates. It creates an Amazon CloudFormation stack the first time you run it. If the stack already exists, the script updates it.

#!/bin/bash set -eo pipefail aws cloudformation package --template-file template.yml --s3-bucket MY_BUCKET --output-template-file out.yml aws cloudformation deploy --template-file out.yml --stack-name java-basic --capabilities CAPABILITY_NAMED_IAM

For a complete working example, see the following sample applications:

Sample Lambda applications in Java
  • java-basic – A collection of minimal Java functions with unit tests and variable logging configuration.

  • java-events – A collection of Java functions that contain skeleton code for how to handle events from various services such as Amazon API Gateway, Amazon SQS, and Amazon Kinesis. These functions use the latest version of the aws-lambda-java-events library (3.0.0 and newer). These examples do not require the Amazon SDK as a dependency.

  • s3-java – A Java function that processes notification events from Amazon S3 and uses the Java Class Library (JCL) to create thumbnails from uploaded image files.

  • Use API Gateway to invoke a Lambda function – A Java function that scans a Amazon DynamoDB table that contains employee information. It then uses Amazon Simple Notification Service to send a text message to employees celebrating their work anniversaries. This example uses API Gateway to invoke the function.