Code for my Medium article AWS Lambda for Java Developers

LambdaFunction.java

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;

public class LambdaFunction implements RequestHandler<Void, String> {

    private final long classloaderTime = System.currentTimeMillis();
    private final long constructorTime;
    private long methodTime;

    public LambdaFunction() {
        constructorTime = System.currentTimeMillis();
    }

    public String handleRequest(Void args, Context context) {
        methodTime = System.currentTimeMillis();

        return new StringBuilder()
                .append("classloaderTime=")
                .append(classloaderTime)
                .append(", constructorTime=")
                .append(constructorTime)
                .append(", methodTime=")
                .append(methodTime)
                .toString();
    }
}