Use Lambda Layers with Java
Introduction
I searched for the procedure for using Lambda Layers in Java, but I wrote it down because it was not easy to understand.
Preparation: Java to use
lambda layer side
Export with layer_print.jar
Print.java
package layer_print;
public class Print {
public static void print() {
System.out.println("print from layer!!");
}
}
Lambda's Handler class that uses layer
Create jar without layer_print.jar → Upload to lambda function
MyLambda.java
package lambda_layer_java;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import layer_print.Print;
public class MyLambda implements RequestHandler<Integer, String> {
@Override
public String handleRequest(Integer in, Context context) {
//lambda layer call
Print.print();
return "success";
}
}
procedure
-
Create java / lib folder locally
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Put the jar file to be layer in lib
-
Convert java folder to zip
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Select Layers for lambda in the AWS console. Press Create Layer
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Enter your name and description. Select java 8 with a compatible runtime. Upload the created zip file and create a layer
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Go to the lambda function that uses layers, select Layers and press Add Layer
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Select layer and version to add
-
Save and complete
that's all.
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