How to Ignore Fields using the JPA @Transient Annotation in Java

1. Introduction

When persisting Java objects into database records using an Object-Relational Mapping (ORM) framework, we often want to ignore certain fields. If the framework is compliant with the Java Persistence API (JPA), we can add the @Transient annotation to these fields.

In this tutorial, we’ll demonstrate proper usage of the @Transient annotation. We’ll also look at its relationship with Java’s built-in transient keyword.

2. @Transient Annotation vs. transient Keyword

There is generally some confusion over the relationship between the @Transient annotation and Java’s built-in transient keyword. The transient keyword is primarily meant for ignoring fields during Java object serialization, but it also prevents these fields from being persisted when using a JPA framework.

In other words, the transient keyword has the same effect as the @Transient annotation when saving to a database. However, the @Transient annotation does not affect Java object serialization.

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How to Ignore Fields using the JPA @Transient Annotation in Java

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

1621145400

Java Annotations Tutorial

An experienced Java developer gives a video tutorial on Java annotations, demonstrating how to use this key part of the Java language in your code.

Java Annotations Tutorial Playlist link:

https://www.youtube.com/watch?v=xdIeq…

Click the below links to download the Java Source code and PPT:

https://drive.google.com/file/d/1xqGl…

https://drive.google.com/file/d/1eWTr…

https://drive.google.com/file/d/1WFXB…

https://drive.google.com/file/d/1zdp8…

https://drive.google.com/file/d/1LXTv…

https://drive.google.com/file/d/1X1b1…

https://drive.google.com/file/d/1odeJ…

https://drive.google.com/file/d/1Oqqf…

https://drive.google.com/file/d/1rYxF…

https://drive.google.com/file/d/1fL7X…

https://drive.google.com/file/d/1wGlM…

https://drive.google.com/file/d/17jj5…

https://drive.google.com/file/d/1lCnX…

You can find the Java source code for each example in this blog - https://ramj2ee.blogspot.com/2015/05/…

You can find each topic playlist here - https://www.youtube.com/user/ramram43…

#java #java annotations #java annotations example #java annotations tutorial for beginners

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

Samanta Moore

1623861240

What is Assertion in Java? How to use Assertion in Java

Table of Contents

What is Assertion in Java?

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

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