问题：
对象引用未保存的瞬态实例-在刷新之前保存瞬态实例：com.entity.role
荆城
<!-- Hibernate -->
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>2.3.2</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.3.4.Final</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.8.1.RELEASE</version>
</dependency>
@Entity
public class Role {
@Id
@GeneratedValue
private Integer id = 0;
private String name = null;
@ManyToMany
@JoinTable
private List<User> users = null;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<User> getUsers() {
return users;
}
public void setUsers(List<User> users) {
this.users = users;
} }
user.java是
@Entity
public class User {
@Id
@GeneratedValue
private Integer id = 0;
private String name = null;
private String email = null;
private String password = null;
@ManyToMany
private List<Role> roles = null;
@OneToMany(mappedBy="user")
private List<Blog> blogs = null;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public List<Role> getRoles() {
return roles;
}
public void setRoles(List<Role> roles) {
this.roles = roles;
}
public List<Blog> getBlogs() {
return blogs;
}
public void setBlogs(List<Blog> blogs) {
this.blogs = blogs;
}}
我正在使用这个视频中提到的存储库，是
import org.springframework.data.jpa.repository.JpaRepository;
import com.entity.Role;
public interface RoleRepository extends JpaRepository<Role, Integer> {
}
和
import org.springframework.data.jpa.repository.JpaRepository;
import com.entity.User;
public interface UserRepository extends JpaRepository<User, Integer> {
}
@Transactional
@Service
public class InitDbService {
@Autowired
private BlogRepository blogRepository = null;
@Autowired
private ItemRepository itemRepository = null;
@Autowired
private RoleRepository roleRepository = null;
@Autowired
private UserRepository userRepository = null;
@PostConstruct
private void init() {
Role roleUser = new Role();
roleUser.setName("ROLE_USER");
roleRepository.save(roleUser);
Role roleAdmin = new Role();
roleAdmin.setName("ROLE_ADMIN");
roleRepository.save(roleAdmin);
User userAdmin = new User();
userAdmin.setName("admin");
List<Role> roles = new ArrayList<Role>();
roles.add(roleAdmin);
roles.add(roleUser);
userAdmin.setRoles(roles);
userRepository.save(userAdmin);
//Test insert in to DB
Blog javaBlog = new Blog();
javaBlog.setName("Java Blog");
javaBlog.setUrl("http://security.stackexchange.com/");
javaBlog.setUser(userAdmin);
blogRepository.save(javaBlog);
Item item1 = new Item();
item1.setTitle("Java Blog");
item1.setBlog(javaBlog);
item1.setLink("http://security.stackexchange.com/");
item1.setPublishedDate(new Date());
itemRepository.save(item1);
Item item2 = new Item();
item2.setTitle("Java Blog two");
item2.setBlog(javaBlog);
item2.setLink("http://security.stackexchange.com/");
item2.setPublishedDate(new Date());
itemRepository.save(item2);
}
}
INFO: Initializing Spring root WebApplicationContext
Hibernate: alter table Blog drop constraint FK_thdkoy0q7vcgc5hay9wb99vnh
Hibernate: alter table Item drop constraint FK_il3204s0mf6d1m8am8f5768ah
Hibernate: alter table Role_User drop constraint FK_iha4m965rutefhrl4f2pvko39
Hibernate: alter table Role_User drop constraint FK_1rtsbyk364hixsho0345aj4sd
Hibernate: alter table User_Role drop constraint FK_tc5k40i3kit8944syrd366vy1
Hibernate: alter table User_Role drop constraint FK_dv4w2xni693cg4ibi3fo1fkk6
Hibernate: drop table Blog if exists
Hibernate: drop table Item if exists
Hibernate: drop table Role if exists
Hibernate: drop table Role_User if exists
Hibernate: drop table User if exists
Hibernate: drop table User_Role if exists
Hibernate: create table Blog (id integer generated by default as identity (start with 1), name varchar(255), url varchar(255), user_id integer, primary key (id))
Hibernate: create table Item (id integer generated by default as identity (start with 1), description varchar(255), link varchar(255), published_date timestamp, title varchar(255), blog_id integer, primary key (id))
Hibernate: create table Role (id integer generated by default as identity (start with 1), name varchar(255), primary key (id))
Hibernate: create table Role_User (Role_id integer not null, users_id integer not null)
Hibernate: create table User (id integer generated by default as identity (start with 1), email varchar(255), name varchar(255), password varchar(255), primary key (id))
Hibernate: create table User_Role (User_id integer not null, roles_id integer not null)
Hibernate: alter table Blog add constraint FK_thdkoy0q7vcgc5hay9wb99vnh foreign key (user_id) references User
Hibernate: alter table Item add constraint FK_il3204s0mf6d1m8am8f5768ah foreign key (blog_id) references Blog
Hibernate: alter table Role_User add constraint FK_iha4m965rutefhrl4f2pvko39 foreign key (users_id) references User
