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spring - Spring Cloud Gateway 服务器启动时出现问题？

问题描述

我有一个简单的 Spring Cloud 微服务系统。我在应用程序中有一个 Cloud Gateway 服务器。它向 Eureka 注册，获取 Config Server 的地址并为自己下载配置。

这个网关服务将是登录的地方，它也会找到正确的微服务，客户端真正想要调用的。它使用 Redis 进行会话处理和分发。

但是在启动过程中，我看到了这个失败：

***************************
APPLICATION FAILED TO START
***************************

Description:

The bean 'sessionRepository', defined in class path resource     [org/springframework/boot/autoconfigure/session/RedisReactiveSessionConfiguration$SpringBootRedisWebSessionConfiguration.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/session/data/redis/config/annotation/web/http/RedisHttpSessionConfiguration.class] and overriding is disabled.

Action:

Consider renaming one of the beans or enabling overriding by setting  spring.main.allow-bean-definition-overriding=true

[WARNING] 
java.lang.reflect.InvocationTargetException
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:566)
at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run (AbstractRunMojo.java:558)
at java.lang.Thread.run (Thread.java:834)

Caused by: org.springframework.beans.factory.support.BeanDefinitionOverrideException: Invalid bean definition with name 'sessionRepository' defined in class path resource  [org/springframework/boot/autoconfigure/session/RedisReactiveSessionConfiguration$SpringBootRedisWebSessionConfiguration.class]: Cannot register bean definition [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.session.RedisReactiveSessionConfiguration$SpringBootRedisWebSessionConfiguration; factoryMethodName=sessionRepository; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/session/RedisReactiveSessionConfiguration$SpringBootRedisWebSessionConfiguration.class]] for bean 'sessionRepository': There is already [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration; factoryMethodName=sessionRepository; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/session/data/redis/config/annotation/web/http/RedisHttpSessionConfiguration.class]] bound.

at  org.springframework.beans.factory.support.DefaultListableBeanFactory.registerBeanDefinition (DefaultListableBeanFactory.java:894)

这是网关应用程序的 pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<artifactId>elszamolas-gateway</artifactId>
<packaging>jar</packaging>

<name>elszamolas-gateway</name>
<description>TAO elszamolas GATEWAY service</description>

<parent>
    <groupId>com.besztercekk.tao</groupId>
    <artifactId>tao-elszamolas</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <relativePath>../pom.xml</relativePath>
</parent>


<dependencies>
    <!-- Spring Cloud Gateway service -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>

    <!-- Spring Cloud Eureka client -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>

    <!-- Spring Cloud config client -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-config-client</artifactId>
    </dependency>

    <!-- Spring Boot reactive web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>

    <!-- Spring Boot share session via Redis -->
    <dependency>
        <groupId>org.springframework.session</groupId>
        <artifactId>spring-session-data-redis</artifactId>
    </dependency>

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

    <!-- Servlet API -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <scope>provided</scope>
    </dependency>
</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
</project>

这是它的父 pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.besztercekk.tao</groupId>
<artifactId>tao-elszamolas</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>

<name>elszamolas</name>
<description>TAO elszámolás szülő project</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.1.RELEASE</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>
    <spring-cloud.version>Greenwich.M3</spring-cloud.version>
    <spring-session.version>1.3.4.RELEASE</spring-session.version>
    <spring-session-core.version>2.1.2.RELEASE</spring-session-core.version>
</properties>

<modules>
    <module>elszamolas-config</module>
    <module>elszamolas-discovery</module>
    <module>elszamolas-gateway</module>
</modules>

<dependencies>

    <!-- Common Spring Boot Dependencies -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

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

    <!-- Spring Security -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>

    <!-- Java 11 required dependencies -->
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
    </dependency>
    <dependency>
        <groupId>com.sun.xml.bind</groupId>
        <artifactId>jaxb-core</artifactId>
        <version>2.3.0</version>
    </dependency>
    <dependency>
        <groupId>com.sun.xml.bind</groupId>
        <artifactId>jaxb-impl</artifactId>
        <version>2.3.1</version>
    </dependency>
    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1.1</version>
    </dependency>
</dependencies>

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

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <release>11</release>
            </configuration>
        </plugin>   
    </plugins>
</build>
</project>

任何帮助将不胜感激。我真的不知道为什么这个“ sessionRepository ” bean 从多个地方多次加载。我是否混淆了必要的依赖项？

标签： springgateway

解决方案

更新：

我仔细研究了这个问题。异常很清楚 bean 被调用，它说 bean sessionRepository被定义了两次。如果您检查它们定义的类以及它们的来源，您会发现其中一个来自自动配置器，另一个来自 Redis 会话数据依赖项。

在这一点上，您似乎需要允许 bean 覆盖，您可以通过将其添加到bootstrap.yml轻松做到这一点：

spring:
  main:
    allow-bean-definition-overriding: true

但是，如果您执行其他几个例外情况，您将需要面对。这些家伙默认将此选项设置为false是有道理的。以下是您 cab 获得的示例异常：

2018-12-20 00:37:22.965 ERROR 3089 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisMessageListenerContainer' defined in class path resource     org/springframework/session/data/redis/config/annotation/web/http/RedisHttpSessionConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.listener.RedisMessageListenerContainer]: Factory method 'redisMessageListenerContainer' threw exception; nested exception is java.lang.IllegalStateException: @Bean method RedisHttpSessionConfiguration.sessionRepository called as bean reference for type [org.springframework.session.data.redis.RedisOperationsSessionRepository] but overridden by non-compatible bean instance of type [org.springframework.session.data.redis.ReactiveRedisOperationsSessionRepository]. Overriding bean of same name declared in: class path resource [org/springframework/boot/autoconfigure/session/RedisReactiveSessionConfiguration$SpringBootRedisWebSessionConfiguration.class]

如果我错了，请纠正我。我真的很感激。但是，当您需要 Spring Boot 自动配置功能时，您就不能使用 Redis 进行会话存储和分发到微服务。它只是没有一起工作。有点难以置信，因为当您真的不想在每个微服务中验证您的用户时，您必须在 Spring Boot 2.1.1 应用程序中使用一些东西。

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