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https://github.com/aws/aws-lambda-java-libs

Official mirror for interface definitions and helper classes for Java code running on the AWS Lambda platform.
https://github.com/aws/aws-lambda-java-libs

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Official mirror for interface definitions and helper classes for Java code running on the AWS Lambda platform.

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# AWS Lambda Java Support Libraries

Key libraries for running Java on the AWS Lambda platform.



For issues and questions, you can start with our [FAQ](https://aws.amazon.com/lambda/faqs/)

and the AWS questions and answer site [re:Post](https://repost.aws/tags/TA5uNafDy2TpGNjidWLMSxDw/aws-lambda)



To get started writing Lambda functions in Java, check out the official [developer guide](https://docs.aws.amazon.com/lambda/latest/dg/lambda-java.html).



For information on how to optimize your functions watch the re:Invent talk [Optimize your Java application on AWS Lambda](https://www.youtube.com/watch?v=sVJOJUD0fhQ).



## Core Java Lambda interfaces - aws-lambda-java-core



This package defines the Lambda [Context](http://docs.aws.amazon.com/lambda/latest/dg/java-context-object.html) object

as well as [interfaces](http://docs.aws.amazon.com/lambda/latest/dg/java-handler-using-predefined-interfaces.html) that Lambda accepts.



- [Release Notes](aws-lambda-java-core/RELEASE.CHANGELOG.md)



Example request handler



```java

public class Handler implements RequestHandler, String>{

 @Override

 public String handleRequest(Map event, Context context) {



 }

}

```



Example request stream handler



```java

public class HandlerStream implements RequestStreamHandler {

  @Override

  public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {



  }

}

```



```xml



 com.amazonaws

 aws-lambda-java-core

 1.2.3



```



## Java objects of Lambda event sources - aws-lambda-java-events



This package defines [event sources](http://docs.aws.amazon.com/lambda/latest/dg/intro-invocation-modes.html) that Lambda natively accepts.

See the [documentation](aws-lambda-java-events/README.md) for a list of currently supported event sources.

Using this library you can have Java objects which represent event sources.



For example an SQS event:



```java

import com.amazonaws.services.lambda.runtime.events.SQSEvent;



public class SqsHandler implements RequestHandler {



 @Override

 public String handleRequest(SQSEvent event, Context context) {



 }

}

```



- [Release Notes](aws-lambda-java-events/RELEASE.CHANGELOG.md)



```xml



 com.amazonaws

 aws-lambda-java-events

 3.11.4



```



## Java Lambda JUnit Support - aws-lambda-java-tests



This package provides utils to ease Lambda Java testing. It uses the same Lambda serialisation logic and `aws-lambda-java-events` to inject events in your JUnit tests.



- [Release Notes](aws-lambda-java-tests/RELEASE.CHANGELOG.md)



```java

@ParameterizedTest

@Event(value = "sqs/sqs_event.json", type = SQSEvent.class)

public void testInjectSQSEvent(SQSEvent event) {

        ...

}

```



```xml



  com.amazonaws

  aws-lambda-java-tests

  1.1.1

  test



```



## aws-lambda-java-events-sdk-transformer



This package provides helper classes/methods to use alongside `aws-lambda-java-events` in order to transform

Lambda input event model objects into SDK-compatible output model objects.

See the [documentation](aws-lambda-java-events-sdk-transformer/README.md) for more information.



- [Release Notes](aws-lambda-java-events-sdk-transformer/RELEASE.CHANGELOG.md)



```xml



 com.amazonaws

 aws-lambda-java-events-sdk-transformer

 3.1.0



```



## Java Lambda Log4J2 support - aws-lambda-java-log4j2



This package defines the Lambda adapter to use with Log4J version 2.

See the [README](aws-lambda-java-log4j2/README.md) or the [official documentation](http://docs.aws.amazon.com/lambda/latest/dg/java-logging.html#java-wt-logging-using-log4j) for information on how to use the adapter.



- [Release Notes](aws-lambda-java-log4j2/RELEASE.CHANGELOG.md)



```xml



 com.amazonaws

 aws-lambda-java-log4j2

 1.6.0



```



## Java implementation of the Runtime Interface Client API - aws-lambda-java-runtime-interface-client



This package defines the Lambda Java Runtime Interface Client package, a Lambda Runtime component that starts the runtime and interacts with the Runtime API - i.e., it calls the API for invocation events, starts the function code, calls the API to return the response.

The purpose of this package is to allow developers to deploy their applications in Lambda under the form of Container Images. See the [README](aws-lambda-java-runtime-interface-client/README.md) for information on how to use the library.



- [Release Notes](aws-lambda-java-runtime-interface-client/RELEASE.CHANGELOG.md)



```xml



 com.amazonaws

 aws-lambda-java-runtime-interface-client

 2.4.0



```



## Java Lambda provided serialization support - aws-lambda-java-serialization



This package defines the Lambda serialization logic using in the `aws-lambda-java-runtime-client` library. It has no current standalone usage.



- [Release Notes](aws-lambda-java-serialization/RELEASE.CHANGELOG.md)



```xml



 com.amazonaws

 aws-lambda-java-serialization

 1.1.5



```



## Disclaimer of use



Each of the supplied packages should be used without modification. Removing

dependencies, adding conflicting dependencies, or selectively including classes

from the packages can result in unexpected behavior.