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A Minecraft Bedrock Edition server software implementation made in Java from scratch which supports all new features.
There is a newer version: 1.6.0.1-PN
package cn.nukkit.item;

import cn.nukkit.Server;
import cn.nukkit.api.PowerNukkitOnly;
import cn.nukkit.api.Since;
import cn.nukkit.utils.BinaryStream;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import it.unimi.dsi.fastutil.ints.Int2IntMap;
import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;
import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
import lombok.RequiredArgsConstructor;
import lombok.ToString;
import lombok.experimental.UtilityClass;
import lombok.extern.log4j.Log4j2;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

import static com.google.common.base.Verify.verify;

@Since("1.4.0.0-PN")
@UtilityClass
@Log4j2
public class RuntimeItems {

    private static final Gson GSON = new Gson();
    private static final Type ENTRY_TYPE = new TypeToken>(){}.getType();

    private static final RuntimeItemMapping itemPalette;

    static {
        log.debug("Loading runtime items...");
        InputStream stream = Server.class.getClassLoader().getResourceAsStream("runtime_item_ids.json");
        if (stream == null) {
            throw new AssertionError("Unable to load runtime_item_ids.json");
        }

        InputStreamReader reader = new InputStreamReader(stream, StandardCharsets.UTF_8);
        Collection entries = GSON.fromJson(reader, ENTRY_TYPE);

        BinaryStream paletteBuffer = new BinaryStream();
        paletteBuffer.putUnsignedVarInt(entries.size());

        Int2IntMap legacyNetworkMap = new Int2IntOpenHashMap();
        Int2IntMap networkLegacyMap = new Int2IntOpenHashMap();
        Map namespaceNetworkMap = new LinkedHashMap<>();
        Int2ObjectMap networkNamespaceMap = new Int2ObjectOpenHashMap<>();
        for (Entry entry : entries) {
            paletteBuffer.putString(entry.name);
            paletteBuffer.putLShort(entry.id);
            paletteBuffer.putBoolean(false); // Component item
            namespaceNetworkMap.put(entry.name, entry.id);
            networkNamespaceMap.put(entry.id, entry.name);
            if (entry.oldId != null) {
                boolean hasData = entry.oldData != null;
                int fullId = getFullId(entry.oldId, hasData ? entry.oldData : 0);
                if (entry.deprecated != Boolean.TRUE) {
                    verify(legacyNetworkMap.put(fullId, (entry.id << 1) | (hasData ? 1 : 0)) == 0,
                            "Conflict while registering an item runtime id!"
                    );
                }
                verify(networkLegacyMap.put(entry.id, fullId | (hasData ? 1 : 0)) == 0,
                        "Conflict while registering an item runtime id!"
                );
            }
        }

        byte[] itemDataPalette = paletteBuffer.getBuffer();
        itemPalette = new RuntimeItemMapping(itemDataPalette, legacyNetworkMap, networkLegacyMap, 
                namespaceNetworkMap, networkNamespaceMap);
    }

    @Since("1.4.0.0-PN")
    public static RuntimeItemMapping getRuntimeMapping() {
        return itemPalette;
    }

    @Since("1.4.0.0-PN")
    public static int getId(int fullId) {
        return (short) (fullId >> 16);
    }

    @Since("1.4.0.0-PN")
    public static int getData(int fullId) {
        return ((fullId >> 1) & 0x7fff);
    }

    @Since("1.4.0.0-PN")
    public static int getFullId(int id, int data) {
        return (((short) id) << 16) | ((data & 0x7fff) << 1);
    }

    @Since("1.4.0.0-PN")
    public static int getNetworkId(int networkFullId) {
        return networkFullId >> 1;
    }

    @Since("1.4.0.0-PN")
    public static boolean hasData(int id) {
        return (id & 0x1) != 0;
    }

    @ToString
    @RequiredArgsConstructor
    static class Entry {
        String name;
        int id;
        Integer oldId;
        Integer oldData;
        @PowerNukkitOnly
        @Since("1.4.0.0-PN")
        Boolean deprecated;
    }
}