redisCacheManager nested exception is java.lang.IllegalArgumentException: TTL duration must not be null!

最近在 SpringBoot 1.x 升级到 2.x 上遇到了不少异常。

项目越大，项目越老，升级 SpringBoot 带来的风险也越大。我在整个升级的过程中已经遇到了十几个冲突，报错，编译异常等问题。

但唯独，nested exception is java.lang.IllegalArgumentException: TTL duration must not be null! 这个问题，没百度到答案。

不得已，只能使用我的谷歌，有几篇英文记录了这个问题，我这里整理记录一下，方便其他网友排错！

CacheManager 在 SpringBoot 1.x 中的用法：

@Bean
public CacheManager redisCacheManager(RedisTemplate<?, ?> redisTemplate) {
    CacheManager cacheManager = new RedisCacheManager(redisTemplate);
    return cacheManager;
}

这种用法在 SpringBoot 2.x 中已经无法使用了。SpringBoot 2.x 用法：

@Bean
public CacheManager redisCacheManager(RedisConnectionFactory redisConnectionFactory) {
    RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
            .entryTtl(Duration.ofSeconds(null));
    return RedisCacheManager.builder(RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))
            .cacheDefaults(redisCacheConfiguration).build();
}

这个问题就产生在 entryTtl(null) 上。完整的异常信息如下：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisCacheManager' defined in class path resource [com/xttblog/config/RedisCacheConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cache.CacheManager]: Factory method 'redisCacheManager' threw exception; nested exception is java.lang.IllegalArgumentException: TTL duration must not be null!

解决办法就是设置 entryTtl，entryTtl() 方法中有一个判断：

Assert.notNull(ttl, "TTL duration must not be null!"); 

下面给出一个正确用法：

@Bean
    public CacheManager redisCacheManager(RedisConnectionFactory redisConnectionFactory) {
        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofSeconds(3600));
        return RedisCacheManager.builder(RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))
                .cacheDefaults(redisCacheConfiguration).build();
    }

最终完美解决！

： » redisCacheManager nested exception is java.lang.IllegalArgumentException: TTL duration must not be null!