我正在使用Spring Boot 2.1.1，Spring Data REST，Spring HATEOAS，Hibernate。
在我的timerFinished类中，我创建了一个自定义@Configuration：
RestTemplate我在@Component中使用此restTemplate：
@Configuration
@EnableRetry
@EnableTransactionManagement
@EnableJpaAuditing(auditorAwareRef = "springSecurityAuditorAware")
public class CustomConfiguration {
@Bean
public RestTemplate restTemplate() {
RestTemplate restTemplate = new RestTemplateBuilder().setConnectTimeout(httpClientConnectionTimeout)
.setReadTimeout(httpClientReadTimeout).build();
ObjectMapper objectMapper = new ObjectMapper();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter(objectMapper));
restTemplate.getMessageConverters().add(new StringHttpMessageConverter());
restTemplate.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
return restTemplate;
}
直到Spring Boot 2.0.3一切正常，但是如果我更新到Spring 2.0.4或更高版本，当我尝试运行我的应用程序时，会遇到以下异常：
@Component
public class TenantRestClient {
@Autowired
private RestTemplate restTemplate;
public Tenant register(Tenant tenant) {
//my stuff here
}
我试图：
14/12/2018 09:09:55,442 INFO main testServerApplication:50 - Starting testServerApplication on SVILUPPO1 with PID 10612 (C:\Users\Daniele\Documents\workspaceREST2\test-server\target\classes started by Daniele in C:\Users\Daniele\Documents\workspaceREST2\test-management-server)
14/12/2018 09:09:55,448 DEBUG main testServerApplication:53 - Running with Spring Boot v2.1.1.RELEASE, Spring v5.1.3.RELEASE
14/12/2018 09:09:55,448 INFO main testServerApplication:679 - The following profiles are active: prod
14/12/2018 09:10:02,101 ERROR main TomcatStarter:62 - Error starting Tomcat context. Exception: org.springframework.beans.factory.UnsatisfiedDependencyException. Message: Error creating bean with name 'webSecurityConfiguration': Unsatisfied dependency expressed through method 'setContentNegotationStrategy' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration': Unsatisfied dependency expressed through method 'setConfigurers' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'webMvcConfiguration': Unsatisfied dependency expressed through field 'tenantRestClient'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tenantRestClient': Unsatisfied dependency expressed through field 'restTemplate'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'restTemplate' defined in class path resource [cloud/test/server/config/CustomConfiguration.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.hateoas.config.ConverterRegisteringWebMvcConfigurer' available: expected single matching bean but found 2: org.springframework.hateoas.config.ConverterRegisteringWebMvcConfigurer#0,org.springframework.hateoas.config.ConverterRegisteringWebMvcConfigurer#1
14/12/2018 09:10:02,124 WARN main WebappClassLoaderBase:173 - The web application [ROOT] appears to have started a thread named [lettuce-eventExecutorLoop-1-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
io.netty.util.concurrent.SingleThreadEventExecutor.takeTask(SingleThreadEventExecutor.java:251)
io.netty.util.concurrent.DefaultEventExecutor.run(DefaultEventExecutor.java:64)
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:748)
14/12/2018 09:10:02,128 WARN main AnnotationConfigServletWebServerApplicationContext:554 - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
14/12/2018 09:10:02,163 ERROR main LoggingFailureAnalysisReporter:42 -
***************************
APPLICATION FAILED TO START
***************************
Description:
Field restTemplate in cloud.test.server.rest.clients.TenantRestClient required a single bean, but 2 were found:
- org.springframework.hateoas.config.ConverterRegisteringWebMvcConfigurer#0: defined in null
- org.springframework.hateoas.config.ConverterRegisteringWebMvcConfigurer#1: defined in null
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
Process finished with exit code 1
类中的@Qualifier上设置一个restTemplate @Configuration类中删除bean restTemplate 第一次尝试并没有改变任何东西，而后者却出现了这个奇怪的错误：
@Configuration您是否有解决此奇怪错误的提示？而且...为什么只是更新到Spring Boot> = 2.0.4（相同的代码）会发生这种情况？
答案 0 :(得分：1)
请尝试使用Spring Boot项目的application.properties中的以下属性。然后，它将允许您使用具有相同名称的自定义项覆盖现有的Bean定义。
spring.main.allow-bean-definition-overriding=true
答案 1 :(得分：0)
尝试用restTemplate注解@Primary bean。
@Bean
@Primary
public RestTemplate restTemplate() {
RestTemplate restTemplate = new RestTemplateBuilder().setConnectTimeout(httpClientConnectionTimeout)
.setReadTimeout(httpClientReadTimeout).build();
ObjectMapper objectMapper = new ObjectMapper();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter(objectMapper));
restTemplate.getMessageConverters().add(new StringHttpMessageConverter());
restTemplate.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
return restTemplate;
}