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rattatwinko
2025-07-14 00:50:47 +02:00
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.vscode/settings.json vendored Normal file
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{
"java.configuration.updateBuildConfiguration": "automatic"
}

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README.md
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<<<<<<< HEAD
# mvn_MCMANAGE
manage mc servers with java
manage mc servers with java
=======
# Enhanced Minecraft Server Manager
A comprehensive Java Swing application for managing Minecraft Paper servers with automatic JAR downloading, server launching, and console management.
## Features
- **Server Management**: Create and manage multiple Minecraft server instances
- **Paper Integration**: Fetch and download Paper versions automatically from the official API
- **JAR Management**: Automatic downloading of Paper JAR files with latest builds
- **Server Launching**: Start servers with custom RAM allocation and port configuration
- **Console Integration**: Real-time server console output and command input
- **EULA Handling**: Automatic EULA acceptance and server.properties generation
- **Persistent Storage**: JSON-based configuration saving in the root directory
- **Multi-Server Support**: Manage multiple servers simultaneously
## Requirements
- Java 11 or higher
- Maven 3.6 or higher
- Internet connection (for JAR downloads)
## Building the Project
```bash
mvn clean compile
```
## Running the Application
### Option 1: Using Maven
```bash
mvn exec:java
```
### Option 2: Using JAR file
```bash
mvn clean package
java -jar target/minecraft-server-manager-1.0-SNAPSHOT.jar
```
## Usage Guide
### 1. Creating a Server
1. **Fetch Versions**: Click "Fetch Paper Versions" to load available Paper versions
2. **Add Server**: Fill in the server details:
- **Name**: Server instance name
- **Port**: Server port (default: 25565)
- **RAM**: Memory allocation in GB
- **Version**: Select a Paper version from the dropdown
3. **Save**: Click "Save Servers" to persist your configuration
### 2. Setting Up a Server
1. **Select Server**: Choose a server from the list
2. **Download JAR**: Click "Download JAR" to fetch the Paper server JAR
3. **Automatic Setup**: The system will:
- Create server directory structure
- Generate `eula.txt` (automatically accepted)
- Create `server.properties` with your port
- Copy the JAR to the server directory
### 3. Running a Server
1. **Select Server**: Choose the server you want to start
2. **Start Server**: Click "Start Server" to launch the Minecraft server
3. **Monitor Console**: Watch real-time output in the console area
4. **Send Commands**: Use the command field to send server commands
5. **Stop Server**: Click "Stop Server" to shut down the server
## Project Structure
- `Main.java` - Application entry point
- `EnhancedServerManagerUI.java` - Main GUI interface with server management
- `ServerManager.java` - Core server management and JAR downloading logic
- `ServerLocation.java` - Legacy server location model
- `JSONManager.java` - JSON persistence utilities
- `PaperAPIClient.java` - API client for fetching Paper versions
## Directory Structure
```
minecraft-server-manager/
├── servers.json # Legacy server locations
├── server_instances.json # Enhanced server configurations
├── servers/ # Server instance directories
│ ├── server1/
│ │ ├── paper-1.20.1-123.jar
│ │ ├── eula.txt
│ │ ├── server.properties
│ │ └── world/
│ └── server2/
└── jars/ # Downloaded JAR files
├── paper-1.20.1-123.jar
└── paper-1.21.1-456.jar
```
## Server Configuration
### Automatic Files Generated
- **eula.txt**: Automatically set to `eula=true`
- **server.properties**: Basic configuration with your specified port
- **JAR files**: Downloaded from Paper API with latest builds
### Memory Configuration
- **Xmx**: Maximum heap size (RAM GB × 1024 MB)
- **Xms**: Initial heap size (RAM GB × 512 MB)
## API Integration
The application integrates with the official Paper API:
- **Versions**: Fetches available Paper versions
- **Builds**: Downloads latest builds for selected versions
- **JARs**: Automatic JAR file management
## Troubleshooting
### Common Issues
1. **Port Already in Use**: Change the port number in server configuration
2. **Insufficient Memory**: Reduce RAM allocation or close other applications
3. **JAR Download Fails**: Check internet connection and try again
4. **Server Won't Start**: Check console output for specific error messages
### Console Commands
Use the command field to send server commands:
- `stop` - Stop the server gracefully
- `save-all` - Save all worlds
- `list` - List online players
- `op <player>` - Give operator status
- `whitelist add <player>` - Add player to whitelist
## Data Storage
- **Server Configurations**: Stored in `server_instances.json` in the root directory
- **Server Files**: Each server has its own directory under `servers/`
- **JAR Files**: Cached in `jars/` directory to avoid re-downloading
>>>>>>> df9ed6a (first shit)

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>mcmanage</groupId>
<artifactId>minecraft-server-manager</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>minecraft-server-manager</name>
