I'm new to Spring Boot and I bought the book for Spring Boot 2.0 by Greg Turnsquit. In chapter 1 there is a simple application in which if I take a look to http://localhost:8080/chapters URL I'll be able to see the chapter list.
The error I'm having is that on the console the app prints the hashcode of the classes in the repository. In the web browser the app prints a dictionary with three empty elements.
Code Example: https://github.com/learning-spring-boot/learning-spring-boot-2nd-edition-code/tree/master/1
Chapter Controller
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();
}
}
Chapter Repository
package com.greglturnquist.learningspringboot;
import org.springframework.data.repository.reactive.ReactiveCrudRepository;
public interface ChapterRepository
extends ReactiveCrudRepository<Chapter, String> {
}
Loading of Database
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);
};
}
}
Fixes I tried
I know sometimes things can be cached in the web browser. I have killed the services running on the port the application is running in. I've also taken a look into the stack trace and there is no error relating to the app itself other than printing the hash of the Chapter objects and not the object information themselves. I'm assuming it might be related to web-flux. However, I'm unsure how the Chapter Repository interacts with web-flux and the embedded MongoDB.
Thanks in advance for any tips and suggestions.
Console log
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: 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
