Question

我无法从对象变量类型转换为类类型变量。出现以下错误：

*Hibernate: select osinfo0_.host_id as host_id1_17_0_, osinfo0_.os_build as os_build2_17_0_, osinfo0_.os_name as os_name3_17_0_, osinfo0_.os_type as os_type4_17_0_, osinfo0_.os_version as os_versi5_17_0_ from hwi.os_info osinfo0_ where osinfo0_.host_id=?
Jun 15, 2015 10:28:20 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [spring] in context with path [/HardwareInventory] threw exception [Request processing failed; nested exception is java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.vmware.hwi.model.StorageInfo] with root cause
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.vmware.hwi.model.StorageInfo
    at com.vmware.hwi.dao.impl.StorageInfoDaoImpl.getStorageInfoFullListByTeam(StorageInfoDaoImpl.java:76)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)*

我是Hibernate Query编写的新手，所以我怀疑编写查询时可能会有一些错误，但我可以看到查询返回的值完全正常，不知道我在这里缺少的地方。

以下是代码的一部分：

@Override
public StorageInfo getStorageInfoFullListByTeam(Integer storageTeam){
    StorageInfo storageFullList = null;
    Session session = sessionFactory.getCurrentSession();
    /*Query query = session.createQuery(
            "from Host host, StorageInfo storage ServerStorage" +
            " server where storage.storageId=server.storageId" +
            " AND server.hostId=host.hostId AND storage.storageTeam= ' "
            + storageTeam+ " ' ");*/
    Query query = session.createQuery(
            "from Host host, StorageInfo storage , ServerStorage" +
            " server where storage.storageId=server.storageId" +
            " AND server.hostId=host.hostId AND storage.storageTeam= ' "
            + storageTeam + " ' ");
    List info = query.list();
    if(info.size() !=0){
        storageFullList = (StorageInfo) info.get(0);
    }
    return storageFullList;
}

Answer 1

从您的查询中看起来您正在获取Host，StorageInfo，ServerStorage，并且在获取Object（StorageInfo）info.get（0）时，您尝试将其转换为StorageInfo。因此，尝试从查询中删除Host和Serverstorage，否则如果要从3个表中获取记录，请创建一个java pojo类，它表示您在查询中获取的列类型并映射您的pojo类（尝试搜索映射pojo到hibernate查询结果）。

无法从一个对象转换为类：

1 个答案: