Use Paper method to get server protocol version if possible

build.gradle.kts

@@ -47,11 +47,11 @@ subprojects {
     }
 
     repositories {
+        maven("https://repo.viaversion.com")
+        maven("https://papermc.io/repo/repository/maven-public/")
         maven("https://oss.sonatype.org/content/repositories/snapshots/")
-        maven("https://hub.spigotmc.org/nexus/content/repositories/snapshots")
         maven("https://nexus.velocitypowered.com/repository/velocity-artifacts-snapshots/")
         maven("https://repo.spongepowered.org/repository/maven-public/")
-        maven("https://repo.viaversion.com")
         maven("https://libraries.minecraft.net")
         maven("https://repo.maven.apache.org/maven2/")
     }

buildSrc/src/main/kotlin/Versions.kt

@@ -15,7 +15,7 @@ object Versions {
     const val checkerQual = "3.12.0"
 
     // Platforms
-    const val spigot = "1.16.5-R0.1-SNAPSHOT"
+    const val paper = "1.16.5-R0.1-SNAPSHOT"
     const val legacyBukkit = "1.8.8-R0.1-SNAPSHOT"
     const val bungee = "1.16-R0.5-SNAPSHOT"
     const val sponge = "5.0.0"

bukkit/build.gradle.kts

@@ -2,7 +2,7 @@ dependencies {
     implementation(project(":viaversion-bukkit-legacy"))
     implementation(project(":viaversion-common"))
     implementation("org.javassist", "javassist", Versions.javassist)
-    compileOnly("org.spigotmc", "spigot-api", Versions.spigot) {
+    compileOnly("com.destroystokyo.paper", "paper-api", Versions.paper) {
         exclude("junit", "junit")
         exclude("com.google.code.gson", "gson")
         exclude("javax.persistence", "persistence-api")

bukkit/src/main/java/us/myles/ViaVersion/bukkit/platform/BukkitViaInjector.java

@@ -23,6 +23,8 @@ import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.socket.SocketChannel;
+import org.bukkit.Bukkit;
+import org.bukkit.UnsafeValues;
 import org.bukkit.plugin.PluginDescriptionFile;
 import us.myles.ViaVersion.api.Pair;
 import us.myles.ViaVersion.api.Via;
@@ -39,10 +41,12 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
+//TODO screams
 public class BukkitViaInjector implements ViaInjector {
     private final List<ChannelFuture> injectedFutures = new ArrayList<>();
     private final List<Pair<Field, Object>> injectedLists = new ArrayList<>();
 
+    private final boolean modernPaper = hasServerProtocolMethod();
     private boolean protocolLib;
 
     @Override
@@ -186,6 +190,11 @@ public class BukkitViaInjector implements ViaInjector {
 
     @Override
     public int getServerProtocolVersion() throws Exception {
+        if (modernPaper) {
+            // *Trust me, it's safe*
+            return Bukkit.getUnsafe().getProtocolVersion();
+        }
+
         try {
             Class<?> serverClazz = NMSUtil.nms("MinecraftServer");
             Object server = ReflectionUtil.invokeStatic(serverClazz, "getServer");
@@ -367,4 +376,17 @@ public class BukkitViaInjector implements ViaInjector {
     public void setProtocolLib(boolean protocolLib) {
         this.protocolLib = protocolLib;
     }
+
+    public boolean isModernPaper() {
+        return modernPaper;
+    }
+
+    private static boolean hasServerProtocolMethod() {
+        try {
+            Class.forName("org.bukkit.UnsafeValues").getDeclaredMethod("getProtocolVersion");
+            return true;
+        } catch (ReflectiveOperationException e) {
+            return false;
+        }
+    }
 }

bungee/src/main/java/us/myles/ViaVersion/bungee/platform/BungeeViaInjector.java

@@ -42,6 +42,7 @@ public class BungeeViaInjector implements ViaInjector {
             field.setAccessible(true);
 
             // Remove the final modifier (unless removed by a fork)
+            //TODO Fix Java 16 compatibility
             int modifiers = field.getModifiers();
             if (Modifier.isFinal(modifiers)) {
                 try {

sponge/src/main/java/us/myles/ViaVersion/sponge/platform/SpongeViaInjector.java

@@ -37,6 +37,7 @@ import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.List;
 
+//TODO screams
 public class SpongeViaInjector implements ViaInjector {
     private List<ChannelFuture> injectedFutures = new ArrayList<>();
     private List<Pair<Field, Object>> injectedLists = new ArrayList<>();