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Commit d3d23ad

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steps to create the layer zip yourself
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‎README.md

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@@ -34,13 +34,15 @@ Function exampleWithLayer = new Function(this, "ExampleWithLayer", FunctionProps
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.build());
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```
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## Java 17
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## Layer Details
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### Java 17
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A custom JRE is created to reduce final file size. Lambda has a 250MB unzipped file size limit.
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[Dockerfile](Dockerfile) describes how the JRE is built.
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## JVM Settings
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### JVM Settings
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The following JVM settings are added by default.
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Further suggestions welcomed
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## Java Class Path
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### Java Class Path
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```
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aws-lambda-java-runtime-interface-client-1.1.0.jar
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$LAMBDA_TASK_ROOT/*
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$LAMBDA_TASK_ROOT/lib/*
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```
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## Build the layer zip yourself
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### Requirements
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- Docker
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### Steps
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- Run `build-jre.sh` to build the minimal Java 17 runtime
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- Run `make-layer.sh` to package the runtime, dependencies and bootstrap as a zip
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‎build-jre.sh

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docker build --progress=plain -t graalvm-al2-slim .
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docker run -v $(pwd)/layer:/tmp -it graalvm-al2-slim sh -c "cp /opt/jre-17-slim.zip /tmp"
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docker build --progress=plain -t jre17-al2-slim .
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docker run -v $(pwd)/layer:/tmp -it jre17-al2-slim sh -c "cp /opt/jre-17-slim.zip /tmp"

‎make-layer.sh

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# -4 IPv4 only
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# -L follow redirect if the server responds with a redirect
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curl -4 -L https://repo.maven.apache.org/maven2/com/amazonaws/aws-lambda-java-runtime-interface-client/1.1.0/aws-lambda-java-runtime-interface-client-1.1.0.jar -o aws-lambda-java-runtime-interface-client-1.1.0.jar
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curl -4 -L https://repo.maven.apache.org/maven2/com/amazonaws/aws-lambda-java-core/1.2.1/aws-lambda-java-core-1.2.1.jar -o aws-lambda-java-core-1.2.1.jar
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curl -4 -L https://repo.maven.apache.org/maven2/com/amazonaws/aws-lambda-java-serialization/1.0.0/aws-lambda-java-serialization-1.0.0.jar -o aws-lambda-java-serialization-1.0.0.jar
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curl -4 -L https://repo.maven.apache.org/maven2/com/amazonaws/aws-lambda-java-runtime-interface-client/1.1.0/aws-lambda-java-runtime-interface-client-1.1.0.jar -o layer/aws-lambda-java-runtime-interface-client-1.1.0.jar
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curl -4 -L https://repo.maven.apache.org/maven2/com/amazonaws/aws-lambda-java-core/1.2.1/aws-lambda-java-core-1.2.1.jar -o layer/aws-lambda-java-core-1.2.1.jar
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curl -4 -L https://repo.maven.apache.org/maven2/com/amazonaws/aws-lambda-java-serialization/1.0.0/aws-lambda-java-serialization-1.0.0.jar -o layer/aws-lambda-java-serialization-1.0.0.jar
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chmod 755 bootstrap && zip -r java17layer.zip jre17-slim bootstrap aws-lambda-java-runtime-interface-client-1.1.0.jar aws-lambda-java-core-1.2.1.jar aws-lambda-java-serialization-1.0.0.jar
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chmod 755 bootstrap && zip -r java17layer.zip jre17-slim bootstrap layer/aws-lambda-java-runtime-interface-client-1.1.0.jar layer/aws-lambda-java-core-1.2.1.jar layer/aws-lambda-java-serialization-1.0.0.jar

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