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initial README.md file

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`1`	`1`	`# lambda-java17-layer`
`2`	`2`	`AWS Lambda layer to enable Java 17 support`
	`3`	`+`
	`4`	`+## Usage`
	`5`	`+`
	`6`	`+- Create a function using the PROVIDED_AL2 runtime.`
	`7`	`+- Add this layer to your function.`
	`8`	`+`
	`9`	`+## Java 17`
	`10`	`+`
	`11`	`+A custom JRE is created to reduce final file size. Lambda has a 250MB unzipped file size limit.`
	`12`	`+`
	`13`	`+[Dockerfile](Dockerfile) describes how the JRE is built`
	`14`	`+`
	`15`	`+## JVM Settings`
	`16`	`+`
	`17`	`+The following JVM settings are added by default.`
	`18`	`+`
	`19`	+```
	`20`	`+--add-opens java.base/java.util=ALL-UNNAMED`
	`21`	`+-XX:+TieredCompilation -XX:TieredStopAtLevel=1`
	`22`	`+-Xshare:on`
	`23`	+```
	`24`	`+`
	`25`	`+Further suggestions welcomed`
	`26`	`+`
	`27`	`+## Java Class Path`
	`28`	`+`
	`29`	+```
	`30`	`+aws-lambda-java-runtime-interface-client-1.1.0.jar`
	`31`	`+aws-lambda-java-core-1.2.1.jar`
	`32`	`+aws-lambda-java-serialization-1.0.0.jar`
	`33`	`+$LAMBDA_TASK_ROOT`
	`34`	`+$LAMBDA_TASK_ROOT/*`
	`35`	`+$LAMBDA_TASK_ROOT/lib/*`
	`36`	+```

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