我在 Spring Boot 中配置緩存時遇到問題。它工作正常，經過一些無關的更改后，它停止工作。我有以下緩存配置：@Configurationpublic class UserMappingCacheConfig {    public static final String USER_MAPPING_CACHE = "userMappingCache";@Bean(name = "userMappingCache")public Cache<String, String> getUserMappingCache(JCacheCacheManager cacheManager) {    CacheManager cm = cacheManager.getCacheManager();    Cache<String, String> cache = cm.getCache(USER_MAPPING_CACHE, String.class, String.class);    if (cache == null)        cache = cm.createCache(USER_MAPPING_CACHE, getUserMappingCacheConfiguration());    return cache;}private MutableConfiguration<String, String> getUserMappingCacheConfiguration() {    MutableConfiguration<String, String> configuration =            new MutableConfiguration<String, String>()                    .setStoreByValue(true)                    .setExpiryPolicyFactory( FactoryBuilder.factoryOf(                            new CreatedExpiryPolicy( Duration.ONE_DAY)                    ));    return configuration;}我按以下方式使用緩存：@CacheResult(cacheName = "userMappingCache")public String getPayrollUserName(@CacheKey String userName, String description) {...}但是，運行服務時出現以下異常：org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMappingCache' defined in class path resource [UserMappingCacheConfig.class]: Bean instantiation via factory method failed;nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.cache.Cache]: Factory method 'getUserMappingCache' threw exception; nested exception is java.lang.ClassCastException: Incompatible cache key types specified, expected class java.lang.Object but class java.lang.String was specified                at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE]    ....我搜索了一下，發現了一些條目，這些條目主要與鍵/值的序列化類似的問題有關。即使是原始類也是這個原因嗎？我該如何解決？提前致謝。