Initial commit. Plugin done. Might add a config later.

.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/

README.md

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+# SmeltableGunpowder
+
+Does exactly what you think.
+
+### Credit
+
+Credit for the idea goes to https://twitter.com/db_witch/status/1676609696315088896
+
+Screenshot, if twitter dies:
+
+ ![Twitter screenshot](twitter-screenshot.png "Twitter screenshot")

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>me.redepicness</groupId>
+    <artifactId>SmeltableGunpowder</artifactId>
+    <version>1.0.0</version>
+    <packaging>jar</packaging>
+
+    <name>SmeltableGunpowder</name>
+
+    <description>Makes gunpowder smeltable...</description>
+    <properties>
+        <java.version>17</java.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <url>https://github.com/RedEpicness/SmeltableGunpowder</url>
+
+    <repositories>
+        <repository>
+            <id>papermc-repo</id>
+            <url>https://repo.papermc.io/repository/maven-public/</url>
+        </repository>
+    </repositories>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.papermc.paper</groupId>
+            <artifactId>paper-api</artifactId>
+            <version>1.20.1-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</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>3.2.4</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <createDependencyReducedPom>false</createDependencyReducedPom>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+</project>

src/main/java/me/redepicness/smeltablegunpowder/FurnaceListener.java

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+package me.redepicness.smeltablegunpowder;
+
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.Furnace;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.FurnaceSmeltEvent;
+import org.bukkit.inventory.CookingRecipe;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+
+public class FurnaceListener implements Listener {
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onGunpowderSmelt(@NotNull FurnaceSmeltEvent event){
+        CookingRecipe<?> recipe = event.getRecipe();
+
+        if(recipe == null || !recipe.key().equals(SmeltableGunpowder.GUNPOWDER_RECIPE.key()))
+            return;
+
+        event.setCancelled(true);
+
+        Block block = event.getBlock();
+        Furnace state = (Furnace) event.getBlock().getState();
+        ItemStack smelting = state.getInventory().getSmelting();
+        float power = smelting != null ? smelting.getAmount() : 1f;
+
+        // So the explosion damages players and isn't trapped in the block
+        block.breakNaturally(new ItemStack(Material.NETHERITE_PICKAXE));
+        block.getLocation().toCenterLocation().createExplosion(power);
+    }
+
+}

src/main/java/me/redepicness/smeltablegunpowder/SmeltableGunpowder.java

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+package me.redepicness.smeltablegunpowder;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.inventory.FurnaceRecipe;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.NotNull;
+
+public final class SmeltableGunpowder extends JavaPlugin {
+
+    public static @NotNull FurnaceRecipe GUNPOWDER_RECIPE = new FurnaceRecipe(
+            new NamespacedKey("redepicness", "gunpowder"),
+            new ItemStack(Material.TNT),
+            Material.GUNPOWDER,
+            0,
+            40
+    );
+
+    @Override
+    public void onEnable() {
+        getSLF4JLogger().info("Adding gunpowder recipe...");
+        Bukkit.addRecipe(GUNPOWDER_RECIPE);
+        Bukkit.getPluginManager().registerEvents(new FurnaceListener(), this);
+    }
+
+}

src/main/resources/paper-plugin.yml

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+name: SmeltableGunpowder
+version: '${project.version}'
+main: me.redepicness.smeltablegunpowder.SmeltableGunpowder
+api-version: '1.20'
+authors: [Red_Epicness]
+description: Makes gunpowder smeltable...
+website: https://github.com/RedEpicness/SmeltableGunpowder