Inversion of control(IOC) and Dependency Injection(DI) in Spring Framework

In this tutorial, we will learn the basic concept of Inversion of control and Dependency Injection. The core of the spring framework is based on the IOC principle. IOC and DI are closely related concepts. They describe the different aspects of how the spring manages the objects and their interaction. Let's look into each concept. Inversion of Control(IOC) IOC is a design principle where the control...

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How to install oracle database on Ubuntu system with Docker

In this tutorial, we are going to learn how to install the Oracle database on the Ubuntu system. - Prerequisites Docker needs to be installed on the system to verify it use the following command docker --version This will list the docker version installed elint@elint:~$ docker --version Docker version...

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How to remove docker containers and images

In this tutorial, we are going to learn how to remove the docker containers and images Initially, list all the containers that use the docker images. To see all the running containers on your machine use the following command docker ps -a This will show all the running containers on your machine. The...

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How to install and start Redis server for Ubuntu system

If the Redis server is not installed on the system install it. For the Ubuntu system use the following command sudo apt-get update sudo apt-get install redis-server Once the Redis server is installed, open the terminal and start it using the following command redis-server This will start the Redis server. Note: with this redis server will start on default port 6379. To customize the configuration...

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Caused by java.io.IOException: CreateProcess error=206, The filename or extension is too long

While working on Java gradle project sometimes we might get the following error in Windows system: Caused by: java.io.IOException: CreateProcess error=206, The filename or extension is too long This is due to when classpath for a Gradle JavaExec or Test task is long, Windows command executions give an error because of the limitation to command line length greater than 32K With a number of classpath...

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How to setup auto renewable free SSL certificate using Lets Encrypt and Nginx on Ubuntu machine

In this tutorial, we are going to set up free SSL auto-renewable Let's Encrypt along with Nginx. Prerequisites: Before we start setup, first make sure your domain e.g. example.com is pointed to the server's public IP address. You can set up and point this configuration from the dashboard of your domain...

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Mail Sending Issue in Java Application

Sometimes while sending the mail in the Java application we might get the following issue. org.springframework.mail.MailSendException: Mail server connection failed; nested exception is com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1; nested...

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Convert Date to Pretty Time in Grails and Groovy

In this tutorial, we will learn how to convert Java Date to pretty time like moments ago, 1 hour ago, 1 week ago, 1 month ago, 1 year ago, and so on in grails application. For this, we are using the prettytime plugin in our project. Load PrettyTime in Grails Gradle project: Add the following inside dependencies in the build.gradle file. dependencies { //other dependencies compile 'org.grails.plugins:grails-pretty-time:4.0.0' } PrettyTime...

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Convert Java Date to Pretty Time in Java

In this tutorial, we will learn how to convert Java Date to pretty time like moments ago, 1 hour ago, 1 week ago, 1 month ago, 1 year ago, and so on. For this, we are using the prettytime dependency in our project. If we are using a jar file download the desired jar file from the Maven repository and load the jar file in the application. Please follow How to add external jar or library on IntelliJ...

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Java format date string to date and vice versa

This is a quick tutorial on formatting date in the string to java Date and Date to a date in string. Let's create a sample Java class called DateTimeUtils.java. Parse Date String to Date: Let's look into the example that we want to parse the date string 2022-08-22 or 2022-08-22 04:22:100 to Date. import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class...

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