Java 查询级别2缓存引发ClassCastException

我正在为数据库使用JPA和Hibernate。我已经配置了（EHCacache）二级缓存和查询级缓存，但为了确保缓存正常工作，我正在尝试获取引发类强制转换异常的统计信息。任何帮助都将不胜感激。我的主要目标是查看所有已缓存的对象，以确保缓存正常工作

代码如下：

public List<CodeValue> findByCodetype(String propertyName) {

    try {
        final String queryString = "select model from CodeValue model where model.codetype"
                + "= :propertyValue" + " order by model.code";

        Query query = em.createQuery(queryString);
        query.setHint("org.hibernate.cacheable", true);
        query.setHint("org.hibernate.cacheRegion", "query.findByCodetype");
        query.setParameter("propertyValue", propertyName);
        List resultList = query.getResultList();

        org.hibernate.Session session = (Session) em.getDelegate();
        SessionFactory sessionFactory = session.getSessionFactory();
        Map cacheEntries = sessionFactory.getStatistics()
                .getSecondLevelCacheStatistics("query.findByCodetype")
                .getEntries();
        logger.info("The statistics are: " + cacheEntries);
        return resultList;

    } catch (RuntimeException re) {
        logger.error("findByCodetype failed in trauma patient", re);
        throw re;
    }

}

---

您知道发生了什么吗？

当您对实体和查询使用相同的二级缓存区域时，Hibernate会变得很麻烦。通常情况下，这并不重要，它可以正常工作，但是某些操作（比如这个）会触发bug。Hibernate开发人员似乎不想修复它

确保您的应用程序已访问实体缓存

请参阅以进行讨论

[6/7/10 19:23:17:059 GMT] 00000034 SystemOut     O java.lang.ClassCastException: org.hibernate.cache.QueryKey incompatible with org.hibernate.cache.CacheKey
    at org.hibernate.stat.SecondLevelCacheStatistics.getEntries(SecondLevelCacheStatistics.java:51)
    at com.idph.trauma.registry.service.TraumaPatientDAO.findByCodetype(TraumaPatientDAO.java:439)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:615)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at $Proxy209.findByCodetype(Unknown Source)