import com.google.gson.Gson;
import com.google.gson.JsonObject;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.plugin.messaging.PluginMessageListener;
// Small without error handling
public class ExamplePlugin extends JavaPlugin implements PluginMessageListener {
  private static final String CHANNEL = "vv:proxy_details";
  private static final Gson GSON = new Gson();
  @Override
  public void onEnable() {
    this.getServer().getMessenger().registerIncomingPluginChannel(this, CHANNEL, this);
  }
  @Override
  public void onDisable() {
    this.getServer().getMessenger().unregisterIncomingPluginChannel(this);
  }
  @Override
  public void onPluginMessageReceived(String channel, Player player, byte[] bytes) {
    if (!channel.equals(CHANNEL)) {
      return;
    }
    
    final JsonObject payload = GSON.fromJson(new String(bytes), JsonObject.class);
    final int version = payload.get("version").getAsInt();
    // Store into a custom player object
  }
}