Spring，Java：错误，无法将java.lang.Long强制转换为java.util.Date

Question

当我启动服务器时，出现错误，我无法将Long转换为Date。它被扔在特定的行。

错误日志：

java.lang.ClassCastException: java.lang.Long cannot be cast to java.util.Date
    at org.hibernate.type.descriptor.java.JdbcTimestampTypeDescriptor.unwrap(JdbcTimestampTypeDescriptor.java:41)
    at org.hibernate.type.descriptor.sql.TimestampTypeDescriptor$1.doBind(TimestampTypeDescriptor.java:64)
    at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:90)
    at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:286)
    at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:281)
    at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:67)
    at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:616)
    at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1901)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1862)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1839)
    at org.hibernate.loader.Loader.doQuery(Loader.java:910)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)
    at org.hibernate.loader.Loader.doList(Loader.java:2554)
    at org.hibernate.loader.Loader.doList(Loader.java:2540)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2370)
    at org.hibernate.loader.Loader.list(Loader.java:2365)
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)
    at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1300)
    at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
    at com.journaldev.spring.dao.SupportRequestDAOImpl.getUnResolvedIssuesWithTimerExpired(SupportRequestDAOImpl.java:211)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    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)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

SupportRequestDAOImpl：

 @Override
    public List<SupportRequest> getUnResolvedIssuesWithTimerExpired() {
        Session session = this.sessionFactory.getCurrentSession();
        long now = System.currentTimeMillis();
        Query query = session.createQuery("from SupportRequest as sr where sr.resolved=false and sr.timeToResolve>:now and sr.requestStatus=false");
        query.setParameter("now", now); // error line
        return query.list();
    }

SupportRequest模型：

@Entity
@Table(name = "supportrequest")
public class SupportRequest implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "supportrequestid")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "supportrequest_gen")
    @SequenceGenerator(name = "supportrequest_gen", sequenceName = "supportrequest_seq")
    private int supportRequestId;

    @Column(name = "subject")
    private String subject;

    @Column(name = "text")
    private String text;

    @Column(name = "type")
    private String type;

    @Column(name = "priority")
    private String priority;

    @Column(name = "status",columnDefinition = "boolean default false")
    private boolean requestStatus;

    @Column(name = "timetoresolve")
    private Timestamp timeToResolve;

    @Column(name = "creationtime")
    private Timestamp creationTime;

    @Column(name = "resolvedtime")
    private Timestamp resolvedTime;

    @Column(name = "assigned_team_member_id")
    private int assignedTeamMemberId;

    @Column(name = "resolved",columnDefinition = "boolean default false")
    private boolean resolved;

    @Column(name = "resolvedintime",columnDefinition = "boolean default false")
    private boolean resolvedInTime;

    // Only for testing
    @Transient
    private int assignedteamid;

    @Transient
    private Long assignedgroupid;

SupportRequest数据库表：

CREATE TABLE supportrequest
(
  supportrequestid integer NOT NULL,
  subject character varying,
  text character varying,
  type character varying,
  priority character varying,
  timetoresolve timestamp without time zone,
  creationtime timestamp without time zone,
  resolvedtime timestamp without time zone,
  assigned_team_member_id integer DEFAULT 0,
  resolved boolean DEFAULT false,
  resolvedintime boolean DEFAULT false,
  groupid numeric NOT NULL,
  status boolean,
  CONSTRAINT supportrequestid PRIMARY KEY (supportrequestid),
  CONSTRAINT groupaccount_supportrequest_fk FOREIGN KEY (groupid)
      REFERENCES groupaccount (groupid) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION
)
WITH (
  OIDS=FALSE
);
ALTER TABLE supportrequest
  OWNER TO postgres;

我究竟做错了什么？

我也尝试过：

long now = new Timestamp(System.currentTimeMillis()).getTime();

Answer 1

问题是您正在long为应该为的字段设置一个值Date。将您的代码更改为：

query.setParameter("now", new Date());

在HQL查询中，您具有以下条件sr.timeToResolve > :now。由于timeToResolve被声明为Timestampin SupportRequest，Hibernate期望比较的另一面也为in Date。