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我需要从 MainEntity 的包中删除 SubEntity。
此子实体与其他实体有其他关系。
模型看起来像:
主要实体:
@Data
@EqualsAndHashCode(of = "idNum")
@Entity
@Table(name = "MAIN_TABLE")
public class MainEntity implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "idNum")
@SequenceGenerator(name = "idNum", sequenceName = "id_num", allocationSize = 1)
@Column(name="ID_NUM")
private Long idNum;
@OneToMany(mappedBy = "mainEntity", cascade = CascadeType.ALL, orphanRemoval = true)
private List<SubEntity> subEntities = new ArrayList<>();
public void addSubEntity(SubEntity subEntity) {
subEntity.setMainEntity(this);
subEntities.add(subEntity);
}
public void removeSubEntity(SubEntity subEntity) {
subEntity.setMainEntity(null);
subEntities.remove(subEntity);
}
}
子实体:
@Data
@EqualsAndHashCode(of = "subIdNum")
@ToString(exclude = "mainEntity")
@Entity
@Table(name = "SUB_TABLE")
public class SubEntity implements Serializable {
@Id
@Column(name = "SUB_ID")
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "subIdNumSequence")
@SequenceGenerator(name = "subIdNumSequence", sequenceName = "SEQ_SUB_ID", allocationSize = 1)
private Long subIdNum;
@Column(name = "IND_NUM")
private String indNum;
@Column(name = "FAMILY_IDENTIFIER")
private String familyIdentifier;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "ID_NUM")
private MainEntity mainEntity;
@OneToMany(mappedBy = "subEntity", cascade = CascadeType.ALL, orphanRemoval = true)
private List<SubSubEntity> subSubEntities = new ArrayList<>();
@OneToMany(mappedBy = "subEntity", cascade = CascadeType.ALL, orphanRemoval = true)
private List<AnotherSubSubEntity> anotherSubSubEntities = new ArrayList<>();
}
子子实体:
@Entity
@Data
@ToString(exclude = "subEntity")
@EqualsAndHashCode(of = {"idNum", "code", "indNum" })
@Table(name = "SUB_SUB_TABLE")
@IdClass(SubSubEntity.SubSubEntityId.class)
public class SubSubEntity implements Serializable {
@Getter
@Id
@Column(name = "ID_NUM", insertable = false, updatable = false)
private Long idNum;
@Id
@Column(name = "CODE")
private String code;
@Getter
@Id
@Column(name = "IND_NUM", insertable = false, updatable = false)
private String indNum;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({
@JoinColumn(name = "ID_NUM", referencedColumnName = "ID_NUM"),
@JoinColumn(name = "IND_NUM", referencedColumnName = "IND_NUM")
})
@Id
private SubEntity subEntity;
public void setSubEntity(SubEntity subEntity) {
idNum = Optional.ofNullable(subEntity).map(SubEntity::getMainEntity).map(MainEntity::getIdNum).orElse(null);
code = Optional.ofNullable(subEntity).map(SubEntity::getIndNum).orElse(null);
this.subEntity = subEntity;
}
@Data
@AllArgsConstructor
@NoArgsConstructor
public static class SubSubEntityId implements Serializable {
private Long idNum;
private String code;
private String indNum;
}
}
另一个子子实体:
@Entity
@Data
@ToString(exclude = "subEntity")
@EqualsAndHashCode(of = {"idNum", "person", "sourceCode"})
@Table(name = "ANOTHER_SUB_SUB_TABLE")
@IdClass(AnotherSubSubEntity.AnotherSubSubEntityId.class)
public class AnotherSubSubEntity implements Serializable {
@Getter
@Id
@Column(name = "ID_NUM", insertable = false, updatable = false)
private Long idNum;
@Getter
@Id
@Column(name = "PERSON", insertable = false, updatable = false)
private String person;
@Id
@Column(name = "SOURCE_CODE")
private String sourceCode;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({
@JoinColumn(name = "ID_NUM", referencedColumnName = "ID_NUM", insertable = false, updatable = false),
@JoinColumn(name = "PERSON", referencedColumnName = "FAMILY_IDENTIFIER", insertable = false, updatable = false)
})
@Id
private SubEntity subEntity;
public void setSubEntity(SubEntity subEntity) {
idNum = Optional.ofNullable(subEntity).map(SubEntity::getMainEntity).map(MainEntity::getIdNum).orElse(null);
person = Optional.ofNullable(subEntity).map(SubEntity::getFamilyIdentifier).orElse(null);
this.subEntity = subEntity;
}
@Data
@AllArgsConstructor
@NoArgsConstructor
public static class AnotherSubSubEntityId implements Serializable {
private Long idNum;
private String person;
private String sourceCode;
}
}
此测试的架构和数据是(我正在运行嵌入式 hsql 数据库):
SET DATABASE SQL SYNTAX ORA TRUE;
CREATE TABLE MAIN_TABLE(
"ID_NUM" NUMBER,
CONSTRAINT "PK_MAIN_TABLE" PRIMARY KEY ("ID_NUM")
);
CREATE SEQUENCE SEQ_SUB_ID AS INTEGER START WITH 12345;
CREATE TABLE SUB_TABLE(
"ID_NUM" NUMBER NOT NULL,
"SUB_ID" NUMBER(15,0) NOT NULL ,
"FAMILY_IDENTIFIER" VARCHAR2(15 BYTE),
"IND_NUM" VARCHAR2(10 BYTE),
CONSTRAINT "PK_SUB_TABLE" PRIMARY KEY ("SUB_ID"),
CONSTRAINT "FK_SUB_TABLE_1" FOREIGN KEY ("ID_NUM") REFERENCES "MAIN_TABLE" ("ID_NUM")
);
