✅ How to use MapStruct to merge to Java beans | Quarkus Tutorial
00:00 Introduction | MapStruct and Quarkus Tutorial
00:16 MapStruct merge | MapStruct and Quarkus Tutorial
00:35 MapStruct Quarkus project | MapStruct and Quarkus Tutorial
00:50 Update Movie method | MapStruct and Quarkus Tutorial
01:25 Updating Movie | MapStruct and Quarkus Tutorial
02:10 Merge MapStruct | MapStruct and Quarkus Tutorial
02:50 MappingTarget annotation | MapStruct and Quarkus Tutorial
03:20 Mapper Strategy Ignore | MapStruct and Quarkus Tutorial
03:40 Using merge in Quarkus | MapStruct and Quarkus Tutorial
04:20 Run project | MapStruct and Quarkus Tutorial
05:10 Test updateMovie method | MapStruct and Quarkus Tutorial
08:00 Recap MapStruct merge | MapStruct and Quarkus Tutorial
08:23 GitHub Repository | MapStruct and Quarkus Tutorial
What is Quarkus?
Quarkus is a Cloud Native, (Linux) Container First framework for writing Java applications. Quarkus is a MicroProfile implementation that focuses on efficiently running Java applications in containers in general and Kubernetes in particular. The MicroProfile project is aimed at
optimizing Enterprise Java for the microservices architecture.
#quarkus #cloudnative #java
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
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
Table of Contents
The assertion in Java is used to ensure the correctness of any program’s assumptions as the assertion is assumed to be true when it is executed. The Java Virtual Machine throws an error named AssertionError if the assertion is false. The assertion in Java has found its application mainly for testing purposes. Boolean expressions are used along with assertion statements. An assertion is a statement, and the ‘asset’ keyword is used to carry out an assertion in Java.
#full stack development #assertion in java #assertion in java #assertion in java #what is assertion in java #how to use assertion in java
Maps, meet Stream. Merging made simple.
In Java, we can merge a key/value pair into a
Map with the
merge method. The first parameter is the key, the second the value, and the third parameter of the
merge method is a remapping function that is applied when the key is already present in the
Map instance. The remapping function has the value of the key in the original
Map and the new value. We can define in the function what the resulting value should be. If we return
null, the key is ignored.
If we want to merge multiple
Map instances, we can use the Stream API. We want to convert the
Map instances to a stream of
Map.Entry instances, which we then turn into a new
Map instance with the
toMap method from the class
toMap method also takes a remapping function when there is a duplicate key. The function defines what the new value is based on the two values of the duplicate key that was encountered. We can choose to simply ignore one of the values and return the other value. But we can also do some computations in this function, for example creating a new value using both values.
#java #tutorial #merge #java stream api #java 15 #java maps
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