Update to 1.17.1

Fixes #1315

pom.xml

@@ -17,7 +17,7 @@
 		<project.fullVersion>${project.version}</project.fullVersion>
 
 		<powermock.version>2.0.7</powermock.version>
-		<spigot.version>1.17-R0.1-SNAPSHOT</spigot.version>
+		<spigot.version>1.17.1-R0.1-SNAPSHOT</spigot.version>
 	</properties>
 
 	<build>

src/main/java/com/comphenix/protocol/PacketType.java

@@ -11,6 +11,7 @@ import java.util.function.Consumer;
 import com.comphenix.protocol.PacketTypeLookup.ClassLookup;
 import com.comphenix.protocol.events.ConnectionSide;
 import com.comphenix.protocol.injector.packet.PacketRegistry;
+import com.comphenix.protocol.utility.Constants;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.utility.MinecraftVersion;
 import com.google.common.base.Preconditions;
@@ -653,7 +654,7 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
 	/**
 	 * Protocol version of all the current IDs.
 	 */
-	private static final MinecraftVersion PROTOCOL_VERSION = MinecraftVersion.CAVES_CLIFFS_1;
+	private static final MinecraftVersion PROTOCOL_VERSION = Constants.CURRENT_VERSION;
 
 	private final Protocol protocol;
 	private final Sender sender;

src/main/java/com/comphenix/protocol/ProtocolLibrary.java

@@ -38,12 +38,12 @@ public class ProtocolLibrary {
 	/**
 	 * The maximum version ProtocolLib has been tested with.
 	 */
-	public static final String MAXIMUM_MINECRAFT_VERSION = "1.17";
+	public static final String MAXIMUM_MINECRAFT_VERSION = "1.17.1";
 
 	/**
-	 * The date (with ISO 8601 or YYYY-MM-DD) when the most recent version (1.17) was released.
+	 * The date (with ISO 8601 or YYYY-MM-DD) when the most recent version (1.17.1) was released.
 	 */
-	public static final String MINECRAFT_LAST_RELEASE_DATE = "2021-06-08";
+	public static final String MINECRAFT_LAST_RELEASE_DATE = "2021-07-06";
 
 	/**
 	 * Plugins that are currently incompatible with ProtocolLib.

src/main/java/com/comphenix/protocol/events/AbstractStructure.java

@@ -914,6 +914,16 @@ public abstract class AbstractStructure {
         );
     }
 
+    public StructureModifier<List<Integer>> getIntLists() {
+        return structureModifier.withType(
+                List.class,
+                BukkitConverters.getListConverter(
+                        MinecraftReflection.getIntArrayListClass(),
+                        Converters.passthrough(int.class)
+                )
+        );
+    }
+
     /**
      * Retrieve a read/write structure for the Map class.
      * @param keyConverter Converter for map keys

src/main/java/com/comphenix/protocol/utility/MinecraftProtocolVersion.java

@@ -75,6 +75,7 @@ public class MinecraftProtocolVersion {
 		map.put(new MinecraftVersion(1, 16, 5), 754);
 
 		map.put(new MinecraftVersion(1, 17, 0), 755);
+		map.put(new MinecraftVersion(1, 17, 1), 756);
 		return map;
 	}
 

src/main/java/com/comphenix/protocol/utility/MinecraftReflection.java

@@ -2250,17 +2250,21 @@ public class MinecraftReflection {
 		return getMinecraftClass("world.entity.ai.attributes.AttributeBase", "AttributeBase");
 	}
 
-	public static Class<?> getInt2ObjectMapClass() {
+	public static Class<?> getFastUtilClass(String className) {
 		try {
-			return getMinecraftLibraryClass("it.unimi.dsi.fastutil.ints.Int2ObjectMap");
+			return getMinecraftLibraryClass("it.unimi.dsi.fastutil." + className);
 		} catch (RuntimeException ex) {
-			try {
-				Class<?> clazz = getMinecraftLibraryClass("org.bukkit.craftbukkit.libs.it.unimi.dsi.fastutil.ints.Int2ObjectMap");
-				setMinecraftLibraryClass("it.unimi.dsi.fastutil.ints.Int2ObjectMap", clazz);
-				return clazz;
-			} catch (RuntimeException ignored) {
-				throw ex;
-			}
+			Class<?> clazz = getMinecraftLibraryClass("org.bukkit.craftbukkit.libs.it.unimi.dsi.fastutil." + className);
+			setMinecraftLibraryClass("it.unimi.dsi.fastutil." + className, clazz);
+			return clazz;
 		}
 	}
+
+	public static Class<?> getInt2ObjectMapClass() {
+		return getFastUtilClass("ints.Int2ObjectMap");
+	}
+
+	public static Class<?> getIntArrayListClass() {
+		return getFastUtilClass("ints.IntArrayList");
+	}
 }

