记一次gateway微服务启动报错

 这个gateway微服务之前启动没题，改了一下父依赖就启动不了了。

之前的父依赖是springboot-parent，后来我想把这个微服务改在我项目的父依赖下，就改了一下父依赖。

    <parent>
            
        <artifactId>ac-mall-cloudartifactId>
        <groupId>org.examplegroupId>
        <version>1.0-SNAPSHOTversion>
    parent>

改完就报错了。 

错误信息如下：

Description:
 
Parameter 0 of method redisRateLimiter in org.springframework.cloud.gateway.config.GatewayRedisAutoConfiguration required a single bean, but 2 were found:
	- reactiveStringRedisTemplate: defined by method 'reactiveStringRedisTemplate' in class path resource [org/springframework/boot/autoconfigure/data/redis/RedisReactiveAutoConfiguration.class]
	- stringReactiveRedisTemplate: defined by method 'stringReactiveRedisTemplate' in class path resource [org/springframework/cloud/gateway/config/GatewayRedisAutoConfiguration.class]
 
 
Action:
 
Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

大致意思就是在org.springframework.cloud.gateway.config.GatewayRedisAutoConfiguration这个配置类中有两个redisRateLimiter的实例，冲突了。然后我看了下引入的依赖的pom文件，又看了下其他子服务的pom文件，发现gateway微服务里的依赖和父服务里引入的依赖冲突了，多引了依赖。

下面是gateway微服务中的依赖：

"1.0" encoding="UTF-8"?>
<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">
    <parent>
            
        <artifactId>ac-mall-cloudartifactId>
        <groupId>org.examplegroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
 
    <groupId>org.acgroupId>
    <artifactId>gateway-serviceartifactId>
 
    <properties>
        <spring-cloud.version>Greenwich.SR3spring-cloud.version>
        <alibaba.cloud.version>2.1.0.RELEASEalibaba.cloud.version>
    properties>
 
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>${spring-cloud.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
 
            <dependency>
                <groupId>com.alibaba.cloudgroupId>
                <artifactId>spring-cloud-alibaba-dependenciesartifactId>
                <version>${alibaba.cloud.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>
    dependencyManagement>
 
        ......
    
project>

 下面是父依赖中的pom文件：

"1.0" encoding="UTF-8"?>
<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>4.0.0modelVersion>
 
    <groupId>org.examplegroupId>
    <artifactId>ac-mall-cloudartifactId>
    <version>1.0-SNAPSHOTversion>
 
        ......
 
    <packaging>pompackaging>
 
    <properties>
        <java.version>1.8java.version>
        <spring-cloud.version>Hoxton.SR8spring-cloud.version>
        <alibaba.cloud.version>2.2.5.RELEASEalibaba.cloud.version>
    properties>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-starter-parentartifactId>
                <version>${boot.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
 
            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>${spring-cloud.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
 
            <dependency>
                <groupId>com.alibaba.cloudgroupId>
                <artifactId>spring-cloud-alibaba-dependenciesartifactId>
                <version>${alibaba.cloud.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        
            ......
 
         dependencies>
     dependencyManagement>
          ......
   project>

 从这两个pom文件可以看到，在父依赖中已经引入了springcloud依赖和alibabacloud依赖，而且版本和gateway中的版本也不一样，把gateway微服务pom文件改成下面这种就可以启动了。

把所有父依赖pom中已经引入过的依赖注释掉就可以了。

"1.0" encoding="UTF-8"?>
<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">
    <parent>
            
        <artifactId>ac-mall-cloudartifactId>
        <groupId>org.examplegroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
 
    <groupId>org.acgroupId>
    <artifactId>gateway-serviceartifactId>
 
    
 
    
        
        ......
 
 project>