CREATE TABLE SUB_SUB_TABLE(
"ID_NUM" NUMBER,
"CODE" VARCHAR2(5 BYTE),
"IND_NUM" VARCHAR2(10 BYTE),
CONSTRAINT "PK_SUB_SUB_TABLE" PRIMARY KEY ("ID_NUM", "CODE", "IND_NUM")
);
CREATE TABLE "ANOTHER_SUB_SUB_TABLE"(
"ID_NUM" NUMBER,
"PERSON" VARCHAR2(1 BYTE),
"SOURCE_CODE" VARCHAR2(5 BYTE),
CONSTRAINT "PK_ANOTHER_SUB_SUB_TABLE" PRIMARY KEY ("ID_NUM", "PERSON", "SOURCE_CODE"),
CONSTRAINT "FK_ANOTHER_SUB_SUB_TABLE_1" FOREIGN KEY ("ID_NUM") REFERENCES "MAIN_TABLE" ("ID_NUM")
);
INSERT INTO MAIN_TABLE(ID_NUM) VALUES (99427);
INSERT INTO SUB_TABLE(ID_NUM, SUB_ID, FAMILY_IDENTIFIER, IND_NUM) VALUES (99427, 1, 'A', '123A');
INSERT INTO SUB_TABLE(ID_NUM, SUB_ID, FAMILY_IDENTIFIER, IND_NUM) VALUES (99427, 2, 'S', '321A');
INSERT INTO SUB_SUB_TABLE(ID_NUM, CODE, IND_NUM) VALUES (99427, 'CODE1', '123A');
如果我运行一个测试用例:
@RunWith(SpringRunner.class)
@SpringBootTest
@Transactional
public class MainRepoTest {
@Autowired
private MainRepo mainRepo;
@Test
public void testFind() {
mainRepo.findAll();
}
@Test
public void deleteSubEntity() {
MainEntity mainEntity = mainRepo.findOne(99427L);
Optional<SubEntity> subEntityToRemove = mainEntity.getSubEntities().stream().filter(subEntity -> "123A".equals(subEntity.getIndNum())).findFirst();
if(subEntityToRemove.isPresent()) {
// System.out.println(subEntityToRemove.get());
mainEntity.removeSubEntity(subEntityToRemove.get());
mainRepo.saveAndFlush(mainEntity);
}
}
}
此测试引发以下异常:
java.lang.NullPointerException
at org.hibernate.collection.internal.PersistentBag.iterator(PersistentBag.java:278)
at org.hibernate.type.CollectionType.getElementsIterator(CollectionType.java:229)
at org.hibernate.type.CollectionType.getElementsIterator(CollectionType.java:219)
at org.hibernate.engine.spi.CascadingActions.getAllElementsIterator(CascadingActions.java:477)
at org.hibernate.engine.spi.CascadingActions.access$100(CascadingActions.java:33)
at org.hibernate.engine.spi.CascadingActions$1.getCascadableChildrenIterator(CascadingActions.java:66)
at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:429)
at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:363)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:326)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:162)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:111)
at org.hibernate.event.internal.DefaultDeleteEventListener.cascadeBeforeDelete(DefaultDeleteEventListener.java:336)
at org.hibernate.event.internal.DefaultDeleteEventListener.deleteEntity(DefaultDeleteEventListener.java:258)
at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:143)
at org.hibernate.internal.SessionImpl.fireDelete(SessionImpl.java:930)
at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:874)
at org.hibernate.engine.internal.Cascade.deleteOrphans(Cascade.java:493)
at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:466)
at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:363)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:326)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:162)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:111)
at org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:150)
at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:141)
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:74)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:38)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1282)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:1300)
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:498)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:298)
at com.sun.proxy.$Proxy79.flush(Unknown Source)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.flush(SimpleJpaRepository.java:555)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.saveAndFlush(SimpleJpaRepository.java:523)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:513)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:498)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:475)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:56)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy81.saveAndFlush(Unknown Source)
at com.example.repo.MainRepoTest.deleteSubEntity(MainRepoTest.java:35)
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:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
但是,如果我取消注释从子实体输出 toString 的行,效果会很好。我认为是因为当我删除子实体时,惰性集合没有初始化。在 Spring Data Jpa/Hibernate 中是否有一种优雅的方法来跳过此错误?
最佳答案
如果你可以用 this test case template 复制它针对最新版本的 Hibernate(例如 5.2.13)。那么你应该打开一个 Jira 问题。
关于java - 将带有 @ManyToOne 的子实体删除到其他实体时出现 NullPointerException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48764921/
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