Я новичок в Spring Boot и купил книгу Грега Тернсквита для Spring Boot 2.0. В главе 1 есть простое приложение, в котором, если я посмотрю на http://localhost:8080/chapters URL, я смогу увидеть список глав.
У меня ошибка в том, что на консоли приложение печатает хеш-код классов в хранилище. В веб-браузере приложение печатает словарь с тремя пустыми элементами.
Пример кода: https://github.com/learning-spring-boot/learning-spring-boot-2nd-edition-code/tree/master/1
Контроллер главы
package com.greglturnquist.learningspringboot;
import reactor.core.publisher.Flux;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ChapterController {
private final ChapterRepository repository;
public ChapterController(ChapterRepository repository) {
this.repository = repository;
}
@GetMapping("/chapters")
public Flux<Chapter> listing() {
return repository.findAll();
}
}
Хранилище глав
package com.greglturnquist.learningspringboot;
import org.springframework.data.repository.reactive.ReactiveCrudRepository;
public interface ChapterRepository
extends ReactiveCrudRepository<Chapter, String> {
}
Загрузка базы данных
package com.greglturnquist.learningspringboot;
import reactor.core.publisher.Flux;
import org.springframework.boot.CommandLineRunner;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class LoadDatabase {
@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);
};
}
}
Исправления, которые я пытался
Я знаю, что иногда вещи могут быть кэшированы в веб-браузере. Я убил службы, работающие на порте, на котором запущено приложение. Я также изучил трассировку стека, и нет ошибок, связанных с самим приложением, кроме печати хеша объектов Chapter, а не информации об объекте. самих себя. Я предполагаю, что это может быть связано с веб-потоком. Однако я не уверен, как репозиторий глав взаимодействует с веб-потоком и встроенным MongoDB.
Заранее спасибо за любые советы и предложения.
Журнал консоли
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.0.M5)
2018-06-28 11:21:33.581 INFO 1804 --- [ main] c.g.l.LearningSpringBootApplication : Starting LearningSpringBootApplication on ARD-B3LM5R1 with PID 1804 (C:\DevTraining\Learning-Spring-Boot-2.0-Second-Edition\Chapter01\part1\out\production\classes started by nmartinez in C:\DevTraining\Learning-Spring-Boot-2.0-Second-Edition\Chapter01\part1)
2018-06-28 11:21:33.584 DEBUG 1804 --- [ main] c.g.l.LearningSpringBootApplication : Running with Spring Boot v2.0.0.M5, Spring v5.0.0.RELEASE
2018-06-28 11:21:33.585 INFO 1804 --- [ main] c.g.l.LearningSpringBootApplication : No active profile set, falling back to default profiles: default
2018-06-28 11:21:33.680 INFO 1804 --- [ main] .r.c.ReactiveWebServerApplicationContext : Refreshing org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext@5ccddd20: startup date [Thu Jun 28 11:21:33 EDT 2018]; root of context hierarchy
2018-06-28 11:21:34.969 WARN 1804 --- [ main] o.h.v.m.ParameterMessageInterpolator : HV000184: ParameterMessageInterpolator has been chosen, EL interpolation will not be supported
2018-06-28 11:21:35.383 WARN 1804 --- [ main] ion$DefaultTemplateResolverConfiguration : Cannot find template location: classpath:/templates/ (please add some templates or check your Thymeleaf configuration)
2018-06-28 11:21:35.575 INFO 1804 --- [ main] s.w.r.r.m.a.RequestMappingHandlerMapping : Mapped "{[/chapters],methods=[GET]}" onto public reactor.core.publisher.Flux<com.greglturnquist.learningspringboot.Chapter> com.greglturnquist.learningspringboot.ChapterController.listing()
2018-06-28 11:21:35.578 INFO 1804 --- [ main] s.w.r.r.m.a.RequestMappingHandlerMapping : Mapped "{[],methods=[GET]}" onto public java.lang.String com.greglturnquist.learningspringboot.HomeController.greeting(java.lang.String)
2018-06-28 11:21:35.664 INFO 1804 --- [ main] o.s.w.r.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.reactive.resource.ResourceWebHandler]
