このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
java lambda class not found
対処
関連リンク
AWS Lambda: ClassNotFoundException - Stack Overflow
https://stackoverflow.com/questions/46943897/aws-lambda-classnotfoundexception
AWS Lambda ClassNotFoundException
https://stackoverflow.com/questions/50213439/aws-lambda-classnotfoundexception
Class not found Exception for AWS lambda
https://stackoverflow.com/questions/43897465/class-not-found-exception-for-aws-lambda
AWS Lambda: class java.lang.ClassNotFoundException
https://stackoverflow.com/questions/42693229/aws-lambda-class-java-lang-classnotfoundexception
AWS Lambda NoClassDefFoundError
https://stackoverflow.com/questions/32782980/aws-lambda-noclassdeffounderror
LambdaをKotlinのjarで動かそうとしたらNoClassDefFoundErrorが出た ...
https://takeda-san.hatenablog.com/entry/2018/07/24/235539
Class not found: example.Hello: java.lang.ClassNotFoundException ...
https://github.com/alexa/skill-samples-java/issues/6
aws-java-gradle produces flawed zip file ・ Issue #2711 ・ serverless ...
https://github.com/serverless/serverless/issues/2711
java.lang.ClassNotFoundException: my.service ... - GitHub
https://github.com/awslabs/aws-serverless-java-container/issues/153
AWS|Packaging|Artifact|Java : ClassNotFoundException - Serverless ...
https://forum.serverless.com/t/aws-packaging-artifact-java-classnotfoundexception/4895