<url>http://maven.apache.org</url>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.13.1</version>
</dependency>
<dependency>
<groupId>com.formdev</groupId>
<artifactId>flatlaf</artifactId>
<version>3.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>11</source>
<target>11</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<archive>
<manifest>
<mainClass>mcmanage.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<mainClass>mcmanage.Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>

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[{"name":"shit","version":"1.12.2","port":25565,"ramGB":8}]

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src/main/java/mcmanage/EnhancedServerManagerUI.java Normal file
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package mcmanage;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.ArrayList;
import java.util.concurrent.ExecutionException;
import com.formdev.flatlaf.FlatLightLaf;
public class EnhancedServerManagerUI extends JFrame {
static {
try {
UIManager.setLookAndFeel(new FlatLightLaf());
} catch (Exception e) {
System.err.println("Failed to initialize FlatLaf");
}
}
private DefaultListModel<ServerManager.ServerInstance> serverListModel = new DefaultListModel<>();
private JList<ServerManager.ServerInstance> serverList = new JList<>(serverListModel);
private JTextField nameField = new JTextField(15);
private JTextField portField = new JTextField(5);
private JTextField ramField = new JTextField(3);
private JComboBox<String> versionsComboBox = new JComboBox<>();
private JButton addButton = new JButton("Add Server");
private JButton saveButton = new JButton("Save Servers");
private JButton fetchVersionsButton = new JButton("Fetch Paper Versions");
private JButton downloadJarButton = new JButton("Download JAR");
private JButton startServerButton = new JButton("Start Server");
private JButton stopServerButton = new JButton("Stop Server");
private JButton sendCommandButton = new JButton("Send Command");
private JTextField commandField = new JTextField(20);
private JTextArea consoleOutput = new JTextArea(20, 60);
private JScrollPane consoleScrollPane = new JScrollPane(consoleOutput);
public EnhancedServerManagerUI() {
super("Enhanced Minecraft Server Manager");
setLayout(new BorderLayout());
// Initialize directories
ServerManager.initializeDirectories();
// Left panel - server list and controls
JPanel leftPanel = new JPanel(new BorderLayout());
// Server list
leftPanel.add(new JLabel("Server Instances:"), BorderLayout.NORTH);
leftPanel.add(new JScrollPane(serverList), BorderLayout.CENTER);
// Control buttons
JPanel controlPanel = new JPanel(new GridLayout(2, 2, 5, 5));
controlPanel.add(startServerButton);
controlPanel.add(stopServerButton);
controlPanel.add(downloadJarButton);
controlPanel.add(sendCommandButton);
leftPanel.add(controlPanel, BorderLayout.SOUTH);
// Right panel - input and console
JPanel rightPanel = new JPanel(new BorderLayout());
// Input panel
JPanel inputPanel = new JPanel();
inputPanel.setLayout(new BoxLayout(inputPanel, BoxLayout.Y_AXIS));
inputPanel.add(new JLabel("Server Name:"));
inputPanel.add(nameField);
inputPanel.add(new JLabel("Port:"));
inputPanel.add(portField);
inputPanel.add(new JLabel("RAM (GB):"));
inputPanel.add(ramField);
inputPanel.add(new JLabel("Paper Version:"));
inputPanel.add(versionsComboBox);
JPanel buttonPanel = new JPanel(new GridLayout(3, 1, 5, 5));
buttonPanel.add(addButton);
buttonPanel.add(saveButton);
buttonPanel.add(fetchVersionsButton);
inputPanel.add(buttonPanel);
rightPanel.add(inputPanel, BorderLayout.NORTH);
// Console panel
JPanel consolePanel = new JPanel(new BorderLayout());
consolePanel.add(new JLabel("Server Console:"), BorderLayout.NORTH);
consolePanel.add(consoleScrollPane, BorderLayout.CENTER);
JPanel commandPanel = new JPanel(new BorderLayout());
commandPanel.add(new JLabel("Command:"), BorderLayout.WEST);
commandPanel.add(commandField, BorderLayout.CENTER);
consolePanel.add(commandPanel, BorderLayout.SOUTH);
rightPanel.add(consolePanel, BorderLayout.CENTER);
add(leftPanel, BorderLayout.WEST);
add(rightPanel, BorderLayout.CENTER);
// Load saved servers
List<ServerManager.ServerInstance> savedServers = JSONManager.loadServerInstances();
savedServers.forEach(serverListModel::addElement);
// Button listeners
addButton.addActionListener(e -> addServer());
saveButton.addActionListener(e -> saveServers());
fetchVersionsButton.addActionListener(e -> fetchVersions());
downloadJarButton.addActionListener(e -> downloadJar());
startServerButton.addActionListener(e -> startServer());
stopServerButton.addActionListener(e -> stopServer());
sendCommandButton.addActionListener(e -> sendCommand());
// Enter key in command field
commandField.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
sendCommand();
}
}
});
// Add tooltips and padding to buttons and fields
addButton.setToolTipText("Add a new server instance");
saveButton.setToolTipText("Save all server configurations");
fetchVersionsButton.setToolTipText("Fetch available PaperMC versions");
downloadJarButton.setToolTipText("Download the selected PaperMC JAR");
startServerButton.setToolTipText("Start the selected server");
stopServerButton.setToolTipText("Send 'stop' command to the selected server");
