public String getCacheConfig() {
        return cacheConfig;
    }
Shuts-down the wrapped JCache CacheManager <b>only if implicitly created</b>.
<p/>
If another component injected
a non-null CacheManager into this instance before calling {@link #init() init}, this instance expects that same
component to also destroy the CacheManager instance, and it will not attempt to do so.
support/jcache/src/main/java/org/apache/shiro/cache/jcache/JCacheManager.java