我正在使用休眠来处理数据库事务。我是休眠的新手。
我要实体：
AttributeEntity
分类实体
AttributeEntity可以具有一个或多个taxonomyEntities。
AttributeEntity约束：
attributeId是主键
attributeCd是唯一的
分类实体约束：
taxonomyId是主键
attributeCd是表“ Attribute”的外键
我想做什么？
创建这两个实体之间的关系，以便我可以创建/删除整个树结构（属性及其分类法）。像attributeEntity.save（）或attributeEntity.delete（）
问题：
使用以下测试，当我尝试保存attributeEntity时，hibernate将保存数据。但是，当使用taxonomyEntity列表作为AttributeEntity的一部分时，我看到了下面描述的错误。我可以对错误原因有任何见解吗？
我的AttributeEntity类：
package com.myplace.online.attribute.api.entities;
import java.io.Serializable;
import java.sql.Time;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.persistence.*;
@Entity
@SequenceGenerator( name = "attribute_seq", sequenceName = "OAP_META_NEW.ATTRIBUTE_SEQ" )
@Table(name = "ATTRIBUTE", schema = "OAP_META_NEW")
public class AttributeEntity implements Serializable
{
private int attributeId;
private Integer attributeCategoryId;
private String attributeName;
private String attributeCd;
private List<TaxonomyEntity> taxonomyEntities;
@Id
@Column(name = "ATTRIBUTE_ID", nullable = false, unique = true)
@GeneratedValue( strategy = GenerationType.AUTO, generator = "attribute_seq" )
public int getAttributeId()
{
return attributeId;
}
public void setAttributeId( int attributeId )
{
this.attributeId = attributeId;
}
@Basic
@Column(name = "ATTRIBUTE_CATEGORY_ID", nullable = false, precision = 0)
@JoinColumn(name = "ATTRIBUTE_CATEGORY_ID", referencedColumnName = "ATTRIBUTE_CATEGORY_ID")
public Integer getAttributeCategoryId()
{
return attributeCategoryId;
}
public void setAttributeCategoryId( Integer attributeCategoryId )
{
this.attributeCategoryId = attributeCategoryId;
}
@Basic
@Column(name = "ATTRIBUTE_NAME", nullable = false, length = 70)
public String getAttributeName()
{
return attributeName;
}
public void setAttributeName( String attributeName )
{
this.attributeName = attributeName;
}
@Basic
@Column(name = "ATTRIBUTE_CD", nullable = false, length = 6)
public String getAttributeCd()
{
return attributeCd;
}
public void setAttributeCd( String attributeCd )
{
this.attributeCd = attributeCd;
}
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
@JoinColumn( name = "ATTRIBUTE_CD", referencedColumnName = "ATTRIBUTE_CD", nullable = false )
public List<TaxonomyEntity> getTaxonomyEntities()
{
return taxonomyEntities;
}
public void setTaxonomyEntities(List<TaxonomyEntity> taxonomyEntities)
{
this.taxonomyEntities = taxonomyEntities;
}
}
我的TaxonomyEntity类
package com.myplace.online.attribute.api.entities;
import java.io.Serializable;
import java.util.List;
import javax.persistence.*;
@Entity
@SequenceGenerator( name = "taxonomy_seq", sequenceName = "OAP_META_NEW.TAXONOMY_SEQ" )
@Table(name = "TAXONOMY", schema = "OAP_META_NEW")
public class TaxonomyEntity implements Serializable
{
private int taxonomyId;
private String attributeCd;
private String taxonomyCategory;
private String taxonomySubcategory;
private String taxonomyAttributeName;
@Id
@Column(name = "TAXONOMY_ID", nullable = false, unique = true)
@GeneratedValue( strategy = GenerationType.AUTO, generator = "taxonomy_seq" )
public int getTaxonomyId()
{
return taxonomyId;
}
public void setTaxonomyId( int taxonomyId )
{
this.taxonomyId = taxonomyId;
}
@Basic
@Column(name = "ATTRIBUTE_CD", length = 6, nullable = false, insertable = false ,updatable = false)
public String getAttributeCd()
{
return attributeCd;
}
public void setAttributeCd( String attributeCd )
{
this.attributeCd = attributeCd;
}
@Basic
@Column(name = "TAXONOMY_CATEGORY", nullable = true, length = 100)
public String getTaxonomyCategory()
{
return taxonomyCategory;
}
public void setTaxonomyCategory( String taxonomyCategory )
{
this.taxonomyCategory = taxonomyCategory;
}
@Basic
@Column(name = "TAXONOMY_SUBCATEGORY", nullable = true, length = 100)
public String getTaxonomySubcategory()
{
return taxonomySubcategory;
}
public void setTaxonomySubcategory( String taxonomySubcategory )
{
this.taxonomySubcategory = taxonomySubcategory;
}
@Basic
@Column(name = "TAXONOMY_ATTRIBUTE_NAME", nullable = false, length = 100)
public String getTaxonomyAttributeName()
{
return taxonomyAttributeName;
}
public void setTaxonomyAttributeName( String taxonomyAttributeName )
{
this.taxonomyAttributeName = taxonomyAttributeName;
}
}
这是我尝试测试的方式：
//create attribute
attributeEntity = new AttributeEntity();
attributeEntity.setAttributeCategoryId(0);
attributeEntity.setAttributeCd("E_TEST");
attributeEntity.setAttributeId(0);
attributeEntity.setAttributeName("TEST_ATTRIBUTE");
