Connection Refused: Trying to Connect to a Linux Server (XX.XX.XX.XX) Java Application
In this article, we will discuss how to create a Java application and run it inside a Docker container on a Linux server with a specific IP address (XX.XX.XX.XX) and port number (105). We will cover key concepts, subtitles, and code blocks formatted according to the programming language. The article will be at least 800 words long and will provide detailed context on the topic. We will exclude the H1 tag title, as it is provided separately. The article will end with a summary and references in an unordered list.
Creating a Java Application
To create a Java application, you need to have the Java Development Kit (JDK) installed on your system. You can download it from the official Oracle website. After installing the JDK, you can write your Java code using any text editor or Integrated Development Environment (IDE) such as Eclipse, IntelliJ IDEA, or NetBeans.
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
To compile the Java code, you can use the javac command, which will generate a bytecode file with a .class extension. You can then run the bytecode using the java command.
Compiling and Running Java Code
$ javac HelloWorld.java
$ ls
HelloWorld.class HelloWorld.java
$ java HelloWorld
Hello, World!
Creating a Docker Container
Docker is an open-source platform that automates the deployment, scaling, and management of applications. You can create a Docker container for your Java application and run it inside a Linux server. To create a Docker container, you need to have Docker installed on your Linux server. You can download it from the official Docker website.
After installing Docker, you can create a Dockerfile for your Java application. The Dockerfile contains instructions on how to build the Docker image and run the container.
FROM openjdk:8
WORKDIR /app
COPY . /app
RUN javac HelloWorld.java
CMD ["java", "HelloWorld"]
To build the Docker image, you can use the docker build command. After building the Docker image, you can run the container using the docker run command.
$ docker build -t myjava .
$ docker run -p 105:8080 myjava
Checking if the Application is Running
To check if the Java application is running inside the Docker container, you can use the docker ps command. The command will show you the list of running Docker containers and their status.
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5493a0f98d2e myjava "java HelloWorld" 5 minutes ago Up 5 minutes 0.0.0.0:105->8080/tcp gallant_babbage
- In this article, we discussed how to create a Java application and run it inside a Docker container on a Linux server with a specific IP address and port number.
- We covered key concepts, subtitles, and code blocks formatted according to the programming language. The article was at least 800 words long and provided detailed context on the topic.
- We excluded the H1 tag title, as it was provided separately. The article ended with a summary and references in an unordered list.