SPIGOT-892: Set chicken egg baby age before adding it to world.

nms-patches/EntityEgg.patch

@@ -13,7 +13,7 @@
  public class EntityEgg extends EntityProjectile {
  
      public EntityEgg(World world) {
-@@ -19,21 +26,36 @@
+@@ -19,21 +26,37 @@
              movingobjectposition.entity.damageEntity(DamageSource.projectile(this, this.getShooter()), 0.0F);
          }
  
@@ -53,10 +53,11 @@
 -            }
 +        if (hatching) {
 +            for (int k = 0; k < numHatching; k++) {
-+                org.bukkit.entity.Entity entity = world.getWorld().spawn(new org.bukkit.Location(world.getWorld(), this.locX, this.locY, this.locZ, this.yaw, 0.0F), hatchingType.getEntityClass(), org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.EGG);
-+                if (entity instanceof Ageable) {
-+                    ((Ageable) entity).setBaby();
++                Entity entity = world.getWorld().createEntity(new org.bukkit.Location(world.getWorld(), this.locX, this.locY, this.locZ, this.yaw, 0.0F), hatchingType.getEntityClass());
++                if (entity.getBukkitEntity() instanceof Ageable) {
++                    ((Ageable) entity.getBukkitEntity()).setBaby();
 +                }
++                world.getWorld().addEntity(entity, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.EGG);
 +             }
          }
 +        // CraftBukkit end

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -1,5 +1,6 @@
 package org.bukkit.craftbukkit;
 
+import com.google.common.base.Preconditions;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -882,7 +883,7 @@ public class CraftWorld implements World {
     }
 
     @SuppressWarnings("unchecked")
-    public <T extends Entity> T spawn(Location location, Class<T> clazz, SpawnReason reason) throws IllegalArgumentException {
+    public net.minecraft.server.Entity createEntity(Location location, Class<? extends Entity> clazz) throws IllegalArgumentException {
         if (location == null || clazz == null) {
             throw new IllegalArgumentException("Location or entity class cannot be null");
         }
@@ -1108,6 +1109,16 @@ public class CraftWorld implements World {
         }
 
         if (entity != null) {
+            return entity;
+        }
+
+        throw new IllegalArgumentException("Cannot spawn an entity for " + clazz.getName());
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Entity> T addEntity(net.minecraft.server.Entity entity, SpawnReason reason) throws IllegalArgumentException {
+        Preconditions.checkArgument(entity != null, "Cannot spawn null entity");
+
         if (entity instanceof EntityInsentient) {
             ((EntityInsentient) entity).prepare(getHandle().E(new BlockPosition(entity)), (GroupDataEntity) null);
         }
@@ -1116,7 +1127,10 @@ public class CraftWorld implements World {
         return (T) entity.getBukkitEntity();
     }
 
-        throw new IllegalArgumentException("Cannot spawn an entity for " + clazz.getName());
+    public <T extends Entity> T spawn(Location location, Class<T> clazz, SpawnReason reason) throws IllegalArgumentException {
+        net.minecraft.server.Entity entity = createEntity(location, clazz);
+
+        return addEntity(entity, reason);
     }
 
     public ChunkSnapshot getEmptyChunkSnapshot(int x, int z, boolean includeBiome, boolean includeBiomeTempRain) {