JCache密钥异常

Question

我有一个必须缓存的方法。我有一个带有JSR-107 (JCache)缓存的SpringBoot 2.1.7应用程序。使用的缓存实现: EHCache 3.8.0。

@Override
@HystrixCommand(fallbackMethod = "fallbackGetAllUserProfiles")
@Timed(histogram = true, percentiles = {0.75, 0.9, 0.95, 0.99})
@CacheResult
public UserProfiles getAllUserProfiles(@CacheKey String accountID, @CacheKey String userID) {
    return getAllUserProfilesFromBackend(accountID, userID);
}

当我在我的SpringBoot starter类上使用注释：@EnableCaching时，这个类是用CacheDefaults(cacheName = "profileCache")注释的，当我试图访问这个方法时，我得到了这个异常：

java.lang.ClassCastException: Invalid key type, expected : java.lang.String but was : org.springframework.cache.interceptor.SimpleKey
    at org.ehcache.impl.store.BaseStore.checkKey(BaseStore.java:64) ~[ehcache-3.8.0.jar:3.8.0 98c7461621c490ef009548e61849f925305a631f]
    at org.ehcache.impl.internal.store.heap.OnHeapStore.get(OnHeapStore.java:279) ~[ehcache-3.8.0.jar:3.8.0 98c7461621c490ef009548e61849f925305a631f]
    at org.ehcache.core.Ehcache.doGet(Ehcache.java:90) ~[ehcache-3.8.0.jar:3.8.0 98c7461621c490ef009548e61849f925305a631f]
    at org.ehcache.core.EhcacheBase.get(EhcacheBase.java:127) ~[ehcache-3.8.0.jar:3.8.0 98c7461621c490ef009548e61849f925305a631f]
    at org.ehcache.jsr107.Eh107Cache.get(Eh107Cache.java:90) ~[ehcache-3.8.0.jar:3.8.0 98c7461621c490ef009548e61849f925305a631f]
    at org.springframework.cache.jcache.JCacheCache.lookup(JCacheCache.java:77) ~[spring-context-support-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.cache.support.AbstractValueAdaptingCache.get(AbstractValueAdaptingCache.java:58) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.cache.interceptor.AbstractCacheInvoker.doGet(AbstractCacheInvoker.java:73) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.cache.jcache.interceptor.CacheResultInterceptor.invoke(CacheResultInterceptor.java:57) ~[spring-context-support-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.cache.jcache.interceptor.JCacheAspectSupport.execute(JCacheAspectSupport.java:135) ~[spring-context-support-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.cache.jcache.interceptor.JCacheAspectSupport.execute(JCacheAspectSupport.java:112) ~[spring-context-support-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.cache.jcache.interceptor.JCacheInterceptor.invoke(JCacheInterceptor.java:82) ~[spring-context-support-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93) ~[spring-aop-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688) ~[spring-aop-5.1.9.RELEASE.jar:5.1.9.RELEASE]

缓存规格如下：

    <cache alias="profileCache">
        <key-type copier="org.ehcache.impl.copy.SerializingCopier">java.lang.String</key-type>
        <value-type copier="org.ehcache.impl.copy.IdentityCopier">java.util.List</value-type>
        <expiry>
            <ttl unit="minutes">5</ttl>
        </expiry>
        <heap unit="entries">10000</heap>
    </cache>

当我将注释更改为@EnableCaching(mode = AdviceMode.ASPECTJ)时，它确实起作用了。这是一个bug，还是我做错了什么？

Answer 1

如果在没有任何参数的方法上进行缓存，但没有指定键，则会发生此错误。我通过添加一个键解决了这个错误：

@Cacheable(value = "SomeCacheName", key = "#root.methodName")
public List<Country> getCountries() {
    ...
    return countries;
}