craftbukkit/nms-patches/net/minecraft/world/level/dimension/end/EnderDragonBattle.patch

--- a/net/minecraft/world/level/dimension/end/EnderDragonBattle.java
+++ b/net/minecraft/world/level/dimension/end/EnderDragonBattle.java
@@ -111,14 +111,14 @@
         this.origin = blockposition;
         this.validPlayer = IEntitySelector.ENTITY_STILL_ALIVE.and(IEntitySelector.withinDistance((double) blockposition.getX(), (double) (128 + blockposition.getY()), (double) blockposition.getZ(), 192.0D));
         this.needsStateScanning = enderdragonbattle_a.needsStateScanning;
-        this.dragonUUID = (UUID) enderdragonbattle_a.dragonUUID.orElse((Object) null);
+        this.dragonUUID = (UUID) enderdragonbattle_a.dragonUUID.orElse(null); // CraftBukkit - decompile error
         this.dragonKilled = enderdragonbattle_a.dragonKilled;
         this.previouslyKilled = enderdragonbattle_a.previouslyKilled;
         if (enderdragonbattle_a.isRespawning) {
             this.respawnStage = EnumDragonRespawn.START;
         }
 
-        this.portalLocation = (BlockPosition) enderdragonbattle_a.exitPortalLocation.orElse((Object) null);
+        this.portalLocation = (BlockPosition) enderdragonbattle_a.exitPortalLocation.orElse(null); // CraftBukkit - decompile error
         this.gateways.addAll((Collection) enderdragonbattle_a.gateways.orElseGet(() -> {
             ObjectArrayList<Integer> objectarraylist = new ObjectArrayList(ContiguousSet.create(Range.closedOpen(0, 20), DiscreteDomain.integers()));
 
@@ -208,7 +208,7 @@
             this.dragonKilled = false;
             if (!flag) {
                 EnderDragonBattle.LOGGER.info("But we didn't have a portal, let's remove it.");
-                entityenderdragon.discard();
+                entityenderdragon.discard(null); // CraftBukkit - add Bukkit remove cause
                 this.dragonUUID = null;
             }
         }
@@ -513,7 +513,7 @@
         return this.previouslyKilled;
     }
 
-    public void tryRespawn() {
+    public boolean tryRespawn() { // CraftBukkit - return boolean
         if (this.dragonKilled && this.respawnStage == null) {
             BlockPosition blockposition = this.portalLocation;
 
@@ -540,19 +540,19 @@
                 List<EntityEnderCrystal> list1 = this.level.getEntitiesOfClass(EntityEnderCrystal.class, new AxisAlignedBB(blockposition1.relative(enumdirection, 2)));
 
                 if (list1.isEmpty()) {
-                    return;
+                    return false; // CraftBukkit - return value
                 }
 
                 list.addAll(list1);
             }
 
             EnderDragonBattle.LOGGER.debug("Found all crystals, respawning dragon.");
-            this.respawnDragon(list);
+            return this.respawnDragon(list); // CraftBukkit - return value
         }
-
+        return false; // CraftBukkit - return value
     }
 
-    public void respawnDragon(List<EntityEnderCrystal> list) {
+    public boolean respawnDragon(List<EntityEnderCrystal> list) { // CraftBukkit - return boolean
         if (this.dragonKilled && this.respawnStage == null) {
             for (ShapeDetector.ShapeDetectorCollection shapedetector_shapedetectorcollection = this.findExitPortal(); shapedetector_shapedetectorcollection != null; shapedetector_shapedetectorcollection = this.findExitPortal()) {
                 for (int i = 0; i < this.exitPortalPattern.getWidth(); ++i) {
@@ -572,8 +572,9 @@
             this.respawnTime = 0;
             this.spawnExitPortal(false);
             this.respawnCrystals = list;
+            return true; // CraftBukkit - return value
         }
-
+        return false; // CraftBukkit - return value
     }
 
     public void resetSpikeCrystals() {