sendCommandButton.setToolTipText("Send a command to the server console");
nameField.setToolTipText("Server name (used as directory)");
portField.setToolTipText("Server port (default 25565)");
ramField.setToolTipText("RAM in GB (e.g. 2, 4, 8)");
versionsComboBox.setToolTipText("Select PaperMC version");
consoleOutput.setFont(new Font(Font.MONOSPACED, Font.PLAIN, 12));
inputPanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(1200, 800);
setLocationRelativeTo(null);
setVisible(true);
}
private void addServer() {
String name = nameField.getText().trim();
String portStr = portField.getText().trim();
String ramStr = ramField.getText().trim();
String version = (String) versionsComboBox.getSelectedItem();
if (name.isEmpty() || portStr.isEmpty() || ramStr.isEmpty() || version == null) {
JOptionPane.showMessageDialog(this, "Please fill all fields and select a version", "Input Error", JOptionPane.ERROR_MESSAGE);
return;
}
int port, ram;
try {
port = Integer.parseInt(portStr);
ram = Integer.parseInt(ramStr);
} catch (NumberFormatException ex) {
JOptionPane.showMessageDialog(this, "Invalid port or RAM number", "Input Error", JOptionPane.ERROR_MESSAGE);
return;
}
ServerManager.ServerInstance server = new ServerManager.ServerInstance(name, version, port, ram);
serverListModel.addElement(server);
nameField.setText("");
portField.setText("");
ramField.setText("");
}
private void saveServers() {
List<ServerManager.ServerInstance> servers = new ArrayList<>();
for (int i = 0; i < serverListModel.size(); i++) {
servers.add(serverListModel.getElementAt(i));
}
JSONManager.saveServerInstances(servers);
JOptionPane.showMessageDialog(this, "Servers saved!");
}
private void fetchVersions() {
fetchVersionsButton.setEnabled(false);
versionsComboBox.removeAllItems();
SwingWorker<List<String>, Void> worker = new SwingWorker<List<String>, Void>() {
@Override
protected List<String> doInBackground() throws Exception {
return PaperAPIClient.fetchPaperVersions();
}
@Override
protected void done() {
try {
List<String> versions = get();
versions.forEach(versionsComboBox::addItem);
} catch (InterruptedException | ExecutionException e) {
JOptionPane.showMessageDialog(EnhancedServerManagerUI.this, "Failed to fetch versions: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
} finally {
fetchVersionsButton.setEnabled(true);
}
}
};
worker.execute();
}
private void downloadJar() {
ServerManager.ServerInstance selected = serverList.getSelectedValue();
if (selected == null) {
JOptionPane.showMessageDialog(this, "Please select a server first", "Error", JOptionPane.ERROR_MESSAGE);
return;
}
downloadJarButton.setEnabled(false);
consoleOutput.append("Downloading JAR for version " + selected.version + "...\n");
SwingWorker<String, Void> worker = new SwingWorker<String, Void>() {
@Override
protected String doInBackground() throws Exception {
return ServerManager.downloadPaperJar(selected.version);
}
@Override
protected void done() {
try {
String jarPath = get();
selected.jarPath = jarPath;
consoleOutput.append("JAR downloaded successfully: " + jarPath + "\n");
// Setup server directory
ServerManager.setupServerDirectory(selected);
consoleOutput.append("Server directory setup complete for: " + selected.name + "\n");
} catch (Exception e) {
consoleOutput.append("Error downloading JAR: " + e.getMessage() + "\n");
e.printStackTrace();
} finally {
downloadJarButton.setEnabled(true);
}
}
};
worker.execute();
}
private void startServer() {
ServerManager.ServerInstance selected = serverList.getSelectedValue();
if (selected == null) {
JOptionPane.showMessageDialog(this, "Please select a server first", "Error", JOptionPane.ERROR_MESSAGE);
return;
}
if (selected.jarPath == null || selected.jarPath.isEmpty()) {
JOptionPane.showMessageDialog(this, "Please download the JAR first", "Error", JOptionPane.ERROR_MESSAGE);
return;
}
startServerButton.setEnabled(false);
consoleOutput.append("Starting server: " + selected.name + "\n");
SwingWorker<Void, Void> worker = new SwingWorker<Void, Void>() {
@Override
protected Void doInBackground() throws Exception {
ServerManager.startServer(selected, consoleOutput);
return null;
}
@Override
protected void done() {
try {
get();
} catch (Exception e) {
consoleOutput.append("Error starting server: " + e.getMessage() + "\n");
e.printStackTrace();
} finally {
startServerButton.setEnabled(true);
}
}
};
worker.execute();
}
private void stopServer() {
ServerManager.ServerInstance selected = serverList.getSelectedValue();
if (selected == null) {
JOptionPane.showMessageDialog(this, "Please select a server first", "Error", JOptionPane.ERROR_MESSAGE);
return;
}
ServerManager.stopServer(selected);
consoleOutput.append("Stopping server: " + selected.name + "\n");
}
private void sendCommand() {
ServerManager.ServerInstance selected = serverList.getSelectedValue();
if (selected == null) {
JOptionPane.showMessageDialog(this, "Please select a server first", "Error", JOptionPane.ERROR_MESSAGE);
return;
}
String command = commandField.getText().trim();
if (command.isEmpty()) {
return;
}
ServerManager.sendCommand(selected, command);
consoleOutput.append("> " + command + "\n");
commandField.setText("");
}
public static void main(String[] args) {
SwingUtilities.invokeLater(EnhancedServerManagerUI::new);
}
}

