fix: memory leak

Author: CoolLoong

src/main/java/cn/nukkit/blockstate/BlockStateRegistry.java

@@ -280,12 +280,12 @@ public Registration getRegistration(BlockState state) {
     static Map<String, String> extraMappings = new HashMap<>();
 
     static {
-        extraMappings.put("17:4", "minecraft:acacia;pillar_axis=y");
-        extraMappings.put("17:12", "minecraft:acacia;pillar_axis=x");
-        extraMappings.put("17:20", "minecraft:acacia;pillar_axis=z");
-        extraMappings.put("17:5", "minecraft:dark_oak;pillar_axis=y");
-        extraMappings.put("17:13", "minecraft:dark_oak;pillar_axis=x");
-        extraMappings.put("17:21", "minecraft:dark_oak;pillar_axis=z");
+        extraMappings.put("17:4", "minecraft:acacia_log;pillar_axis=y");
+        extraMappings.put("17:12", "minecraft:acacia_log;pillar_axis=x");
+        extraMappings.put("17:20", "minecraft:acacia_log;pillar_axis=z");
+        extraMappings.put("17:5", "minecraft:dark_oak_log;pillar_axis=y");
+        extraMappings.put("17:13", "minecraft:dark_oak_log;pillar_axis=x");
+        extraMappings.put("17:21", "minecraft:dark_oak_log;pillar_axis=z");
     }
 
     private Registration findRegistration(final BlockState state) {

src/main/java/cn/nukkit/convert/task/ConvertTask.java

@@ -41,8 +41,11 @@ protected boolean exec() {
                     if (regionLoader.chunkExists(i, j)) {
                         try {
                             Chunk chunk = (Chunk) regionLoader.readChunk(i, j);
-                            chunk.initChunk();
-                            levelDBStorage.writeChunk(chunk, dimensionData);
+                            if (chunk != null) {
+                                chunk.initChunk();
+                                levelDBStorage.writeChunk(chunk, dimensionData);
+                            }
+                            chunk = null;
                         } catch (IOException e) {
                             throw new RuntimeException(e);
                         }
@@ -51,6 +54,11 @@ protected boolean exec() {
                 }
             }
         } // progress bar stops automatically after completion of try-with-resource block
+        try {
+            regionLoader.close();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
         return true;
     }
 }

src/main/java/cn/nukkit/item/RuntimeItemMapping.java

@@ -302,7 +302,8 @@ public int getNetworkId(Item item) {
             runtimeEntry = legacy2Runtime.get(RuntimeItems.getFullId(item.getId(), 0));
         }
         if (runtimeEntry == null) {
-            throw new IllegalArgumentException("Unknown item mapping " + item);
+            log.warn("Unknown item mapping " + item);
+            return item.getId();
         }
         return runtimeEntry.runtimeId;
     }