ClassCastException in case of configured read-through cache with some cache loader

1). Configure cache in invalidation mode in XML: <?xml version= "1.0" encoding= "UTF-8" ?> <infinispan xmlns= "urn:infinispan:config:8.2" > <cache-container default-cache= "default" > <transport cluster= "jcache-cluster" /> <invalidation-cache-configuration name= "user" mode= "SYNC" statistics= "true" /> </cache-container> </infinispan> 2). Provide cache loader configuration through JCache API: new MutableConfiguration< String , User>() .setReadThrough( true ).setStoreByValue( true ) .setCacheLoaderFactory(FactoryBuilder.factoryOf(UserCacheLoader.class)); Cache loader can be trivial: public class UserCacheLoader implements CacheLoader< String , User> { @Override public User load( String username) { return new User(username); } } 3). Load serveral users into the cache. 4). Call `javax.cache.Cache.removeAll()` method on the cache instance.