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src/main/java/mcmanage/JSONManager.java Normal file
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package mcmanage;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.io.File;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
public class JSONManager {
private static final String FILE = "servers.json";
public static List<ServerLocation> load() {
File file = new File(FILE);
if (!file.exists()) {
return new ArrayList<>();
}
try (Reader reader = new FileReader(file)) {
Gson gson = new Gson();
Type listType = new TypeToken<List<ServerLocation>>(){}.getType();
return gson.fromJson(reader, listType);
} catch (IOException e) {
e.printStackTrace();
return new ArrayList<>();
}
}
public static void save(List<ServerLocation> servers) {
try (Writer writer = new FileWriter(FILE)) {
Gson gson = new Gson();
gson.toJson(servers, writer);
} catch (IOException e) {
e.printStackTrace();
}
}
public static List<ServerManager.ServerInstance> loadServerInstances() {
File file = new File("server_instances.json");
if (!file.exists() || file.length() == 0) {
return new ArrayList<>();
}
try (Reader reader = new FileReader(file)) {
Gson gson = new Gson();
Type listType = new TypeToken<List<ServerManager.ServerInstance>>(){}.getType();
List<ServerManager.ServerInstance> list = gson.fromJson(reader, listType);
return list != null ? list : new ArrayList<>();
} catch (Exception e) {
e.printStackTrace();
// If parsing fails, return an empty list and optionally log a warning
return new ArrayList<>();
}
}
public static void saveServerInstances(List<ServerManager.ServerInstance> servers) {
File tempFile = new File("server_instances.json.tmp");
File targetFile = new File("server_instances.json");
try (Writer writer = new FileWriter(tempFile)) {
Gson gson = new Gson();
gson.toJson(servers != null ? servers : new ArrayList<>(), writer);
} catch (IOException e) {
e.printStackTrace();
return;
}
// Atomic move to avoid partial/corrupt files
if (!tempFile.renameTo(targetFile)) {
System.err.println("Failed to rename temp file to server_instances.json");
}
}
}

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package mcmanage;
import javax.swing.SwingUtilities;
public class Main
{
public static void main( String[] args )
{
SwingUtilities.invokeLater(() -> new EnhancedServerManagerUI());
}
}

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src/main/java/mcmanage/PaperAPIClient.java Normal file
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package mcmanage;
import com.google.gson.*;
import java.io.IOException;
import java.net.URI;
import java.net.http.*;
import java.util.ArrayList;
import java.util.List;
public class PaperAPIClient {
private static final String API_URL = "https://api.papermc.io/v2/projects/paper";
public static List<String> fetchPaperVersions() throws IOException, InterruptedException {
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(API_URL))
.GET()
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
List<String> versions = new ArrayList<>();
if (response.statusCode() == 200) {
try {
JsonObject json = JsonParser.parseString(response.body()).getAsJsonObject();
if (json.has("versions")) {
JsonArray versionsJson = json.getAsJsonArray("versions");
for (JsonElement v : versionsJson) {
String version = v.getAsString();
versions.add(version);
}
}
} catch (Exception e) {
System.err.println("Error parsing JSON: " + e.getMessage());
e.printStackTrace();
}
} else {
System.err.println("HTTP Error: " + response.statusCode());
}
return versions;
}
}

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src/main/java/mcmanage/ServerLocation.java Normal file
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package mcmanage;
public class ServerLocation {
public String name;
public String ip;
public int port;
public ServerLocation(String name, String ip, int port) {
this.name = name;
this.ip = ip;
this.port = port;
}
@Override
public String toString() {
return name + " (" + ip + ":" + port + ")";
}
}

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package mcmanage;
import java.io.*;
import java.net.URI;
import java.net.http.*;
import java.nio.file.*;
import java.util.*;
import java.util.concurrent.*;
import javax.swing.*;
public class ServerManager {
private static final String PAPER_API_BASE = "https://api.papermc.io/v2/projects/paper";
private static final String SERVERS_DIR = "servers";
private static final String JARS_DIR = "jars";
public static class ServerInstance {
public String name;
public String version;
public int port;
public int ramGB;
public String jarPath;
public transient Process process;
public transient BufferedReader consoleReader;
public transient boolean isRunning;
public ServerInstance(String name, String version, int port, int ramGB) {
this.name = name;
this.version = version;
this.port = port;
this.ramGB = ramGB;
this.isRunning = false;
}
@Override
public String toString() {
String status = isRunning ? " [RUNNING]" : " [STOPPED]";
return name + " (" + version + ":" + port + ", " + ramGB + "GB)" + status;
}
}
public static void initializeDirectories() {
try {
Files.createDirectories(Paths.get(SERVERS_DIR));
Files.createDirectories(Paths.get(JARS_DIR));
} catch (IOException e) {
