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updated documentation · AshwinDora/aws-lambda-java-libs@cd5e78e · GitHub

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updated documentation
Updated documentation to reflect aws-lambda-java-events and aws-lambda-java-log4j2 updates.
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‎README.md‎

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# AWS Lambda Java Support Libraries
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# AWS Lambda Java Support Libraries
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Interface definitions for Java code running on the AWS Lambda platform.
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For issues and questions, you can start with our [FAQ](https://aws.amazon.com/lambda/faqs/) and the [AWS forums](https://forums.aws.amazon.com/forum.jspa?forumID=186)
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To get started writing AWS Lambda functions in Java, check out the [official documentation] (http://docs.aws.amazon.com/lambda/latest/dg/java-gs.html).
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# Disclaimer of use
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Each of the supplied packages should be used without modification. Removing
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dependencies, adding conflicting dependencies, or selectively including classes
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from the packages can result in unexpected behavior, which the AWS Lambda team
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is not responsible for.
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# Recent Updates!
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* ### [2017 Java Events Update](https://github.com/aws/aws-lambda-java-libs/tree/master/aws-lambda-java-events)
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* ### [Log4j2 Support](https://github.com/aws/aws-lambda-java-libs/tree/master/aws-lambda-java-log4j2)
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# Where to get packages
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___
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[Maven](https://maven.apache.org)
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-events</artifactId>
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<version>1.3.0</version>
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<version>2.0</version>
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</dependency>
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<dependency>
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<groupId>com.amazonaws</groupId>
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```groovy
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'com.amazonaws:aws-lambda-java-core:1.1.0'
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'com.amazonaws:aws-lambda-java-events:1.3.0'
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'com.amazonaws:aws-lambda-java-events:2.0'
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'com.amazonaws:aws-lambda-java-log4j:1.0.0'
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'com.amazonaws:aws-lambda-java-log4j2:1.0.0'
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```
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```clojure
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[com.amazonaws/aws-lambda-java-core "1.1.0"]
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[com.amazonaws/aws-lambda-java-events "1.3.0"]
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[com.amazonaws/aws-lambda-java-events "2.0"]
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[com.amazonaws/aws-lambda-java-log4j "1.0.0"]
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[com.amazonaws/aws-lambda-java-log4j2 "1.0.0"]
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```
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```scala
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"com.amazonaws" % "aws-lambda-java-core" % "1.1.0"
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"com.amazonaws" % "aws-lambda-java-events" % "1.3.0"
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"com.amazonaws" % "aws-lambda-java-events" % "2.0"
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"com.amazonaws" % "aws-lambda-java-log4j" % "1.0.0"
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"com.amazonaws" % "aws-lambda-java-log4j2" % "1.0.0"
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```
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# Using aws-lambda-java-core
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This package defines the Lambda [Context](http://docs.aws.amazon.com/lambda/latest/dg/java-context-object.html)
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object as well as [interfaces](http://docs.aws.amazon.com/lambda/latest/dg/java-handler-using-predefined-interfaces.html) that Lambda accepts.
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# Using aws-lambda-java-events
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This package defines [event sources](http://docs.aws.amazon.com/lambda/latest/dg/intro-invocation-modes.html) that AWS Lambda natively accepts. See the [documentation](https://github.com/aws/aws-lambda-java-libs/tree/master/aws-lambda-java-events) for more information.
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# Using aws-lambda-java-log4j2
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This package defines the Lambda adapter to use with log4j version 2. See
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[documentation](https://github.com/aws/aws-lambda-java-libs/tree/master/aws-lambda-java-log4j2) for how to use the adapter.
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# Using aws-lambda-java-log4j (Not recommended)
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This package defines the Lambda adapter to use with log4j version 1. See
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the [official documentation](http://docs.aws.amazon.com/lambda/latest/dg/java-logging.html#java-wt-logging-using-log4j) for how to use this adapter.

