PropertyNotFoundException：在类com.hib.objects.GameBoard中找不到lastMoveDate的getter

问题描述

我已经用 camel casing 命名了类变量，这个类似乎是罪魁祸首。

  import javax.persistence.Temporal; 
 import javax.persistence.TemporalType; 
 import java.sql.Date; 
 
 public class GameBoard 
 {
 @Temporal（TemporalType.DATE）
 private date lastMoveDate; 
 $ b $ ** 
 * @return lastMoveDate 
 * / 
 public Date getLastMoveDate（）{
 return lastMoveDate; 
 
 $ b $ ** 
 * @param lastMoveDate lastMoveDate设置
 * / 
 public void setLastMoveDate（Date lastMoveDate）{
 this.lastMoveDate = lastMoveDate; 
} 
 
} 
  

该类还有其他几个变量作为 playerOneFk ， playerTwoFk 和 gameLobbyFk （hibernate能够追踪这些变量上的每一个 setter-getter ，但是会抛出异常< last_move_date 列）。

我也尝试过方法名称 setlastMoveDate 和 getlastMoveDate ） lastMoveDate

 < property name =lastMoveDatetype =datecolumn =last_move_date/> 
  

并且发现异常

  SEVERE：Servlet.service（）用于上下文中的servlet [authapi] [/ TTTserver]抛出异常[Servlet执行抛出异常]，其根源为
 org.hibernate.PropertyNotFoundException：可能在类com.hib.objects.GameBoard中找不到getter for lastMoveDate 
在org.hibernate.property.BasicPropertyAccessor.createGetter（BasicPropertyAccessor.java:282）
在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）
在org.hibernate.tuple.entity.EntityEntityM < 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.au thapi.doGet（authapi.java:74）
  

解决方案

Hibernate，属性类型date映射到java.sql.Date。

如果您使用的是java.util.Date，则需要将属性类型设置为是时间戳。

现在使用date会导致它寻找一个在java.sql.Date上运行的getter / setter，它将无法找到它。

请参阅（6.1.1.12和6.1.1.14）。

编辑：解决一些命名约定的问题：

Hibernate遵循标准的bean命名约定：

• 字段：someField


• 属性：someField（与字段名相同）
  
• getter：getSomeField（）或isSomeField（） （如果它是布尔型的）


• setter：setSomeField（）

I've named the class variable with camel casing.This is the class, which seems to be the culprit.

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;
    }

}

The class has several other variables such as playerOneFk, playerTwoFk and gameLobbyFk (hibernate is able to track each setter-getter on these variables, but is throwing exceptions with the last_move_date column).

I've also tried the method names setlastMoveDate and getlastMoveDate (with no luck..), The properties.. for lastMoveDate

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

And the caught exception

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)

解决方案

In Hibernate, the property type "date" maps to a java.sql.Date.

If you are using a java.util.Date, you will want your property type to be "timestamp".

Using "date" as you are now will cause it to look for a getter/setter that operates on a java.sql.Date, and it won't be able to find it.

See Hibernate basic type reference (6.1.1.12 and 6.1.1.14).

Edit: Addressing some naming convention concerns:

Hibernate obeys standard bean naming conventions:

• Field: someField
• Property: someField (same as field name)
• Getter: getSomeField() or isSomeField() (if it is a boolean)
• Setter: setSomeField()

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