src/main/java/com/comphenix/protocol/wrappers/BukkitConverters.java

@@ -267,7 +267,86 @@ public class BukkitConverters {
 		};
 	}
 
-	private static Map<Class<?>, Supplier<List<Object>>> LIST_SUPPLIERS = new ConcurrentHashMap<>();
+	private static final Map<Class<?>, Supplier<List<Object>>> LIST_SUPPLIERS = new ConcurrentHashMap<>();
+
+	private static <T> Object getGenericList(Class<?> listClass, List<T> specific, EquivalentConverter<T> itemConverter) {
+		List<Object> newList;
+		Supplier<List<Object>> supplier = LIST_SUPPLIERS.get(listClass);
+		if (supplier == null) {
+			try {
+				Constructor<?> ctor = listClass.getConstructor();
+				newList = (List<Object>) ctor.newInstance();
+				supplier = () -> {
+					try {
+						return (List<Object>) ctor.newInstance();
+					} catch (ReflectiveOperationException ex) {
+						throw new RuntimeException(ex);
+					}
+				};
+			} catch (ReflectiveOperationException ex) {
+				ex.printStackTrace();
+				supplier = ArrayList::new;
+				newList = new ArrayList<>();
+			}
+
+			LIST_SUPPLIERS.put(listClass, supplier);
+		} else {
+			newList = supplier.get();
+		}
+
+		// Convert each object
+		for (T position : specific) {
+			if (position != null) {
+				Object converted = itemConverter.getGeneric(position);
+				if (converted != null) {
+					newList.add(converted);
+				}
+			} else {
+				newList.add(null);
+			}
+		}
+
+		return newList;
+	}
+
+	private static <T> List<T> getSpecificList(Object generic, EquivalentConverter<T> itemConverter) {
+		if (generic instanceof Collection) {
+			List<T> items = new ArrayList<>();
+
+			// Copy everything to a new list
+			for (Object item : (Collection<Object>) generic) {
+				T result = itemConverter.getSpecific(item);
+
+				if (item != null)
+					items.add(result);
+			}
+			return items;
+		}
+
+		// Not valid
+		return null;
+	}
+
+	public static <T> EquivalentConverter<List<T>> getListConverter(final Class<?> listClass, final EquivalentConverter<T> itemConverter) {
+		return ignoreNull(new EquivalentConverter<List<T>>() {
+			@Override
+			public List<T> getSpecific(Object generic) {
+				return getSpecificList(generic, itemConverter);
+			}
+
+			@Override
+			public Object getGeneric(List<T> specific) {
+				return getGenericList(listClass, specific, itemConverter);
+			}
+
+			@Override
+			public Class<List<T>> getSpecificType() {
+				// Damn you Java
+				Class<?> dummy = List.class;
+				return (Class<List<T>>) dummy;
+			}
+		});
+	}
 
 	/**
 	 * Retrieve an equivalent converter for a list of generic items.
@@ -280,61 +359,12 @@ public class BukkitConverters {
 		return ignoreNull(new EquivalentConverter<List<T>>() {
 			@Override
 			public List<T> getSpecific(Object generic) {
-				if (generic instanceof Collection) {
-					List<T> items = new ArrayList<>();
-
-					// Copy everything to a new list
-					for (Object item : (Collection<Object>) generic) {
-						T result = itemConverter.getSpecific(item);
-
-						if (item != null)
-							items.add(result);
-					}
-					return items;
-				}
-
-				// Not valid
-				return null;
+				return getSpecificList(generic, itemConverter);
 			}
 
 			@Override
 			public Object getGeneric(List<T> specific) {
-				List<Object> newList;
-				Supplier<List<Object>> supplier = LIST_SUPPLIERS.get(specific.getClass());
-				if (supplier == null) {
-					try {
-						Constructor<?> ctor = specific.getClass().getConstructor();
-						newList = (List<Object>) ctor.newInstance();
-						supplier = () -> {
-							try {
-								return (List<Object>) ctor.newInstance();
-							} catch (ReflectiveOperationException ex) {
-								throw new RuntimeException(ex);
-							}
-						};
-					} catch (ReflectiveOperationException ex) {
-						supplier = ArrayList::new;
-						newList = new ArrayList<>();
-					}
-					
-					LIST_SUPPLIERS.put(specific.getClass(), supplier);
-				} else {
-					newList = supplier.get();
-				}
-
-				// Convert each object
-				for (T position : specific) {
-					if (position != null) {
-						Object converted = itemConverter.getGeneric(position);
-						if (converted != null) {
-							newList.add(converted);
-						}
-					} else {
-						newList.add(null);
-					}
-				}
-
-				return newList;
+				return getGenericList(specific.getClass(), specific, itemConverter);
 			}
 
 			@Override

src/test/java/com/comphenix/protocol/events/PacketContainerTest.java

@@ -385,6 +385,19 @@ public class PacketContainerTest {
 		assertEquals("Test", copy.getStrings().read(0));
 	}
 
+	@Test
+	public void testIntList() {
+		PacketContainer destroy = new PacketContainer(PacketType.Play.Server.ENTITY_DESTROY);
+		destroy.getIntLists().write(0, new ArrayList<Integer>() {{
+			add(420);
+			add(69);
+		}});
+		List<Integer> back = destroy.getIntLists().read(0);
+		assertEquals(back.size(), 2);
+		assertEquals((int) back.get(0), 420);
+		assertEquals((int) back.get(1), 69);
+	}
+
 	@Test
 	public void testAttributeList() {
 		PacketContainer attribute = new PacketContainer(PacketType.Play.Server.UPDATE_ATTRIBUTES);

src/test/java/com/comphenix/protocol/reflect/cloning/AggregateClonerTest.java

@@ -3,6 +3,7 @@ package com.comphenix.protocol.reflect.cloning;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 
+import java.lang.reflect.Field;
 import java.util.Arrays;
 import java.util.List;
 
@@ -20,7 +21,7 @@ public class AggregateClonerTest {
 
 	@BeforeClass
 	public static void initializeBukkit() {
-		BukkitInitialization.initializePackage();
+		BukkitInitialization.initializeItemMeta();
 	}
 	
 	@Test
@@ -29,7 +30,8 @@ public class AggregateClonerTest {
 		assertEquals(input, AggregateCloner.DEFAULT.clone(input));
 	}
 
-	@Test
+	// @Test
+	// Usages of NonNullList were removed in 1.17.1
 	public void testNonNullList() {
 		PacketContainer packet = new PacketContainer(PacketType.Play.Server.WINDOW_ITEMS);