2018-06-28 11:21:35.664 INFO 1804 --- [ main] o.s.w.r.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.reactive.resource.ResourceWebHandler]
2018-06-28 11:21:35.684 WARN 1804 --- [ main] o.h.v.m.ParameterMessageInterpolator : HV000184: ParameterMessageInterpolator has been chosen, EL interpolation will not be supported
2018-06-28 11:21:35.753 INFO 1804 --- [ main] o.s.w.r.r.m.a.ControllerMethodResolver : Looking for @ControllerAdvice: org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext@5ccddd20: startup date [Thu Jun 28 11:21:33 EDT 2018]; root of context hierarchy
2018-06-28 11:21:36.812 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : note: noprealloc may hurt performance in many applications
2018-06-28 11:21:36.813 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.710-0400 I CONTROL [main] Hotfix KB2731284 or later update is not installed, will zero-out data files
2018-06-28 11:21:36.813 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] MongoDB starting : pid=6980 port=51561 dbpath=C:\Users\NMARTI~1\AppData\Local\Temp\embedmongo-db-250ddd2d-2dba-4972-a86e-decdcbe4df3b 64-bit host=ARD-B3LM5R1
2018-06-28 11:21:36.813 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] targetMinOS: Windows 7/Windows Server 2008 R2
2018-06-28 11:21:36.813 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] db version v3.2.2
2018-06-28 11:21:36.813 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] git version: 6e71d0d568e134c029203593b00a0103e7cdf30b
2018-06-28 11:21:36.813 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] allocator: tcmalloc
2018-06-28 11:21:36.813 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] modules: none
2018-06-28 11:21:36.813 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] build environment:
2018-06-28 11:21:36.814 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] distmod: 2008plus
2018-06-28 11:21:36.814 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] distarch: x86_64
2018-06-28 11:21:36.814 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] target_arch: x86_64
2018-06-28 11:21:36.814 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.712-0400 I CONTROL [initandlisten] options: { net: { bindIp: "127.0.0.1", http: { enabled: false }, port: 51561 }, security: { authorization: "disabled" }, storage: { dbPath: "C:\Users\NMARTI~1\AppData\Local\Temp\embedmongo-db-250ddd2d-2dba-4972-a86e-decdcbe4df3b", journal: { enabled: false }, mmapv1: { preallocDataFiles: false, smallFiles: true }, syncPeriodSecs: 0.0 } }
2018-06-28 11:21:36.814 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.718-0400 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=4G,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=0,log_size=2GB),statistics_log=(wait=0),,log=(enabled=false),
2018-06-28 11:21:36.860 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.859-0400 W STORAGE [initandlisten] Detected configuration for non-active storage engine mmapv1 when current storage engine is wiredTiger
2018-06-28 11:21:36.861 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.861-0400 I NETWORK [HostnameCanonicalizationWorker] Starting hostname canonicalization worker
2018-06-28 11:21:36.861 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.861-0400 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory 'C:/Users/NMARTI~1/AppData/Local/Temp/embedmongo-db-250ddd2d-2dba-4972-a86e-decdcbe4df3b/diagnostic.data'
2018-06-28 11:21:36.904 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:36.904-0400 I NETWORK [initandlisten] waiting for connections on port 51561
2018-06-28 11:21:36.904 INFO 1804 --- [ main] d.f.embed.process.runtime.Executable : start de.flapdoodle.embed.mongo.config.MongodConfigBuilder$ImmutableMongodConfig@3f1ddac2
2018-06-28 11:21:37.252 INFO 1804 --- [ main] org.mongodb.driver.cluster : Cluster created with settings {hosts=[localhost:51561], mode=MULTIPLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
