AWS Java SDK V2 - DynamoDB enhanced with Kotlin

Introduction

If you have been using the AWS Java SDK for DynamoDB since its version 1, you will have implemented or come across the DynamoDBMapper class. This class allows us to define the relationship or mapping between the actual items in the DynamoDB table and the Java POJO classes in our application.

In other words, the AWS Java SDK takes care of or abstracts out the low-level operations, i.e., constructing the relevant DynamoDB expression for the corresponding CRUD operations. This is very convenient for us when we write our application code.

To cut the story short, here comes the AWS Java SDK version 2. It is a major rewrite of version 1. The initial releases did not have the DynamoDB abstraction as provided by the DynamoDBMapper class from version 1. What this means is that we need to handle the low-level operations, i.e., constructing attribute values and the Java POJO class objects.

#kotlin #aws #dynamodb #aws java sdk

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AWS Java SDK V2 - DynamoDB enhanced with Kotlin

AWS Java SDK V2 - DynamoDB enhanced with Kotlin

Introduction

If you have been using the AWS Java SDK for DynamoDB since its version 1, you will have implemented or come across the DynamoDBMapper class. This class allows us to define the relationship or mapping between the actual items in the DynamoDB table and the Java POJO classes in our application.

In other words, the AWS Java SDK takes care of or abstracts out the low-level operations, i.e., constructing the relevant DynamoDB expression for the corresponding CRUD operations. This is very convenient for us when we write our application code.

To cut the story short, here comes the AWS Java SDK version 2. It is a major rewrite of version 1. The initial releases did not have the DynamoDB abstraction as provided by the DynamoDBMapper class from version 1. What this means is that we need to handle the low-level operations, i.e., constructing attribute values and the Java POJO class objects.

#kotlin #aws #dynamodb #aws java sdk

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

Samanta  Moore

Samanta Moore

1620458875

Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **var. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word var has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity

Download Android SDK Manager and SDK Tools

In this tutorial, we’ll read about the Android SDK Manager. We will see what is SDK manager in Android and why and how it is important for Android. So, SDK stands for Software Development Kit, which is a collection of software tools required. SDK basically helps Android to download tools and recent versions of Android. Every time a new Android version is released, along with it is released an SDK corresponding to it. This SDK must be installed by the developers for the devices.
What is SDK Manager?
A Software development kit is a set of tools required for the development of applications for Android. It also ensures that the progress of App development goes as flat as pancakes. We need SDK irrespective of the language we are using. Android SDK comes wrapped up with the Android Studio these days. An Android SDK separates the tools, platforms and other components into packages. These can be downloaded from the SDK Manager.

#android tutorials #android sdk manager #android sdk manager download #android sdk tools #android studio sdk manager #sdk download #sdk manager #sdk tools

Samanta  Moore

Samanta Moore

1620462686

Spring Boot and Java 16 Records

In this article, we will discuss Java 16’s newest feature, Records. Then we will apply this knowledge and use it in conjunction with a Spring Boot application.

On March 16th, 2021, Java 16 was GA. With this new release, tons of new exciting features have been added. Check out the release notes to know more about these changes in detail. This article’s focus will be on Java Records, which got delivered with JEP 395. Records were first introduced in JDK 14 as a preview feature proposed by JEP 359, and with JDK 15, they remained in preview with JEP 384. However, with JDK 16, Records are no longer in preview.

I have picked Records because they are definitely the most favored feature added in Java 16, according to this Twitter poll by Java Champion Mala Gupta.

I also conducted a similar survey, but it was focused on features from Java 8 onwards. The results were not unexpected, as Java 8 is still widely used. Very unfortunate, though, as tons of new features and improvements are added to newer Java versions. But in terms of features, Java 8 was definitely a game-changer from a developer perspective.

So let’s discuss what the fuss is about Java Records.

#java #springboot #java programming #records #java tutorials #java programmer #java records #java 16