我最近将SpringCloud项目从Brixton升级到Finchley,并且一切正常。我当时使用的是Finchley.SR2,但没有任何问题,但是每当我将项目升级到Finchley.RELEASE(这是我所做的唯一更改)时,项目就无法启动。
原因是项目找到了AmazonS3Client
Bean:
...Unsatisfied dependency expressed through constructor parameter 0;
nested exception is
org.springframework.beans.factory.NoSuchBeanDefinitionException:
No qualifying bean of type 'com.amazonaws.services.s3.AmazonS3Client' available:
expected at least 1 bean which qualifies as autowire candidate.
Dependency annotations: {}
这些是我以前的相关配置和类:
build.gradle
buildscript {
ext {
springBootVersion = '2.0.2.RELEASE'
}
...
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath('io.spring.gradle:dependency-management-plugin:1.0.5.RELEASE')
}
}
apply plugin: 'java'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-dependencies:Finchley.SR2"
}
}
dependencies {
...
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.cloud:spring-cloud-starter-aws')
compile('org.springframework.cloud:spring-cloud-starter-config'
...
}
...
S3Config.java (创建AmazonS3 / AmazonS3Client Bean的类)
...
@Configuration
public class S3Config {
@Bean
public AmazonS3 amazonS3() {
return AmazonS3ClientBuilder.standard()
.withCredentials(new DefaultAWSCredentialsProviderChain())
.build();
}
}
StorageService (找不到Bean的类)
...
@Service
public class StorageService {
private final AmazonS3Client amazonS3Client;
@Autowired
public StorageService(AmazonS3Client amazonS3Client) {
this.amazonS3Client = amazonS3Client;
}
...
}
这是我升级到Finchley时对 build.gradle 文件所做的唯一更改。发布:
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-dependencies:Finchley.RELEASE"
}
}
我尝试寻找任何缺少的库并调整所有可以找到的配置,但是似乎没有任何作用。
答案 0 :(得分:0)
在与Spring维护者简短交谈之后,a solution was found。
我似乎错了,因为应该总是将AmazonS3
的Bean视为AmazonS3Client
Bean,因为一个实现了另一个。能够在以前的Spring版本上运行真是太幸运了。
创建AmazonS3Client
的正确方法如下:
@Configuration
public class S3Config {
@Bean
public static AmazonS3Client amazonS3Client() {
return (AmazonS3Client) AmazonS3ClientBuilder.standard()
.withCredentials(new DefaultAWSCredentialsProviderChain())
.build();
}
}