背景

容器里配置兩個RedisConnectFactory實例，報錯如下

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

開始以為是配置的bean沒有命名，都仔仔細(xì)細(xì)檢查過了，重啟N遍，依然出現(xiàn)這個問題，然后我就在異常里面看到 redisTemplate這個Bean，搜了項目里的配置，我并沒有這個，所以懷疑是RedisAutoConfiguration里面自動加載了一個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源碼發(fā)現(xiàn)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這個注釋表示如果容器沒有這個類則加載，我的程序沒有定義redisTemplate的Bean,所以這個地方自動加載了，但是容器里又有兩個redisConnectionFactory，所以才報了上面的錯誤

結(jié)論

將配置的其中一個redisTemplate Bean的名稱改為redisTemplate，這樣RedisAutoConfiguration就不會再加載默認(rèn)的了