System.err.println("Error creating directories: " + e.getMessage());
}
}
public static String downloadPaperJar(String version) throws IOException, InterruptedException {
// First, get the builds for the version
String buildsUrl = PAPER_API_BASE + "/versions/" + version + "/builds";
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(buildsUrl))
.GET()
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() != 200) {
throw new IOException("Failed to get builds for version " + version + ": " + response.statusCode());
}
// Parse the builds response to get the latest build number
com.google.gson.JsonObject buildsJson = com.google.gson.JsonParser.parseString(response.body()).getAsJsonObject();
com.google.gson.JsonArray builds = buildsJson.getAsJsonArray("builds");
if (builds.size() == 0) {
throw new IOException("No builds found for version " + version);
}
// Get the latest build (last in the array)
com.google.gson.JsonObject latestBuild = builds.get(builds.size() - 1).getAsJsonObject();
int buildNumber = latestBuild.get("build").getAsInt();
// Download the JAR
String jarName = "paper-" + version + "-" + buildNumber + ".jar";
String jarUrl = PAPER_API_BASE + "/versions/" + version + "/builds/" + buildNumber + "/downloads/" + jarName;
String jarPath = JARS_DIR + "/" + jarName;
Path jarFile = Paths.get(jarPath);
if (Files.exists(jarFile)) {
System.out.println("JAR already exists: " + jarPath);
return jarPath;
}
System.out.println("Downloading JAR: " + jarUrl);
HttpRequest downloadRequest = HttpRequest.newBuilder()
.uri(URI.create(jarUrl))
.GET()
.build();
HttpResponse<InputStream> downloadResponse = client.send(downloadRequest, HttpResponse.BodyHandlers.ofInputStream());
if (downloadResponse.statusCode() != 200) {
throw new IOException("Failed to download JAR: " + downloadResponse.statusCode());
}
Files.copy(downloadResponse.body(), jarFile, StandardCopyOption.REPLACE_EXISTING);
System.out.println("Downloaded JAR to: " + jarPath);
return jarPath;
}
public static void setupServerDirectory(ServerInstance server) throws IOException {
String serverDir = SERVERS_DIR + "/" + server.name;
Path serverPath = Paths.get(serverDir);
Files.createDirectories(serverPath);
// Copy JAR to server directory
Path jarSource = Paths.get(server.jarPath);
Path jarDest = serverPath.resolve(jarSource.getFileName());
Files.copy(jarSource, jarDest, StandardCopyOption.REPLACE_EXISTING);
// Create eula.txt if it doesn't exist
Path eulaFile = serverPath.resolve("eula.txt");
if (!Files.exists(eulaFile)) {
String eulaContent = "#By changing the setting below to TRUE you are indicating your agreement to our EULA (https://account.mojang.com/documents/minecraft_eula).\n" +
"#Generated on " + new Date() + "\n" +
"eula=true\n";
Files.write(eulaFile, eulaContent.getBytes());
System.out.println("Created eula.txt for server: " + server.name);
}
// Create server.properties if it doesn't exist
Path propertiesFile = serverPath.resolve("server.properties");
if (!Files.exists(propertiesFile)) {
String propertiesContent = "#Minecraft server properties\n" +
"#Generated on " + new Date() + "\n" +
"server-port=" + server.port + "\n" +
"gamemode=survival\n" +
"difficulty=easy\n" +
"max-players=20\n" +
"online-mode=false\n" +
"enable-command-block=false\n" +
"spawn-protection=16\n";
Files.write(propertiesFile, propertiesContent.getBytes());
System.out.println("Created server.properties for server: " + server.name);
}
}
public static void startServer(ServerInstance server, JTextArea consoleOutput) throws IOException {
if (server.isRunning) {
consoleOutput.append("Server " + server.name + " is already running!\n");
return;
}
String serverDir = SERVERS_DIR + "/" + server.name;
Path jarFile = Paths.get(serverDir).resolve(Paths.get(server.jarPath).getFileName());
if (!Files.exists(jarFile)) {
throw new IOException("Server JAR not found: " + jarFile);
}
// Build the command
List<String> command = new ArrayList<>();
command.add("java");
command.add("-Xmx" + (server.ramGB * 1024) + "M");
command.add("-Xms" + (server.ramGB * 512) + "M");
command.add("-jar");
command.add(jarFile.toAbsolutePath().toString());
command.add("nogui");
ProcessBuilder pb = new ProcessBuilder(command);
pb.directory(new File(serverDir));
pb.redirectErrorStream(true);
consoleOutput.append("Starting server " + server.name + " with " + server.ramGB + "GB RAM...\n");
consoleOutput.append("Command: " + String.join(" ", command) + "\n");
server.process = pb.start();
server.isRunning = true;
// Start console reader
server.consoleReader = new BufferedReader(new InputStreamReader(server.process.getInputStream()));
// Start a thread to read console output
CompletableFuture.runAsync(() -> {
try {
String line;
while ((line = server.consoleReader.readLine()) != null) {
final String outputLine = line;
SwingUtilities.invokeLater(() -> {
consoleOutput.append(outputLine + "\n");
consoleOutput.setCaretPosition(consoleOutput.getDocument().getLength());
});
}
} catch (IOException e) {
System.err.println("Error reading console output: " + e.getMessage());
} finally {
server.isRunning = false;
SwingUtilities.invokeLater(() -> {
consoleOutput.append("Server " + server.name + " has stopped.\n");
});
}
});
}
public static void stopServer(ServerInstance server) {
if (server.process != null && server.isRunning) {
