Initial release

.gitignore

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+target/
+bin/
+.idea/
+**.iml
+.project
+.classpath

README.MD

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+### About
+AnvilUnlocker is a Bukkit plugin allowing anvils to be used past the normal level cap of 40. No permissions, no setup.
+
+As this provides a definite gameplay advantage, I will not be modifying this plugin to add permissions.
+
+### Caveats
+* Due to client limitations, repair costs over 40 levels cannot be displayed in red whether or not the client has the experience required to complete the repair. For simplicity and consistency, AnvilUnlocker uses an approach that sends a minimum number of packets but entirely removes the mechanic of the cost turning red when the client lacks the required experience, even when the cost is under 40 levels.
+* Due to the client's inability to display items' costs greater than a short's max value (32767) and subsequent wrapping around, the new maximum is capped to 32767 instead of allowing any valid int value.

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>com.github.jikoo</groupId>
+    <artifactId>anvilunlocker</artifactId>
+    <name>AnvilUnlocker</name>
+    <version>1.0.0</version>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <repositories>
+        <repository>
+            <id>spigot-repo</id>
+            <url>https://hub.spigotmc.org/nexus/content/groups/public/</url>
+        </repository>
+        <repository>
+            <id>dmulloy2-repo</id>
+            <url>http://repo.dmulloy2.net/nexus/repository/public/</url>
+        </repository>
+    </repositories>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot-api</artifactId>
+            <version>1.15.2-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.comphenix.protocol</groupId>
+            <artifactId>ProtocolLib</artifactId>
+            <version>4.5.0</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>${project.name}</finalName>
+
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/com/github/jikoo/anvilunlocker/AnvilUnlocker.java

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+package com.github.jikoo.anvilunlocker;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.PacketContainer;
+import java.lang.reflect.InvocationTargetException;
+import org.bukkit.GameMode;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.InventoryCloseEvent;
+import org.bukkit.event.inventory.InventoryOpenEvent;
+import org.bukkit.inventory.AnvilInventory;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class AnvilUnlocker extends JavaPlugin implements Listener {
+
+	@Override
+	public void onEnable() {
+		getServer().getPluginManager().registerEvents(this, this);
+	}
+
+	@EventHandler
+	public void onInventoryOpen(InventoryOpenEvent event) {
+		if (event.getInventory() instanceof AnvilInventory && event.getPlayer() instanceof Player
+				&& event.getPlayer().getGameMode() != GameMode.CREATIVE) {
+			((AnvilInventory) event.getInventory()).setMaximumRepairCost(Short.MAX_VALUE);
+			setInstantBuild((Player) event.getPlayer(), true);
+		}
+	}
+
+	@EventHandler
+	public void onInventoryClose(InventoryCloseEvent event) {
+		if (event.getInventory() instanceof AnvilInventory && event.getPlayer() instanceof Player
+				&& event.getPlayer().getGameMode() != GameMode.CREATIVE) {
+			setInstantBuild((Player) event.getPlayer(), false);
+		}
+	}
+
+	public void setInstantBuild(Player player, boolean instantBuild) {
+		PacketContainer packet = new PacketContainer(PacketType.Play.Server.ABILITIES);
+		packet.getBooleans().write(0, player.isInvulnerable());
+		packet.getBooleans().write(1, player.isFlying());
+		packet.getBooleans().write(2, player.getAllowFlight());
+		packet.getBooleans().write(3, instantBuild);
+		packet.getFloat().write(0, player.getFlySpeed() / 2);
+		packet.getFloat().write(1, player.getWalkSpeed() / 2);
+
+		try {
+			ProtocolLibrary.getProtocolManager().sendServerPacket(player, packet);
+		} catch (InvocationTargetException e) {
+			e.printStackTrace();
+		}
+	}
+
+}

src/main/resources/plugin.yml

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+name: ${project.name}
+main: ${project.groupId}.${project.artifactId}.${project.name}
+version: ${project.version}
+api-version: "1.15"
+author: Jikoo
+softdepend: ["ProtocolLib"]