背景
容器里配置两个RedisConnectFactory实例，报错如下
Description:
Parameter 0 of method redisTemplate in org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration$RedisConfiguration required a single bean, but 2 were found:
- desCacheJedisConnectionFactory: defined by method 'desCachejedisConnectionFactory' in class path resource [com/qingqing/des/config/RedisConfig.class]
- apiDesJedisConnectionFactory: defined by method 'apiDesJedisConnectionFactory' in class path resource [com/qingqing/des/config/RedisConfig.class]
Action:
Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed
分析
开始以为是配置的bean没有命名，都仔仔细细检查过了，重启N遍，依然出现这个问题，然后我就在异常里面看到 redisTemplate这个Bean，搜了项目里的配置，我并没有这个，所以怀疑是RedisAutoConfiguration里面自动加载了一个redisTemplate.
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'redisTemplate' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/RedisAutoConfiguration$RedisConfiguration.class]: Unsatisfied dependency expressed through method 'redisTemplate' parameter 0; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.data.redis.connection.RedisConnectionFactory' available: expected single matching bean but found 2: desCacheJedisConnectionFactory,apiDesJedisConnectionFactory
看RedisAutoConfiguration源码发现一段：
/**
* Standard Redis configuration.
*/
@Configuration
protected static class RedisConfiguration {
@Bean
@ConditionalOnMissingBean(name = "redisTemplate")
public RedisTemplate<Object, Object> redisTemplate(
RedisConnectionFactory redisConnectionFactory)
throws UnknownHostException {
RedisTemplate<Object, Object> template = new RedisTemplate<Object, Object>();
template.setConnectionFactory(redisConnectionFactory);
return template;
}
@Bean
@ConditionalOnMissingBean(StringRedisTemplate.class)
public StringRedisTemplate stringRedisTemplate(
RedisConnectionFactory redisConnectionFactory)
throws UnknownHostException {
StringRedisTemplate template = new StringRedisTemplate();
template.setConnectionFactory(redisConnectionFactory);
return template;
}
}
ConditionalOnMissingBean这个注释表示如果容器没有这个类则加载，我的程序没有定义redisTemplate的Bean,所以这个地方自动加载了，但是容器里又有两个redisConnectionFactory，所以才报了上面的错误
结论
将配置的其中一个redisTemplate Bean的名称改为redisTemplate，这样RedisAutoConfiguration就不会再加载默认的了