Hibernate: alter table Role_User add constraint FK_1rtsbyk364hixsho0345aj4sd foreign key (Role_id) references Role
Hibernate: alter table User_Role add constraint FK_tc5k40i3kit8944syrd366vy1 foreign key (roles_id) references Role
Hibernate: alter table User_Role add constraint FK_dv4w2xni693cg4ibi3fo1fkk6 foreign key (User_id) references User
Hibernate: insert into Role (id, name) values (default, ?)
Hibernate: insert into Role (id, name) values (default, ?)
Hibernate: insert into User (id, email, name, password) values (default, ?, ?, ?)
Hibernate: insert into User_Role (User_id, roles_id) values (?, ?)
Jul 9, 2015 3:29:43 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'initDbService': Invocation of init method failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.entity.Role; nested exception is java.lang.IllegalStateException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.entity.Role
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1566)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5014)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5528)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:717)
Caused by: org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.entity.Role; nested exception is java.lang.IllegalStateException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.entity.Role
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:378)
at org.springframework.orm.jpa.DefaultJpaDialect.translateExceptionIfPossible(DefaultJpaDialect.java:122)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:521)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:757)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:726)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:478)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:272)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.java:122)
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.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at $Proxy34.save(Unknown Source)
at com.service.InitDbService.init(InitDbService.java:56)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:613)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:349)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:300)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133)
... 24 more
Caused by: java.lang.IllegalStateException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.entity.Role
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1760)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
at org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:82)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:517)
... 46 more
Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.entity.Role
at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:294)
at org.hibernate.type.EntityType.getIdentifier(EntityType.java:537)
at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:165)
at org.hibernate.persister.collection.AbstractCollectionPersister.writeElement(AbstractCollectionPersister.java:899)
at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1308)
at org.hibernate.action.internal.CollectionRecreateAction.execute(CollectionRecreateAction.java:67)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:461)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:347)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1222)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:425)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:177)
at org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:77)
... 47 more
这个问题有什么更好的解决办法吗？
共有1个答案
狄阳华
您可以在@entity中进行更改，例如
@Entity
public class Role {
@Id
@GeneratedValue
private Integer id = 0;
private String name = null;
@ManyToMany(cascade = {CascadeType.ALL})
@JoinTable
private List<User> users = null;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<User> getUsers() {
return users;
}
public void setUsers(List<User> users) {
this.users = users;
} }
user.java
@Entity
public class User {
@Id
@GeneratedValue
private Integer id = 0;
private String name = null;
private String email = null;
private String password = null;
@ManyToMany(cascade = {CascadeType.ALL})
private List<Role> roles = null;
@OneToMany(mappedBy="user")
private List<Blog> blogs = null;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public List<Role> getRoles() {
return roles;
}
public void setRoles(List<Role> roles) {
this.roles = roles;
}
public List<Blog> getBlogs() {
return blogs;
}
public void setBlogs(List<Blog> blogs) {
this.blogs = blogs;
}}
如此这般，诸如此类。它可能会解决你的问题！试试这个，让我知道任何问题/成功。
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