Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]的问题解决方案

最新推荐文章于 2020-08-10 16:25:07 发布

原创最新推荐文章于 2020-08-10 16:25:07 发布 · 689 阅读

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#Hibernate #封装 #配置 #映射文件

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本文解决了一个关于Hibernate在实体类属性映射时遇到的问题，详细分析了Hibernate如何寻找getter和setter方法的过程，并提供了正确的属性命名规范。

Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
	at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:108)
	at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:133)
	at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:80)
	at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:322)
	at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:473)
	at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:133)
	at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
	at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:284)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1842)
	at common.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:20)
	... 2 more
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:105)
	... 11 more
Caused by: org.hibernate.PropertyNotFoundException: Could not find a getter for isadmin in class po.User
	at org.hibernate.property.BasicPropertyAccessor.createGetter(BasicPropertyAccessor.java:326)
	at org.hibernate.property.BasicPropertyAccessor.getGetter(BasicPropertyAccessor.java:320)
	at org.hibernate.mapping.Property.getGetter(Property.java:304)
	at org.hibernate.tuple.entity.PojoEntityTuplizer.buildPropertyGetter(PojoEntityTuplizer.java:297)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:155)
	at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:77)
	... 16 more

出现错误的原因就是：

在我配置文件中的

        <property name="isadmin" type="java.lang.String">
            <column name="ISADMIN" length="2" />
        </property>isadmin" type="java.lang.String">
            <column name="ISADMIN" length="2" />
        </property>

和我的持久化类中的属性名没有匹配上，实体类中如下：

private String isAdmin;
	public String getIsAdmin() {
		return isAdmin;
	}
	public void setIsAdmin(String isAdmin) {
		this.isAdmin = isAdmin;
	}isAdmin;
	public String getIsAdmin() {
		return isAdmin;
	}
	public void setIsAdmin(String isAdmin) {
		this.isAdmin = isAdmin;
	}

这个原因是为什么呢？

Hibernate去读写这个属性的时候，它会去找的是set方法。就是说isadmin，会先去找这个setIsAdmin()，因为根据封装的规则嘛。

那么我现在把代码改为如下的形式：

private String isAdmin;
	public String getIsadmin() {
		return isAdmin;
	}
	public void setIsadmin(String isAdmin) {
		this.isAdmin = isAdmin;
	}isAdmin;
	public String getIsadmin() {
		return isAdmin;
	}
	public void setIsadmin(String isAdmin) {
		this.isAdmin = isAdmin;
	}

也没有报出上面的错误。