try {
PrintWriter writer = new PrintWriter(server.process.getOutputStream(), true);
writer.println("stop");
writer.flush();
System.out.println("Sent 'stop' command to server: " + server.name);
} catch (Exception e) {
System.err.println("Error sending 'stop' command: " + e.getMessage());
}
}
}
public static void sendCommand(ServerInstance server, String command) {
if (server.process != null && server.isRunning) {
try {
PrintWriter writer = new PrintWriter(server.process.getOutputStream());
writer.println(command);
writer.flush();
} catch (Exception e) {
System.err.println("Error sending command: " + e.getMessage());
}
}
}
}

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package mcmanage;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.ArrayList;
import java.util.concurrent.ExecutionException;
public class ServerManagerUI extends JFrame {
private DefaultListModel<ServerLocation> serverListModel = new DefaultListModel<>();
private JList<ServerLocation> serverList = new JList<>(serverListModel);
private JTextField nameField = new JTextField(15);
private JTextField ipField = new JTextField(15);
private JTextField portField = new JTextField(5);
private JButton addButton = new JButton("Add Server");
private JButton saveButton = new JButton("Save Servers");
private JButton fetchVersionsButton = new JButton("Fetch Paper Versions");
private JComboBox<String> versionsComboBox = new JComboBox<>();
public ServerManagerUI() {
super("Minecraft Server Manager");
setLayout(new BorderLayout());
// Left panel - list of servers
JPanel leftPanel = new JPanel(new BorderLayout());
leftPanel.add(new JLabel("Saved Servers:"), BorderLayout.NORTH);
leftPanel.add(new JScrollPane(serverList), BorderLayout.CENTER);
// Right panel - input and buttons
JPanel rightPanel = new JPanel();
rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.Y_AXIS));
rightPanel.add(new JLabel("Name:"));
rightPanel.add(nameField);
rightPanel.add(new JLabel("IP Address:"));
rightPanel.add(ipField);
rightPanel.add(new JLabel("Port:"));
rightPanel.add(portField);
rightPanel.add(addButton);
rightPanel.add(saveButton);
rightPanel.add(new JLabel("Paper Versions:"));
rightPanel.add(versionsComboBox);
rightPanel.add(fetchVersionsButton);
add(leftPanel, BorderLayout.CENTER);
add(rightPanel, BorderLayout.EAST);
// Load saved servers
List<ServerLocation> savedServers = JSONManager.load();
savedServers.forEach(serverListModel::addElement);
// Button listeners
addButton.addActionListener(e -> addServer());
saveButton.addActionListener(e -> saveServers());
fetchVersionsButton.addActionListener(e -> fetchVersions());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(600, 400);
setLocationRelativeTo(null);
setVisible(true);
}
private void addServer() {
String name = nameField.getText().trim();
String ip = ipField.getText().trim();
String portStr = portField.getText().trim();
if (name.isEmpty() || ip.isEmpty() || portStr.isEmpty()) {
JOptionPane.showMessageDialog(this, "Please fill all fields", "Input Error", JOptionPane.ERROR_MESSAGE);
return;
}
int port;
try {
port = Integer.parseInt(portStr);
} catch (NumberFormatException ex) {
JOptionPane.showMessageDialog(this, "Invalid port number", "Input Error", JOptionPane.ERROR_MESSAGE);
return;
}
ServerLocation server = new ServerLocation(name, ip, port);
serverListModel.addElement(server);
nameField.setText("");
ipField.setText("");
portField.setText("");
}
private void saveServers() {
List<ServerLocation> servers = new ArrayList<>();
for (int i = 0; i < serverListModel.size(); i++) {
servers.add(serverListModel.getElementAt(i));
}
JSONManager.save(servers);
JOptionPane.showMessageDialog(this, "Servers saved!");
}
private void fetchVersions() {
System.out.println("Fetch versions button clicked");
fetchVersionsButton.setEnabled(false);
versionsComboBox.removeAllItems();
SwingWorker<List<String>, Void> worker = new SwingWorker<List<String>, Void>() {
@Override
protected List<String> doInBackground() throws Exception {
System.out.println("Starting background task to fetch versions");
List<String> versions = PaperAPIClient.fetchPaperVersions();
System.out.println("Background task completed, fetched " + versions.size() + " versions");
return versions;
}
@Override
protected void done() {
try {
System.out.println("SwingWorker done() called");
List<String> versions = get();
System.out.println("Retrieved " + versions.size() + " versions from SwingWorker");
versions.forEach(versionsComboBox::addItem);
System.out.println("Added " + versions.size() + " items to combo box");
} catch (InterruptedException | ExecutionException e) {
System.err.println("Error in SwingWorker done(): " + e.getMessage());
e.printStackTrace();
JOptionPane.showMessageDialog(ServerManagerUI.this, "Failed to fetch versions: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
} finally {
fetchVersionsButton.setEnabled(true);
System.out.println("Fetch versions button re-enabled");
}
}
};
worker.execute();
System.out.println("SwingWorker executed");
}
public static void main(String[] args) {
SwingUtilities.invokeLater(ServerManagerUI::new);
}
}

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package mcmanage;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* Unit test for simple App.
