If you do not have JDK 11+ installed, the quick installation method is to download directly 
from Project Structure, Platform Settings, SDKs in the upper right corner of Idea

// zfoo protocol registration, can only be initialized once
ProtocolManager.initProtocol(Set.of(ComplexObject.class, ObjectA.class, ObjectB.class));

// serialization
ProtocolManager.write(byteBuf, complexObject);

// deserialization
var packet = ProtocolManager.read(byteBuf);

// Service provider, only need to add an annotation to the method, the interface will be automatically registered
@PacketReceiver
public void atUserInfoAsk(Session session, UserInfoAsk ask) {
}

// Consumers, synchronously requesting remote service, will block the current thread
var userInfoAsk = UserInfoAsk.valueOf(userId);
var answer = NetContext.getCosumer().syncAsk(userInfoAsk, UserInfoAnswer.class, userId).packet();

// Consumers, asynchronously requesting remote service, and will still execute logic in the current thread after the asynchronous
NetContext.getCosumer()
                    .asyncAsk(userInfoAsk, UserInfoAnswer.class, userId)
                    .whenComplete(sm -> {
                        // do something
                    );

// Pass in the class file that needs to be updated
HotSwapUtils.hotswapClass(bytes);

// You don't need to write sql and any configuration yourself, define a table in the database directly through annotation definitions
@EntityCache
public class UserEntity implements IEntity<Long> {
    @Id
    private long id;
    private String name;
}

// update database data
entityCaches.update(userEntity);

// To receive an event, you only need to add an annotation to the method and the method will be automatically listen for the event
@EventReceiver
public void onMyNoticeEvent(MyNoticeEvent event) {
    // do something
}

// fire an event
EventBus.submit(MyNoticeEvent.valueOf("My event"));

@Scheduler(cron = "0/1 * * * * ?")
public void cronSchedulerPerSecond() {
    // do something
}