I started a project, wrote an arson system

.gitignore

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+# User-specific stuff
+.idea/
+
+*.iml
+*.ipr
+*.iws
+
+# IntelliJ
+out/
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+target/
+
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+.flattened-pom.xml
+
+# Common working directory
+run/

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.dmitrium12</groupId>
+    <artifactId>Sunburn</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+
+    <name>Sunburn</name>
+
+    <properties>
+        <java.version>21</java.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <build>
+        <defaultGoal>clean package</defaultGoal>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.13.0</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.5.3</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <repositories>
+        <repository>
+            <id>papermc-repo</id>
+            <url>https://repo.papermc.io/repository/maven-public/</url>
+        </repository>
+        <repository>
+            <id>sonatype</id>
+            <url>https://oss.sonatype.org/content/groups/public/</url>
+        </repository>
+    </repositories>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.papermc.paper</groupId>
+            <artifactId>paper-api</artifactId>
+            <version>1.21.4-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

src/main/java/org/dmitrium12/sunburn/Sunburn.java

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+package org.dmitrium12.sunburn;
+
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.scheduler.BukkitRunnable;
+
+import java.util.HashMap;
+import java.util.UUID;
+
+/**
+ * Sunburn plugin main class.
+ */
+public final class Sunburn extends JavaPlugin implements Listener {
+
+    private static final int DAYTIME_THRESHOLD = 12000; // Константа для порога дневного времени
+    private static final int BURN_COUNTDOWN_TIME = 5; // Константа для времени ожидания сгорания
+    String template = "Вы находитесь под солнцем! У вас есть %d секунд, чтобы спрятаться.";
+
+    private final HashMap<UUID, BukkitRunnable> activeTimers = new HashMap<>();
+
+    @Override
+    public void onEnable() {
+        getServer().getConsoleSender().sendMessage("Sunburn plugin enabled");
+        getServer().getPluginManager().registerEvents(this, this);
+    }
+
+    @Override
+    public void onDisable() {
+        synchronized (activeTimers) {
+            activeTimers.values().forEach(BukkitRunnable::cancel);
+            activeTimers.clear();
+        }
+        getServer().getConsoleSender().sendMessage("Sunburn plugin disabled");
+    }
+
+    @EventHandler
+    public void onPlayerMove(PlayerMoveEvent event) {
+        Player player = event.getPlayer();
+
+        UUID playerId = player.getUniqueId();
+
+        if (isPlayerExposedToSunlight(player)) {
+            if (!activeTimers.containsKey(playerId)) {
+                startBurnCountdown(player);
+            }
+        } else {
+            stopBurnCountdown(playerId);
+        }
+    }
+
+    /**
+     * Проверяет, находится ли игрок под солнцем.
+     *
+     * @param player игрок
+     * @return true, если игрок под солнцем, false иначе
+     */
+    private boolean isPlayerExposedToSunlight(Player player) {
+        boolean isDaytime = player.getWorld().getTime() % 24000 < DAYTIME_THRESHOLD;
+        boolean isClearSky = isClearSky(player);
+
+        return isDaytime && isClearSky;
+    }
+
+    /**
+     * Проверяет, есть ли над игроком открытая небесная область.
+     *
+     * @param player игрок
+     * @return true, если над игроком открытая небесная область, false иначе
+     */
+    private boolean isClearSky(Player player) {
+        for (int y = player.getLocation().getBlockY(); y < player.getWorld().getMaxHeight(); y++) {
+            Block currentBlock = player.getWorld().getBlockAt(
+                    player.getLocation().getBlockX(),
+                    y,
+                    player.getLocation().getBlockZ()
+            );
+            if (
+                    !currentBlock.getType().equals(Material.AIR) &&
+                    !currentBlock.getType().toString().contains("LEAF")
+            ) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Начинает отсчет времени сгорания для игрока.
+     *
+     * @param player игрок
+     */
+    private void startBurnCountdown(Player player) {
+        UUID playerId = player.getUniqueId();
+        BukkitRunnable task = new BurnCountdownTask(player, BURN_COUNTDOWN_TIME);
+        activeTimers.put(playerId, task);
+        task.runTaskTimer(this, 0, 20);
+    }
+
+    /**
+     * Останавливает отсчет времени сгорания для игрока.
+     *
+     * @param playerId ID игрока
+     */
+    private void stopBurnCountdown(UUID playerId) {
+        synchronized (activeTimers) {
+            if (activeTimers.containsKey(playerId)) {
+                activeTimers.get(playerId).cancel();
+                activeTimers.remove(playerId);
+            }
+        }
+    }
+
+    /**
+     * Задача для отсчета времени сгорания.
+     */
+    private class BurnCountdownTask extends BukkitRunnable {
+
+        private final Player player;
+        private int timeLeft;
+
+        public BurnCountdownTask(Player player, int timeLeft) {
+            this.player = player;
+            this.timeLeft = timeLeft;
+        }
+
+        @Override
+        public void run() {
+            if (!isPlayerExposedToSunlight(player)) {
+                stopBurnCountdown(player.getUniqueId());
+                return;
+            }
+
+            if (timeLeft <= 0) {
+                player.setFireTicks(100);
+            } else {
+                String text = String.format(template, timeLeft);
+                player.sendMessage(text);
+                timeLeft--;
+            }
+        }
+    }
+}

src/main/resources/plugin.yml

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+name: Sunburn
+version: '1.0'
+main: org.dmitrium12.sunburn.Sunburn
+api-version: '1.21'
+authors: [ Dmitrium12 ]
+description: Поджигает игроков на солнце.