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Corrected issues with worldGenContext not correctly being set (Ref: https://stackoverflow.com/questions/56039341/get-declared-fields-of-java-lang-reflect-fields-in-jdk12/56043252#56043252)

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This commit is contained in:
Oak
2024-06-23 14:16:50 +01:00
parent fddc9a52b9
commit e7cc275340
2 changed files with 33 additions and 14 deletions
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21
common/api/src/main/java/com/dfsek/terra/api/util/reflection/ReflectionUtil.java
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@@ -8,6 +8,7 @@
package com.dfsek.terra.api.util.reflection;
import org.jetbrains.annotations.NotNull;
import sun.misc.Unsafe;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
@@ -26,6 +27,18 @@ import java.util.stream.Stream;
public final class ReflectionUtil {
private static final Unsafe UNSAFE;
static {
try{
final Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
unsafeField.setAccessible(true);
UNSAFE = (Unsafe) unsafeField.get(null);
} catch(NoSuchFieldException | IllegalAccessException e){
throw new RuntimeException(e);
}
}
public static Field[] getFields(@NotNull Class<?> type) {
Field[] result = type.getDeclaredFields();
Class<?> parentClass = type.getSuperclass();
@@ -35,6 +48,14 @@ public final class ReflectionUtil {
return result;
}
public static void setFinalField(Object obj, String fieldName, Object value) throws NoSuchFieldException {
Field field = obj.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
long fieldOffset = UNSAFE.objectFieldOffset(field);
UNSAFE.putObject(obj, fieldOffset, value);
}
public static Method[] getMethods(@NotNull Class<?> type) {
Method[] result = type.getDeclaredMethods();
Class<?> parentClass = type.getSuperclass();

26
platforms/bukkit/nms/v1_21/src/main/java/com/dfsek/terra/bukkit/nms/v1_21/NMSInjectListener.java
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@@ -1,9 +1,12 @@
package com.dfsek.terra.bukkit.nms.v1_21;
import com.dfsek.terra.api.util.reflection.ReflectionUtil;
import net.minecraft.server.level.ChunkMap;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.level.chunk.ChunkGenerator;
import net.minecraft.world.level.chunk.status.WorldGenContext;
import org.bukkit.Bukkit;
import org.bukkit.World;
import org.bukkit.craftbukkit.CraftWorld;
import org.bukkit.event.EventHandler;
@@ -12,7 +15,6 @@ import org.bukkit.event.world.WorldInitEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.locks.ReentrantLock;
@@ -41,21 +43,17 @@ public class NMSInjectListener implements Listener {
ChunkGenerator vanilla = serverWorld.getChunkSource().getGenerator();
NMSBiomeProvider provider = new NMSBiomeProvider(pack.getBiomeProvider(), craftWorld.getSeed());
ChunkMap chunkMap = serverWorld.getChunkSource().chunkMap;
WorldGenContext worldGenContext = chunkMap.worldGenContext;
try {
Field worldGenContextField = chunkMap.getClass().getDeclaredField("worldGenContext");
worldGenContextField.setAccessible(true);
WorldGenContext worldGenContext = (WorldGenContext) worldGenContextField.get(chunkMap);
worldGenContextField.set(chunkMap,
new WorldGenContext(
worldGenContext.level(),
new NMSChunkGeneratorDelegate(vanilla, pack, provider, craftWorld.getSeed()),
worldGenContext.structureManager(),
worldGenContext.lightEngine(),
worldGenContext.mainThreadMailBox()
));
} catch(NoSuchFieldException | IllegalAccessException e) {
ReflectionUtil.setFinalField(chunkMap, "worldGenContext", new WorldGenContext(
worldGenContext.level(),
new NMSChunkGeneratorDelegate(vanilla, pack, provider, craftWorld.getSeed()),
worldGenContext.structureManager(),
worldGenContext.lightEngine(),
worldGenContext.mainThreadMailBox()
));
} catch(NoSuchFieldException e) {
throw new RuntimeException(e);
}