‎aws-lambda-java-events/README.md‎

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# AWS Lambda Java Events v2.0
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### New Event Models Supported
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* APIGatewayProxyRequestEvent
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* APIGatewayProxyResponseEvent
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* CloudFrontEvent
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* CloudWatchLogsEvent
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* CodeCommitEvent
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* IoTButtonEvent
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* KinesisFirehoseEvent
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* LexEvent
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* ScheduledEvent
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### New package inclusion model
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The old package inclusion model required users to pull unused dependencies into
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their package. We have removed this inclusion so that users' jars will be
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smaller, which will results in reduced latency times. Customers using older
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versions do not need to make any changes to their existing code.
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The following event models do not require any SDK dependencies
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* APIGatewayProxyRequestEvent
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* APIGatewayProxyResponseEvent
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* CloudFrontEvent
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* CloudWatchLogsEvent
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* CodeCommitEvent
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* CognitoEvent
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* ConfigEvent
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* IoTButtonEvent
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* KinesisFirehoseEvent
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* LexEvent
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* ScheduledEvent
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* SNSEvent
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so the dependencies section in the pom.xml file would like this
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```xml
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<dependencies>
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...
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-core</artifactId>
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<version>1.1.0</version>
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</dependency>
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-events</artifactId>
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<version>2.0</version>
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</dependency>
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...
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</dependencies>
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```
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#### S3 Event
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For the S3 event the pom would look like this:
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```xml
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<dependencies>
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...
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-core</artifactId>
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<version>1.1.0</version>
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</dependency>
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-events</artifactId>
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<version>2.0</version>
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</dependency>
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-java-sdk-s3</artifactId>
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<version>1.11.163</version>
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</dependency>
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...
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</dependencies>
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```
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#### Kinesis Event
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For the Kinesis event
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```xml
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<dependencies>
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....
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-core</artifactId>
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<version>1.1.0</version>
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</dependency>
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-events</artifactId>
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<version>2.0</version>
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</dependency>
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-java-sdk-kinesis</artifactId>
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<version>1.11.163</version>
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</dependency>
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...
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</dependencies>
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```
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#### Dynamodb Event
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For the Dynamodb event
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```xml
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<dependencies>
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...
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-core</artifactId>
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<version>1.1.0</version>
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</dependency>
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-events</artifactId>
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<version>2.0</version>
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</dependency>
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-java-sdk-dynamodb</artifactId>
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<version>1.11.163</version>
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</dependency>
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...
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</dependencies>
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```

‎aws-lambda-java-log4j2/README.md‎

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# Using log4j2 with AWS Lambda
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### 1. Pull in log4j2 dependencies
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Example for Maven pom.xml
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```xml
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<dependencies>
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...
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<dependency>
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<groupId>com.amazonaws</groupId>
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<artifactId>aws-lambda-java-log4j2</artifactId>
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<version>1.0.0</version>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core</artifactId>
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<version>2.8.2</version>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-api</artifactId>
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<version>2.8.2</version>
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</dependency>
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....
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</dependencies>
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```
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If using maven shade plugin, set the plugin configuration as follows
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```xml
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<plugins>
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...
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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<version>2.4.3</version>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>shade</goal>
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</goals>
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<configuration>
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<transformers>
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<transformer
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implementation="com.github.edwgiz.mavenShadePlugin.log4j2CacheTransformer.PluginsCacheFileTransformer">
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</transformer>
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</transformers>
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</configuration>
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</execution>
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</executions>
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<dependencies>
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<dependency>
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<groupId>com.github.edwgiz</groupId>
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<artifactId>maven-shade-plugin.log4j2-cachefile-transformer</artifactId>
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<version>2.8.1</version>
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</dependency>
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</dependencies>
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</plugin>
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...
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</plugins>
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```
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### 2. Configure log4j2 using log4j2.xml file
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Add the following file `<project-dir>/src/main/resources/log4j2.xml`
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<Configuration packages="com.amazonaws.services.lambda.runtime.log4j2.LambdaAppender">
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<Appenders>
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<Lambda name="Lambda">
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<PatternLayout>
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<pattern>%d{yyyy-MM-dd HH:mm:ss} %X{AWSRequestId} %-5p %c{1}:%L - %m%n</pattern>
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</PatternLayout>
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</Lambda>
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</Appenders>
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<Loggers>
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<Root level="debug">
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<AppenderRef ref="Lambda" />
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</Root>
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</Loggers>
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</Configuration>
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```
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### 3. Example code
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```java
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package example;
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import com.amazonaws.services.lambda.runtime.Context;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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public class Hello {
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// Initialize the Log4j logger.
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static final Logger logger = LogManager.getLogger(Hello.class);
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public String myHandler(String name, Context context) {
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// System.out: One log statement but with a line break (AWS Lambda writes two events to CloudWatch).
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System.out.println("log data from stdout \n this is continuation of system.out");
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// System.err: One log statement but with a line break (AWS Lambda writes two events to CloudWatch).
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System.err.println("log data from stderr. \n this is a continuation of system.err");
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// Use log4j to log the same thing as above and AWS Lambda will log only one event in CloudWatch.
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logger.debug("log data from log4j debug \n this is continuation of log4j debug");
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logger.error("log data from log4j err. \n this is a continuation of log4j.err");
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// Return will include the log stream name so you can look
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// up the log later.
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return String.format("Hello %s. log stream = %s", name, context.getLogStreamName());
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}
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}
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```

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