*/
public class AppTest
extends TestCase
{
/**
* Create the test case
*
* @param testName name of the test case
*/
public AppTest( String testName )
{
super( testName );
}
/**
* @return the suite of tests being tested
*/
public static Test suite()
{
return new TestSuite( AppTest.class );
}
/**
* Rigourous Test :-)
*/
public void testApp()
{
assertTrue( true );
}
}

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## Step 1: Set up your project
* Use Java 11 or higher (for built-in HttpClient)
* Add **Gson** to your build:
* If using Maven or Gradle, add Gson as explained before.
* If plain, download gson JAR and add it to classpath.
* Create your package, e.g., `mcmanage`.
---
## Step 2: Create ServerLocation class
```java
package mcmanage;
public class ServerLocation {
public String name;
public String ip;
public int port;
public ServerLocation(String name, String ip, int port) {
this.name = name;
this.ip = ip;
this.port = port;
}
@Override
public String toString() {
return name + " (" + ip + ":" + port + ")";
}
}
```
---
## Step 3: Create JSON utility to load/save server locations
```java
package mcmanage;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.io.*;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
public class ServerLocationStorage {
private static final String FILE = "servers.json";
public static List<ServerLocation> load() {
File file = new File(FILE);
if (!file.exists()) {
return new ArrayList<>();
}
try (Reader reader = new FileReader(file)) {
Gson gson = new Gson();
Type listType = new TypeToken<List<ServerLocation>>(){}.getType();
return gson.fromJson(reader, listType);
} catch (IOException e) {
e.printStackTrace();
return new ArrayList<>();
}
}
public static void save(List<ServerLocation> servers) {
try (Writer writer = new FileWriter(FILE)) {
Gson gson = new Gson();
gson.toJson(servers, writer);
} catch (IOException e) {
e.printStackTrace();
}
}
}
```
---
## Step 4: Create PaperAPI client to fetch versions
```java
package mcmanage;
import com.google.gson.*;
import java.io.IOException;
import java.net.URI;
import java.net.http.*;
import java.util.ArrayList;
import java.util.List;
public class PaperAPIClient {
private static final String API_URL = "https://api.papermc.io/v2/projects/paper";
public static List<String> fetchPaperVersions() throws IOException, InterruptedException {
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(API_URL))
.GET()
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
List<String> versions = new ArrayList<>();
if (response.statusCode() == 200) {
JsonObject json = JsonParser.parseString(response.body()).getAsJsonObject();
JsonArray versionsJson = json.getAsJsonArray("versions");
for (JsonElement v : versionsJson) {
versions.add(v.getAsString());
}
}
return versions;
}
}
```
---
## Step 5: Build the Swing GUI
```java
package mcmanage;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.concurrent.ExecutionException;
public class ServerManagerUI extends JFrame {
private DefaultListModel<ServerLocation> serverListModel = new DefaultListModel<>();
private JList<ServerLocation> serverList = new JList<>(serverListModel);
private JTextField nameField = new JTextField(15);
private JTextField ipField = new JTextField(15);
private JTextField portField = new JTextField(5);
private JButton addButton = new JButton("Add Server");
private JButton saveButton = new JButton("Save Servers");
private JButton fetchVersionsButton = new JButton("Fetch Paper Versions");
private JComboBox<String> versionsComboBox = new JComboBox<>();
public ServerManagerUI() {
super("Minecraft Server Manager");
setLayout(new BorderLayout());
// Left panel - list of servers
JPanel leftPanel = new JPanel(new BorderLayout());
leftPanel.add(new JLabel("Saved Servers:"), BorderLayout.NORTH);
leftPanel.add(new JScrollPane(serverList), BorderLayout.CENTER);
// Right panel - input and buttons
JPanel rightPanel = new JPanel();
rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.Y_AXIS));
rightPanel.add(new JLabel("Name:"));
rightPanel.add(nameField);
rightPanel.add(new JLabel("IP Address:"));
