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Log4j Date Format Example

This article is a tutorial about date format patterns in Log4j. In this tutorial, we are going to configure log4j via property files. 1. Introduction Log4J (Java) is a widely used logging framework for Java. It continues to grow continuously with the recent upgrade to Log4j2. Log4j supports logging via Logger, Appender and Layouts. Logger is the interaction point for ...

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MongoDB Logical Query Operators Example

Hello readers, in this tutorial, we will understand the different logical query operators available in the Mongo database. Let’s study in brief the different ways in which these operators can be used. 1. Introduction If you have installed the MongoDB application on Windows or Ubuntu operating system and you wish to learn the logical query operators then follow the below ...

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Vaadin Spring Security Example

1. Introduction Vaadin is a web application framework written in Java, and is built on Google Web Toolkit from Vaadin Ltd. Spring Security is a part of Spring framework that focuses on providing both authentication and authorization to Java applications. Both Vaadin and Spring Security are open sourced and licensed under the Apache 2.0 license. In this example, we will build a web application in ...

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Spring Boot and JPA Example

Are you keen on learning about using Spring Boot with JPA? Yes? Gather your tools and read on. This example is very straight forward and simple, it should be easy to understand. Let’s begin with our Spring Boot JPA example. 1. Tools Apache Maven Mars Eclipse Spring Boot Spring Data JPA H2 Database Engine 2. Assumptions This article assumes that ...

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MongoDB Comparison Query Operators Example

Hello readers, in this tutorial, we will understand the different comparison query operators available in the Mongo database. Let’s study in brief the different ways in which these operators can be used. 1. Introduction If you have installed the MongoDB application on Windows or Ubuntu operating system and you wish to learn the comparison query operators then follow the below ...

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Most Popular Git Commands with Examples

1. Introduction GIT is a popular versioning system accepted and used throughout the world. GIT based versioning can be managed using either command line or GUI tools available for every operating system. However, developers have highly preferred to use command line tools for hassle-free versioning. This article is a one-stop guide for almost every GIT command that you would need ...

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MongoDB Array Query Operators Example

Hello readers, in this tutorial, we will see the different array query operators in the Mongo database. Let’s study in brief the different ways in which these operators can be used. 1. Introduction If you have installed the MongoDB application on Windows or Ubuntu operating system and you wish to learn the Array Query operators, then follow the below steps. ...

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MongoDB Delete Collection Example

Hello readers, in this tutorial, we will see how to delete a collection in MongoDB. Let’s study in brief the different ways in which a MongoDB collection can be deleted. 1. Introduction If you have installed the MongoDB application on Windows or Ubuntu operating system and you wish to learn about the delete operations then follow the below steps. It’s ...

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Log4j ImmediateFlush Property Example

This article is a tutorial about log priority levels in Log4j. In this tutorial, we are going to configure log4j via property files. 1. Introduction Log4J (Java) is a widely used logging framework for Java. It continues to grow continuously with the recent upgrade to Log4j2. Log4j supports logging via Logger, Appender and Layouts. Logger is the interaction point for ...

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MongoDB Backup and Restore Example

Hello readers, these days it is very important to protect the data against any damage if a disaster or the unforeseen outages. Thus, irrespective of the database type, it is important to keep up the regular data backups to make data available during the server crash or data corruption. In this tutorial, we will see how to use the Backup ...

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