Spring Web Flux與Reactive Mongo db無法正常工作（Spring Boot 2.0.0 SNAPSHOT）

我在start.spring.io上創建了spring boot項目（2.0.0 SNAPSHOT）。我選擇了Reactive Web（Flux）和Reactive MongoDB作爲依賴關係。Spring Web Flux與Reactive Mongo db無法正常工作（Spring Boot 2.0.0 SNAPSHOT）

這是我的pom.xml文件看起來像：

<?xml version="1.0" encoding="UTF-8"?> 
... 
<groupId>com.example</groupId> 
<artifactId>demo</artifactId> 
<version>0.0.1-SNAPSHOT</version> 
<packaging>jar</packaging> 

<name>demo</name> 
<description>Demo project for Spring Boot</description> 

<parent> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-parent</artifactId> 
    <version>2.0.0.BUILD-SNAPSHOT</version> 
    <relativePath/> <!-- lookup parent from repository --> 
</parent> 

<properties> 
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 
    <java.version>1.8</java.version> 
</properties> 

<dependencies> 

    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-webflux</artifactId> 
    </dependency> 

    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId> 
    </dependency> 

    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-test</artifactId> 
     <scope>test</scope> 
    </dependency> 

</dependencies> 

<build> 
    <plugins> 
     <plugin> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-maven-plugin</artifactId> 
     </plugin> 
    </plugins> 
</build> 

<repositories> 
    <repository> 
     <id>spring-snapshots</id> 
     <name>Spring Snapshots</name> 
     <url>https://repo.spring.io/snapshot</url> 
     <snapshots> 
      <enabled>true</enabled> 
     </snapshots> 
    </repository> 
    <repository> 
     <id>spring-milestones</id> 
     <name>Spring Milestones</name> 
     <url>https://repo.spring.io/milestone</url> 
     <snapshots> 
      <enabled>false</enabled> 
     </snapshots> 
    </repository> 
</repositories> 

<pluginRepositories> 
    <pluginRepository> 
     <id>spring-snapshots</id> 
     <name>Spring Snapshots</name> 
     <url>https://repo.spring.io/snapshot</url> 
     <snapshots> 
      <enabled>true</enabled> 
     </snapshots> 
    </pluginRepository> 
    <pluginRepository> 
     <id>spring-milestones</id> 
     <name>Spring Milestones</name> 
     <url>https://repo.spring.io/milestone</url> 
     <snapshots> 
      <enabled>false</enabled> 
     </snapshots> 
    </pluginRepository> 
</pluginRepositories>

當我運行./mvnw spring-boot:run我得到這個異常：

java.lang.IllegalStateException: java.lang.NullPointerException 
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.stopAndReleaseReactiveWebServer(ReactiveWebServerApplicationContext.java:152) ~[spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:52) ~[spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:809) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:404) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:347) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1263) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1252) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at com.example.DemoApplication.main(DemoApplication.java:10) [classes/:na] 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121] 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_121] 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121] 
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121] 
at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:527) [spring-boot-maven-plugin-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121] Caused by: java.lang.NullPointerException: null 
at org.springframework.boot.web.embedded.netty.NettyWebServer.stop(NettyWebServer.java:113) ~[spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.stopAndReleaseReactiveWebServer(ReactiveWebServerApplicationContext.java:148) ~[spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 
... 13 common frames omitted [WARNING] java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:527) 
at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.IllegalStateException: java.lang.NullPointerException 
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.stopAndReleaseReactiveWebServer(ReactiveWebServerApplicationContext.java:152) 
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:52) 
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:809) 
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:404) 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:347) 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1263) 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1252) 
at com.example.DemoApplication.main(DemoApplication.java:10) 
... 6 more Caused by: java.lang.NullPointerException 
at org.springframework.boot.web.embedded.netty.NettyWebServer.stop(NettyWebServer.java:113) 
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.stopAndReleaseReactiveWebServer(ReactiveWebServerApplicationContext.java:148)

請注意，如果刪除spring-boot-starter-data-mongodb-reactive依賴項，應用程序將運行。

來源

2017-04-24 Ivan Dugalic

此問題已修復。快照:)期待穩定版本... –

此問題已修復。錯誤不再發生。使用快照庫（Spring），它們最近已經更新。

來源

2017-05-16 20:49:33

我也面臨同樣的問題。哪個版本的反應型mongo有這個問題修復？ –

Spring Web Flux與Reactive Mongo db無法正常工作（Spring Boot 2.0.0 SNAPSHOT）

回答

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