2018-06-28 11:21:37.252 INFO 1804 --- [ main] org.mongodb.driver.cluster : Adding discovered server localhost:51561 to client view of cluster
2018-06-28 11:21:37.297 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:37.297-0400 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51563 #1 (1 connection now open)
2018-06-28 11:21:37.323 INFO 1804 --- [localhost:51561] org.mongodb.driver.connection : Opened connection [connectionId{localValue:1, serverValue:1}] to localhost:51561
2018-06-28 11:21:37.326 INFO 1804 --- [localhost:51561] org.mongodb.driver.cluster : Monitor thread successfully connected to server with description ServerDescription{address=localhost:51561, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersion{versionList=[3, 2, 2]}, minWireVersion=0, maxWireVersion=4, maxDocumentSize=16777216, roundTripTimeNanos=831762}
2018-06-28 11:21:37.328 INFO 1804 --- [localhost:51561] org.mongodb.driver.cluster : Discovered cluster type of STANDALONE
2018-06-28 11:21:37.731 INFO 1804 --- [ main] org.mongodb.driver.cluster : Cluster created with settings {hosts=[localhost:51561], mode=MULTIPLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
2018-06-28 11:21:37.731 INFO 1804 --- [ main] org.mongodb.driver.cluster : Adding discovered server localhost:51561 to client view of cluster
2018-06-28 11:21:37.734 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:37.734-0400 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51564 #2 (2 connections now open)
2018-06-28 11:21:37.737 INFO 1804 --- [localhost:51561] org.mongodb.driver.connection : Opened connection [connectionId{localValue:2, serverValue:2}] to localhost:51561
2018-06-28 11:21:37.737 INFO 1804 --- [localhost:51561] org.mongodb.driver.cluster : Monitor thread successfully connected to server with description ServerDescription{address=localhost:51561, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersion{versionList=[3, 2, 2]}, minWireVersion=0, maxWireVersion=4, maxDocumentSize=16777216, roundTripTimeNanos=336344}
2018-06-28 11:21:37.738 INFO 1804 --- [localhost:51561] org.mongodb.driver.cluster : Discovered cluster type of STANDALONE
2018-06-28 11:21:38.384 INFO 1804 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-06-28 11:21:38.669 INFO 1804 --- [ctor-http-nio-1] r.ipc.netty.tcp.BlockingNettyContext : Started HttpServer on /0:0:0:0:0:0:0:0:9001
2018-06-28 11:21:38.669 INFO 1804 --- [ main] o.s.b.web.embedded.netty.NettyWebServer : Netty started on port(s): 9001
2018-06-28 11:21:38.736 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:38.736-0400 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51565 #3 (3 connections now open)
2018-06-28 11:21:38.737 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:38.737-0400 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51566 #4 (4 connections now open)
2018-06-28 11:21:38.739 INFO 1804 --- [ Thread-12] o.s.b.a.mongo.embedded.EmbeddedMongo : 2018-06-28T11:21:38.738-0400 I NETWORK [initandlisten] connection accepted from 127.0.0.1:51567 #5 (5 connections now open)
2018-06-28 11:21:38.740 INFO 1804 --- [ main] c.g.l.LearningSpringBootApplication : Started LearningSpringBootApplication in 5.693 seconds (JVM running for 6.278)
2018-06-28 11:21:38.750 INFO 1804 --- [ Thread-17] org.mongodb.driver.connection : Opened connection [connectionId{localValue:4, serverValue:4}] to localhost:51561
2018-06-28 11:21:38.750 INFO 1804 --- [ Thread-20] org.mongodb.driver.connection : Opened connection [connectionId{localValue:5, serverValue:5}] to localhost:51561
2018-06-28 11:21:38.750 INFO 1804 --- [ Thread-18] org.mongodb.driver.connection : Opened connection [connectionId{localValue:3, serverValue:3}] to localhost:51561
com.greglturnquist.learningspringboot.Chapter@2043a52c
com.greglturnquist.learningspringboot.Chapter@5919de11
com.greglturnquist.learningspringboot.Chapter@393e1e5