Solved: launch minecraft server command

Creating a Minecraft server can be a rewarding endeavor. Not only do you have the freedom to customize your own gameplay experience, but you also have the chance to share your creation with other players. This tutorial will guide you through the steps of launching a Minecraft server command and delve into the intricacies of the coding involved. This will include the exploration of different libraries and various functions that are integral part of this process.

The first step to launch a Minecraft server command is understanding what a server command in Minecraft is. Minecraft uses several command line operations to manage servers. For instance, the “java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui” command is used to start the server without the GUI.

The Server Command Structure

A typical server command comprises different sections. Let’s take the server launch command above as an example.

java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui

In this command:

  • Java: This invokes your server’s Java Runtime Environment (JRE).
  • -Xmx1024M -Xms1024M: These flags set the maximum (-Xmx) and initial (-Xms) amount of memory that’s allocated to Java.
  • -jar: This tells the command line to run the following .jar file.
  • minecraft_server.jar: This is the actual server software.
  • nogui: This tells the server not to display the graphical user interface (GUI).

Understanding each part of the command offers a lot of flexibility and helps you troubleshoot issues that may arise during the creation and maintenance of your Minecraft server.

Step-by-Step Code Explanation

Let’s create a basic Java program to start a Minecraft server with a specific amount of memory.


public class Main {
public static void main(String[] args) {
    try {
        ProcessBuilder pb = new ProcessBuilder("java", "-Xmx1024M", "-Xms1024M", "-jar", "minecraft_server.jar", "nogui");
        Process process = pb.start();

        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));

        String line;
        while ((line = reader.readLine()) != null) {


    } catch (IOException | InterruptedException e) {

In this block of code, the ProcessBuilder class is being used to start a new process – in this case, the Minecraft server. I/O operations, such as reading the server’s output and waiting for the process to terminate, are handled via the Process object and various I/O classes.

Libraries and Functions Involved

Libraries and functions are crucial in the server creation process.

In the provided code, the library is imported, which provides classes for system input and output through data streams, serialization, and the file system. ProcessBuilder is a useful class in this library and is used to create operating system processes.

Each function performs a specific task, contributing to the seamless operation of the server. The main function initiates the program. The ProcessBuilder function executes the server command. Commands like process.waitFor() cause the current thread to wait until the process has terminated.

It’s important to understand these libraries and functions to manipulate server commands, customize server settings, and troubleshoot any issues that can occur in the process of making a Minecraft server.

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