There are two ways to customize the underlying javax.cache.cacheManager:

• Caches can be created on startup by setting the spring.cache.cache-names property. If a custom javax.cache.configuration.Configuration bean is defined, it is used to customize them.
• org.springframework.boot.autoconfigure.cache.JCacheManagerCustomizer beans are invoked with the reference of the CacheManager for full customization.

java
//JCacheCacheConfiguration

  @Bean
    @ConditionalOnMissingBean
    CacheManager jCacheCacheManager(CacheProperties cacheProperties,
            ObjectProvider<javax.cache.configuration.Configuration<?, ?>> defaultCacheConfiguration,
            ObjectProvider<JCacheManagerCustomizer> cacheManagerCustomizers,
            ObjectProvider<JCachePropertiesCustomizer> cachePropertiesCustomizers) throws IOException {
        CacheManager jCacheCacheManager = createCacheManager(cacheProperties, cachePropertiesCustomizers);
        List<String> cacheNames = cacheProperties.getCacheNames();
        if (!CollectionUtils.isEmpty(cacheNames)) {
            for (String cacheName : cacheNames) {
                jCacheCacheManager.createCache(cacheName,
                        defaultCacheConfiguration.getIfAvailable(MutableConfiguration::new));
            }
        }
        cacheManagerCustomizers.orderedStream().forEach((customizer) -> customizer.customize(jCacheCacheManager));
        return jCacheCacheManager;
    }

// RedisCacheConfiguration

将Spring配置的CacheManager提供给Hihernate

java
@Bean
public HibernatePropertiesCustomizer hibernatePropertiesCustomizer(javax.cache.CacheManager cm) {
    return hibernateProperties -> hibernateProperties.put(ConfigSettings.CACHE_MANAGER, cm);
}

Hibernate创建的CacheManager的时候会去取

java
org.hibernate.cache.jcache.internal.JCacheRegionFactory

protected CacheManager resolveCacheManager(SessionFactoryOptions settings, Map properties) {
    final Object explicitCacheManager = properties.get( ConfigSettings.CACHE_MANAGER );
        if ( explicitCacheManager != null ) {
            return useExplicitCacheManager( settings, explicitCacheManager );       
    }

    ......  

}

但是hibernate的cache必须提前让Spring这边创建好，否则由JcacheRegionFactory这边创建的话会报错

java
// JCacheRegionFactory
cacheManager.createCache( regionName, new MutableConfiguration<>() );

// org.redisson.jcache.JCacheManager
createCache() {
        if (cacheRedisson == null && !(configuration instanceof RedissonConfiguration)) {            
                throw new IllegalStateException("Default configuration hasn't been specified!"); 
        }
}