Learning Spring Boot 2.0, Second edition, published by Packt

License: MIT License

Java 90.95% CSS 0.67% HTML 7.92% Shell 0.46%

learning-spring-boot-2.0-second-edition's Introduction

Learning Spring Boot 2.0 - Second Edition

This is the code repository for Learning Spring Boot 2.0 - Second Edition, published by Packt. It contains all the supporting project files necessary to work through the book from start to finish.

About the Book

Spring Boot provides a variety of features that address today's business needs along with today's scalable requirements. In this book, you will learn how to leverage powerful databases and Spring Boot's state-of-the-art WebFlux framework. This practical guide will help you get up and running with all the latest features of Spring Boot, especially the new Reactor-based toolkit.

Instructions and Navigation

All of the code is organized into folders. Each folder starts with a number followed by the application name. For example, Chapter02.

The code will look like the following:

public interface MyRepository {
  List<Image> findAll();
}

Spring Boot 2.0 requires Java Developer Kit (JDK) 8 or higher
A modern IDE (IntelliJ IDEA or Spring Tool Suite) is recommended
RabbitMQ 3.6 or higher must be installed (check out https://www.rabbitmq.com/download.html, or, when using Mac Homebrew, brew install RabbitMQ)
MongoDB 3.0 or higher must be installed (check out https://www.mongodb.com/download-center, or, when using Mac Homebrew, brew install MongoDB)

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learning-spring-boot-2.0-second-edition's Issues

flux fluent by example in Korean translation

It is the source content registered on page 73 of Korean translation.
The return has been changed, but I want you to tell me if it's a different version or a typo.

Flux.just("alpha", "bravo", "charlie")
.map(String::toUpperCase)
.flatMap(s -> Flux.fromArray(s.split("")))
.groupBy(String::toString)
// .sort((s1, s2) -> s1.key().compareTo(s2.key()));
// .flatMap(group -> Mono.just((group.key()).zipWith(group.count()))

        Mono.just(): Mono<T>

        will return Mono<Void>
        Mono.just().and(): Mono<Void>
        .flatMap(group -> Mono.just(group.key()).and(group.count()))

        .map(keyAndCount -> keyAndCount.getT1() + " => " + keyAndCount.getT2())
        .subscribe(System.out::println);

Chapter 2: Response status 405 with reason "Request method 'POST' not supported"

When "delete" image, got Response status 405 with reason "Request method 'POST' not supported"

The delete post redirect to / GET.

Chapter 03: ChannelOperation terminal stack with Netty and WebFlux

I'm working through Learning Spring Boot 2.0 by Greg L. Turnquist and I'm getting a continuous spewing of errors with no idea how to debug them or even find them. I've just finished Chapter 3 and any time I do anything on the site I get the following error:

2019-07-22 19:57:58.245 DEBUG 17404 --- [ctor-http-nio-3] r.n.http.server.HttpServerOperations     : [id: 0xbcb056a7, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:52374] Last HTTP response frame
2019-07-22 19:57:58.245 DEBUG 17404 --- [ctor-http-nio-3] r.n.http.server.HttpServerOperations     : [id: 0xbcb056a7, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:52374] Decreasing pending responses, now 0
2019-07-22 19:57:58.245 DEBUG 17404 --- [ctor-http-nio-3] r.n.http.server.HttpServerOperations     : [id: 0xbcb056a7, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:52374] Last HTTP packet was sent, terminating the channel
2019-07-22 19:57:58.246 TRACE 17404 --- [ctor-http-nio-3] reactor.netty.channel.ChannelOperations  : [id: 0xbcb056a7, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:52374] Disposing ChannelOperation from a channel

java.lang.Exception: ChannelOperation terminal stack
	at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:391) ~[reactor-netty-0.8.8.RELEASE.jar:0.8.8.RELEASE]
	at reactor.netty.http.server.HttpServerOperations.cleanHandlerTerminate(HttpServerOperations.java:519) ~[reactor-netty-0.8.8.RELEASE.jar:0.8.8.RELEASE]
	at reactor.netty.http.server.HttpTrafficHandler.operationComplete(HttpTrafficHandler.java:313) ~[reactor-netty-0.8.8.RELEASE.jar:0.8.8.RELEASE]
	at reactor.netty.http.server.HttpTrafficHandler.operationComplete(HttpTrafficHandler.java:54) ~[reactor-netty-0.8.8.RELEASE.jar:0.8.8.RELEASE]
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:502) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:495) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:474) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:415) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:540) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:529) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:101) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.internal.PromiseNotificationUtil.trySuccess(PromiseNotificationUtil.java:48) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.ChannelOutboundBuffer.safeSuccess(ChannelOutboundBuffer.java:715) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.ChannelOutboundBuffer.remove(ChannelOutboundBuffer.java:270) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.ChannelOutboundBuffer.removeBytes(ChannelOutboundBuffer.java:350) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:428) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:939) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:360) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$1.run(AbstractNioByteChannel.java:54) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:405) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:906) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.36.Final.jar:4.1.36.Final]
	at java.base/java.lang.Thread.run(Thread.java:835) ~[na:na]

I could just clone his repository (and I probably will) but I would like to know what the problem is here and how I can identify the root of similar problems should I encounter them again. None of the files in the stack trace are my code so I don't know what code snippets I could provide you to help.

Chapter02 - InputStreamSource is abstract; cannot be instantiated

Learning-Spring-Boot-2.0-Second-Edition/Chapter02/part1/src/main/java/com/greglturnquist/learningspringboot/HomeController.java

Line 71 in b190a5f

.body(new InputStreamResource(

Chapter1 - Problem in init method of LoadDatabase

I'm optaining this compilation error:

Error:(20, 29) java: incompatible types: cannot infer type-variable(s) R,S
(argument mismatch; bad return type in method reference
S cannot be converted to org.reactivestreams.Publisher<? extends R>)

In the method init of the LoadDatabase class:

@Bean
    CommandLineRunner init(ChapterRepository repository) {
        return args -> {
            Flux.just(
                    new Chapter("Quick Start with Java"),
                    new Chapter("Reactive Web with Spring Boot"),
                    new Chapter("...and more!"))
                    .flatMap(repository::save)
                    .subscribe(System.out::println);
        };
    }

The problem is in the line: .flatMap(repository::save)

Any idea why this happends?

Chapter 3: Image.java:13: error: variable id not initialized in the default constructor

I get this error:

Image.java:13: error: variable id not initialized in the default constructor
        @Id final private String id;
                                              ^

Have I missed something?

Chapter 01: List of empty json objects with Lombok

Hello, there seems to be an issue when mapping the Flux result to json when the entities are using Lombok: I get [{}, {},{}] as a response (even with the provided code in this repository).

If I remove the Data annotation from the Chapter entity, and generate plain old getters and setters, there is no issue in the json response, the id and name fields do appear.

Chapter07: Unable to connect to Command Metric Stream

http://localhost:8080/hystrix.stream is unavailable.
This issue might be related to spring-cloud/spring-cloud-netflix#2785 I tried to put the following in application.yml:

management:
  endpoints:
    web:
      exposure:
        include: hystrix.stream

Alas, I had no success. http://localhost:8080/actuator/hystrix.stream is also unavailable.
May I know what I'm missing?

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