rightPanel.add(ipField);
rightPanel.add(new JLabel("Port:"));
rightPanel.add(portField);
rightPanel.add(addButton);
rightPanel.add(saveButton);
rightPanel.add(new JLabel("Paper Versions:"));
rightPanel.add(versionsComboBox);
rightPanel.add(fetchVersionsButton);
add(leftPanel, BorderLayout.CENTER);
add(rightPanel, BorderLayout.EAST);
// Load saved servers
List<ServerLocation> savedServers = ServerLocationStorage.load();
savedServers.forEach(serverListModel::addElement);
// Button listeners
addButton.addActionListener(e -> addServer());
saveButton.addActionListener(e -> saveServers());
fetchVersionsButton.addActionListener(e -> fetchVersions());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(600, 400);
setLocationRelativeTo(null);
setVisible(true);
}
private void addServer() {
String name = nameField.getText().trim();
String ip = ipField.getText().trim();
String portStr = portField.getText().trim();
if (name.isEmpty() || ip.isEmpty() || portStr.isEmpty()) {
JOptionPane.showMessageDialog(this, "Please fill all fields", "Input Error", JOptionPane.ERROR_MESSAGE);
return;
}
int port;
try {
port = Integer.parseInt(portStr);
} catch (NumberFormatException ex) {
JOptionPane.showMessageDialog(this, "Invalid port number", "Input Error", JOptionPane.ERROR_MESSAGE);
return;
}
ServerLocation server = new ServerLocation(name, ip, port);
serverListModel.addElement(server);
nameField.setText("");
ipField.setText("");
portField.setText("");
}
private void saveServers() {
List<ServerLocation> servers = serverListModel.elements().asIterator().toList();
ServerLocationStorage.save(servers);
JOptionPane.showMessageDialog(this, "Servers saved!");
}
private void fetchVersions() {
fetchVersionsButton.setEnabled(false);
versionsComboBox.removeAllItems();
SwingWorker<List<String>, Void> worker = new SwingWorker<>() {
@Override
protected List<String> doInBackground() throws Exception {
return PaperAPIClient.fetchPaperVersions();
}
@Override
protected void done() {
try {
List<String> versions = get();
versions.forEach(versionsComboBox::addItem);
} catch (InterruptedException | ExecutionException e) {
JOptionPane.showMessageDialog(ServerManagerUI.this, "Failed to fetch versions", "Error", JOptionPane.ERROR_MESSAGE);
} finally {
fetchVersionsButton.setEnabled(true);
}
}
};
worker.execute();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(ServerManagerUI::new);
}
}
```
---
## Step 6: Run & test
* Launch your `ServerManagerUI` main class.
* Add servers manually and save them.
* Click “Fetch Paper Versions” to load versions from Paper API.
* The versions appear in the combo box dynamically.
---
## Summary
* You have JSON save/load with Gson.
* You fetch Paper versions dynamically using Java 11 HttpClient.
* You use Swing for a simple GUI to manage your servers and versions.
---

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mcmanage/ServerManager.class
mcmanage/JSONManager$1.class
mcmanage/EnhancedServerManagerUI$2.class
mcmanage/ServerManagerUI$1.class
mcmanage/EnhancedServerManagerUI$1.class
mcmanage/JSONManager.class
mcmanage/JSONManager$2.class
mcmanage/EnhancedServerManagerUI.class
mcmanage/PaperAPIClient.class
mcmanage/Main.class
mcmanage/EnhancedServerManagerUI$4.class
mcmanage/ServerLocation.class
mcmanage/ServerManagerUI.class
mcmanage/EnhancedServerManagerUI$3.class
mcmanage/ServerManager$ServerInstance.class

7
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/home/rattatwinko/Documents/gitproj/mvn_MCMANAGE/src/main/java/mcmanage/JSONManager.java
/home/rattatwinko/Documents/gitproj/mvn_MCMANAGE/src/main/java/mcmanage/ServerLocation.java
/home/rattatwinko/Documents/gitproj/mvn_MCMANAGE/src/main/java/mcmanage/ServerManager.java
/home/rattatwinko/Documents/gitproj/mvn_MCMANAGE/src/main/java/mcmanage/ServerManagerUI.java
/home/rattatwinko/Documents/gitproj/mvn_MCMANAGE/src/main/java/mcmanage/EnhancedServerManagerUI.java
/home/rattatwinko/Documents/gitproj/mvn_MCMANAGE/src/main/java/mcmanage/PaperAPIClient.java
/home/rattatwinko/Documents/gitproj/mvn_MCMANAGE/src/main/java/mcmanage/Main.java