Scheduled (Cron) AWS Lambda Function with Java and Maven

Part IV of the Serverless Guide using AWS Lambda, Java 11, and Maven.

This part focuses on developing an AWS Lambda function that is regularly invoked based on a scheduling expression (e.g. cron) to check the availability of a website.

Part I: https://www.youtube.com/watch?v=Yq1MoTAS5ps
Part II: https://www.youtube.com/watch?v=5tVayUL1iQs
Part III: https://www.youtube.com/watch?v=_EPtVIX131c
Part IV: https://www.youtube.com/watch?v=_fNu9kn47kM
Part V: https://www.youtube.com/watch?v=5d03ifYTHcE

» Source code: https://github.com/rieckpil/blog-tutorials/tree/master/serverless-java-aws-examples/simple-aws-lambda
» Serverless homepage: https://www.serverless.com/
» Real-world AWS Lambda example to create image thumbnails: https://rieckpil.de/aws-lambda-with-serverless-java-and-maven-thumbnail-generator/

#aws #lambda #maven #java

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Buddha Community

Scheduled (Cron) AWS Lambda Function with Java and Maven
Tyrique  Littel

Tyrique Littel

1600135200

How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Scheduled (Cron) AWS Lambda Function with Java and Maven

Part IV of the Serverless Guide using AWS Lambda, Java 11, and Maven.

This part focuses on developing an AWS Lambda function that is regularly invoked based on a scheduling expression (e.g. cron) to check the availability of a website.

Part I: https://www.youtube.com/watch?v=Yq1MoTAS5ps
Part II: https://www.youtube.com/watch?v=5tVayUL1iQs
Part III: https://www.youtube.com/watch?v=_EPtVIX131c
Part IV: https://www.youtube.com/watch?v=_fNu9kn47kM
Part V: https://www.youtube.com/watch?v=5d03ifYTHcE

» Source code: https://github.com/rieckpil/blog-tutorials/tree/master/serverless-java-aws-examples/simple-aws-lambda
» Serverless homepage: https://www.serverless.com/
» Real-world AWS Lambda example to create image thumbnails: https://rieckpil.de/aws-lambda-with-serverless-java-and-maven-thumbnail-generator/

#aws #lambda #maven #java

Samanta  Moore

Samanta Moore

1624948542

Lambda Expression in Java 8

In this blog we will understand what is the lambda expression and why we need lambda expression and how we use lambda and about the functional interface.

What is Lambda Expression :
  • It is an anonymous function.
  • Not having name
  • No return type and no modifiers.

#functional programming #java #functional java #java #java 8 #java8 #lambda expressions in java

AWS Lambda HTTP Endpoint Function with Java and Maven

Part II of the Serverless Guide using AWS Lambda, Java 11, and Maven.

This part focuses on deploying an AWS Lambda which is behind an AWS API Gateway and triggered via HTTP.

Part I: https://www.youtube.com/watch?v=Yq1MoTAS5ps
Part II: https://www.youtube.com/watch?v=5tVayUL1iQs
Part III: https://www.youtube.com/watch?v=_EPtVIX131c
Part IV: https://www.youtube.com/watch?v=_fNu9kn47kM
Part V: https://www.youtube.com/watch?v=5d03ifYTHcE

Further resources:

» Source code: https://github.com/rieckpil/blog-tutorials/tree/master/serverless-java-aws-examples/simple-aws-lambda
» Serverless homepage: https://www.serverless.com/
» Real-world AWS Lambda example to create image thumbnails: https://rieckpil.de/aws-lambda-with-serverless-java-and-maven-thumbnail-generator/

#lambda #aws #java #maven

Samanta  Moore

Samanta Moore

1624974840

Functional Interfaces in Java 8

Introduction

Functional interface is an interface that consists of one abstract method. These interface can show only one functionality. Beyond Java 8, _lambda expressions _can be used to represent the instance of a functional interface. Functional Interfaces can contain any number of default methods. ConsumerPredicate, Function, Unary Operator, Binary Operator are some of the examples of predefined functional interfaces.

Points to remember which are allowed and which are not allowed in a functional interface:

  • In any functional interface, single abstract method is allowed.
  • In a functional interface, more than one abstract method cannot exist.
  • We can have more than one abstract method if we remove @FunctionalInterface  annotation, but that interface cannot be functional interface.

From functional interface if we remove @FunctionalInterface annotation, it must be valid. We use an annotation so that only single abstract method can be present. In functional interface we can provide implementations as the default methods inside interface.

#functional programming #java #java #java 8 #functional interfaces #functional interfaces in java 8