//Create Taxomony
taxonomyEntity = new TaxonomyEntity();
// taxonomyEntity.setTaxonomyId(0); -- expecting this to be created by the sequence
taxonomyEntity.setDescription("A test taxonomy");
taxonomyEntity.setTaxonomyCategory("123123123CategoryTest");
taxonomyEntity.setTaxonomySubcategory("123123123SubcategoryTest");
// taxonomyEntity.setAttributeCd(attributeEntity.getAttributeCd()); -- Expecting this to be created from AttributeEntity
taxonomyEntity.setTaxonomyAttributeName("TEST_TAXONOMY_ATTRIBUTE");
List<TaxonomyEntity> taxonomyList = new ArrayList<TaxonomyEntity>();
taxonomyList.add(taxonomyEntity);
attributeEntity.setTaxonomyEntities(taxonomyList);
attributeService = context.getBean( AttributeService.class );
attributeService.saveAttributeEntity(attributeEntity);
这是我看到的错误：
发生IllegalArgumentException呼叫com.myplace.online.attribute.api.entities.AttributeEntity.attributeCd的getter
然后到最后：原因：java.lang.IllegalArgumentException：对象不是声明类的实例
org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.myplace.online.attribute.api.entities.AttributeEntity.attributeCd
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:192)
at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:76)
at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValues(AbstractComponentTuplizer.java:82)
at org.hibernate.tuple.component.PojoComponentTuplizer.getPropertyValues(PojoComponentTuplizer.java:107)
at org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:433)
at org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:421)
at org.hibernate.event.internal.WrapVisitor.processComponent(WrapVisitor.java:135)
at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:127)
at org.hibernate.event.internal.WrapVisitor.processValue(WrapVisitor.java:125)
at org.hibernate.event.internal.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:76)
at org.hibernate.event.internal.AbstractSaveEventListener.visitCollectionsBeforeSave(AbstractSaveEventListener.java:372)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:273)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:137)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:114)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:684)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:676)
at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:235)
at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)
at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:379)
at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:319)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:296)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118)
at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:460)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:294)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:137)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:715)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:707)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:702)
at com.myplace.online.attribute.api.dao.GenericDAOImpl.save(GenericDAOImpl.java:85)
at com.myplace.online.attribute.api.services.AttributeServiceImpl.saveAttributeEntity(AttributeServiceImpl.java:41)
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:302)
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$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
at com.sun.proxy.$Proxy39.saveAttributeEntity(Unknown Source)
at com.myplace.online.attribute.api.TaxonomyTest.setUpEntity(TaxonomyTest.java:97)
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.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)
at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1198)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1123)
at org.testng.TestNG.run(TestNG.java:1031)
at org.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:72)
at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:124)
**Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class**
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.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:169)
提前致谢。
最佳答案
这是在Hibernate中定义OneToMany的一种方法
@OneToMany(mappedBy="entitie")
@OrderBy("theFieldYouWantOrder ASC")
列表可以通过两种不同的方式进行映射：
作为有序列表，其中该订单未在数据库中实现
作为索引列表，在数据库中实现订单
要对内存中的列表进行排序，请将@ javax.persistence.OrderBy添加到您的
属性。该注释将逗号分隔的列表作为参数
（目标实体的）属性并命令集合
相应地（例如，名字asc，age desc），如果字符串为空，则
收集将按目标实体的主键排序。
The documentation of Hibernate查看7.2.2节以获取完整的文档。我认为您正在尝试像ManyToOne而不是OneToMany映射错误