java - PropertyNotFoundException : Could not find a getter for lastMoveDate in class com. hib.objects.GameBoard

Question

我用驼峰式命名了类变量。这就是类，这似乎是罪魁祸首。

import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import java.sql.Date;

public class GameBoard
{
    @Temporal(TemporalType.DATE)
    private Date lastMoveDate;

    /**
     * @return the lastMoveDate
     */
    public Date getLastMoveDate() {
        return lastMoveDate;
    }

    /**
     * @param lastMoveDate the lastMoveDate to set
     */
    public void setLastMoveDate(Date lastMoveDate) {
        this.lastMoveDate = lastMoveDate;
    }

}

该类还有几个其他变量，例如 playerOneFk、playerTwoFk 和 gameLobbyFk(hibernate 能够跟踪每个 setter-getter 在这些变量上，但在 last_move_date 列中抛出异常。

我还尝试了方法名称 setlastMoveDate 和 getlastMoveDate(没有运气..)，lastMoveDate 的属性../p>

<property name="lastMoveDate" type="date" column="last_move_date" />

以及捕获的异常

SEVERE: Servlet.service() for servlet [authapi] in context with path [/TTTserver] threw exception [Servlet execution threw an exception] with root cause
org.hibernate.PropertyNotFoundException: Could not find a getter for lastMoveDate in class com.hib.objects.GameBoard
    at org.hibernate.property.BasicPropertyAccessor.createGetter(BasicPropertyAccessor.java:282)
    at org.hibernate.property.BasicPropertyAccessor.getGetter(BasicPropertyAccessor.java:275)
    at org.hibernate.mapping.Property.getGetter(Property.java:272)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.buildPropertyGetter(PojoEntityTuplizer.java:247)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:125)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:55)
    at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:56)
    at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:295)
    at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:434)
    at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:109)
    at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
    at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:226)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294)
    at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)
    at com.hib.objects.HibernateUtil.<clinit>(HibernateUtil.java:24)
    at nz.ac.massey.cs.capstone.auth.authapi.processRequest(authapi.java:42)
    at nz.ac.massey.cs.capstone.auth.authapi.doGet(authapi.java:74)

Answer 1

在 Hibernate 中，属性类型“date”映射到 java.sql.Date。

如果您使用的是 java.util.Date，您将希望您的属性类型为“timestamp”。

像现在这样使用“date”会导致它寻找在 java.sql.Date 上运行的 getter/setter，但它无法找到它。

参见 Hibernate basic type reference (6.1.1.12 和 6.1.1.14)。

编辑:解决一些命名约定问题:

Hibernate 遵循标准的 bean 命名约定:

• 字段:一些字段
• 属性:someField(同字段名)
• Getter:getSomeField() 或 isSomeField()(如果它是 boolean 值)
• 二传手:setSomeField()