JPA 实体在 Ubuntu 上更新，但在 Windows 上抛出乐观锁定异常
JPA entity gets updated on Ubuntu but throws Optimistic Locking Exception on Windows
考虑这个例子，我在其中创建了两个 JPA 实体并使用 Spring Data JPA 存储库来执行简单的 CRUD -
import java.sql.Timestamp;
import javax.persistence.Version;
@MappedSuperclass
public class AbstractValueObject {
@Id
@GeneratedValue
private Long id;
@Version
@Column(name = "time_stamp")
private Timestamp version;
public Long getId() {
return id;
}
@Override
public String toString() {
if (id == null) {
return "";
}
return id.toString();
}
}
@Entity
@Table(name = "demo")
public class Demo extends AbstractValueObject {
private String name;
@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, mappedBy = "demo")
private List<Owner> owners;
public Demo() {
owners = new ArrayList<>();
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Owner> getOwners() {
return Collections.unmodifiableList(owners);
}
public void addOwner(Owner owner) {
this.owners.add(owner);
owner.setDemo(this);
}
public void addAllOwners(List<Owner> owners) {
this.owners.addAll(owners);
for (Owner owner : owners) {
owner.setDemo(this);
}
}
public void update(Demo demo) {
this.setName(demo.getName());
this.owners.clear();
this.addAllOwners(demo.getOwners());
}
}
@Entity
@Table(name = "owner")
public class Owner extends AbstractValueObject {
private String attribute;
@ManyToOne(cascade = CascadeType.ALL, optional = false)
@JoinColumn(name = "demo_id", nullable = false)
private Demo demo;
public String getAttribute() {
return attribute;
}
public void setAttribute(String attribute) {
this.attribute = attribute;
}
public Demo getDemo() {
return demo;
}
public void setDemo(Demo demo) {
this.demo = demo;
}
}
之后，我为 Demo 实体创建了一个 JPA 存储库，从 JpaRepository -
扩展
import org.springframework.data.jpa.repository.JpaRepository;
public interface DemoRepository extends JpaRepository<Demo, Long> {}
对应的服务实现-
import javax.annotation.Resource;
import org.springframework.transaction.annotation.Transactional;
public class DemoServiceImpl implements DemoService {
@Resource
private DemoRepository demoRepository;
@Override
@Transactional
public Demo create(Demo demo) {
return demoRepository.save(demo);
}
@Override
@Transactional
public Demo update(long id, Demo demo) {
Demo dbDemo = demoRepository.findOne(id);
if (dbDemo == null) {
return demo;
}
dbDemo.update(demo);
return dbDemo;
}
@Transactional
public void testRun() {
Owner owner = new Owner();
owner.setAttribute("attribute");
Demo demo = new Demo();
demo.setName("demo");
demo.addOwner(owner);
this.create(demo);
demo.setName("another");
this.update(demo.getId(), demo);
}
}
persistence.xml 文件 -
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="jpa-optimistic-locking" transaction-type="RESOURCE_LOCAL">
</persistence-unit>
</persistence>
Spring 应用-context.xml -
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.keertimaan.example.jpaoptimisticlocking" />
<jpa:repositories base-package="com.keertimaan.example.jpaoptimisticlocking.repository" />
<bean id="demoService" class="com.keertimaan.example.jpaoptimisticlocking.service.DemoServiceImpl" />
<!-- JPA/Database/Transaction Configuration -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test" />
<property name="user" value="root" />
<property name="password" value="admin123" />
<property name="minPoolSize" value="1" />
<property name="maxPoolSize" value="2" />
<property name="acquireIncrement" value="1" />
<property name="maxStatements" value="5" />
<property name="idleConnectionTestPeriod" value="500" />
<property name="maxIdleTime" value="1000" />
<property name="loginTimeout" value="800" />
</bean>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="jpa-optimistic-locking" />
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
<property name="persistenceProvider">
<bean class="org.hibernate.jpa.HibernatePersistenceProvider" />
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">validate</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
现在每当我尝试在 Windows 7 -
上更新这样的实体时
public class App {
public static void main(String[] args) {
DemoService demoService = (DemoService) SpringHelper.INSTANCE.getBean("demoService");
demoService.testRun();
}
}
我遇到这样的异常 -
Exception in thread "main"
org.springframework.orm.ObjectOptimisticLockingFailureException:
Object of class
[com.keertimaan.example.jpaoptimisticlocking.domain.Demo] with
identifier [4]: optimistic locking failed; nested exception is
org.hibernate.StaleObjectStateException: Row was updated or deleted by
another transaction (or unsaved-value mapping was incorrect) :
[com.keertimaan.example.jpaoptimisticlocking.domain.Demo#4] at
org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:228)
at
org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:155)
at
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:519)
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.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy31.testRun(Unknown Source) at
com.keertimaan.example.jpaoptimisticlocking.App.main(App.java:9)
Caused by: org.hibernate.StaleObjectStateException: Row was updated or
deleted by another transaction (or unsaved-value mapping was
incorrect) :
[com.keertimaan.example.jpaoptimisticlocking.domain.Demo#4] at
org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:2541)
at
org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3285)
at
org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3183)
at
org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3525)
at
org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:159)
at
org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:463)
at
org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:349)
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)
at
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:515)
... 9 more
如果我 运行 Ubuntu 中的相同示例，那么 我完全没有异常并且我的应用程序成功完成 。这是为什么？
我正在使用 Windowsw 7 64 位版本 -
OS Name: Microsoft Windows 7 Enterprise
OS Version: 6.1.7601 Service Pack 1 Build 7601
我的Ubuntu版本是12.04.5 64位版。
JDK用于Windows：jdk7更新75
JDK用于Ubuntu：jdk7更新51
MySQL Windows 中的服务器版本：5.6.23-log MySQL 社区服务器 (GPL)
MySQL Ubuntu 中的服务器版本：5.5.41-0ubuntu0.12.04.1 (Ubuntu)
感觉这跟MySQL5.6的时间戳精度有关。 MySQL5.6.4引入微秒精度，会造成版本不匹配，加锁失败
这与您的问题没有直接关系，但在 高度并发的 环境中，您不应使用 timestamp 作为您的 version，因为两个实体可能有同一时间！最好使用如下所示的 long/int 版本-
@Version
long version;
另外，从设计的角度来看，请让您的超级 class abstract 也一样。你能看看改变这些是否能解决你的问题吗？
考虑这个例子，我在其中创建了两个 JPA 实体并使用 Spring Data JPA 存储库来执行简单的 CRUD -
import java.sql.Timestamp;
import javax.persistence.Version;
@MappedSuperclass
public class AbstractValueObject {
@Id
@GeneratedValue
private Long id;
@Version
@Column(name = "time_stamp")
private Timestamp version;
public Long getId() {
return id;
}
@Override
public String toString() {
if (id == null) {
return "";
}
return id.toString();
}
}
@Entity
@Table(name = "demo")
public class Demo extends AbstractValueObject {
private String name;
@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, mappedBy = "demo")
private List<Owner> owners;
public Demo() {
owners = new ArrayList<>();
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Owner> getOwners() {
return Collections.unmodifiableList(owners);
}
public void addOwner(Owner owner) {
this.owners.add(owner);
owner.setDemo(this);
}
public void addAllOwners(List<Owner> owners) {
this.owners.addAll(owners);
for (Owner owner : owners) {
owner.setDemo(this);
}
}
public void update(Demo demo) {
this.setName(demo.getName());
this.owners.clear();
this.addAllOwners(demo.getOwners());
}
}
@Entity
@Table(name = "owner")
public class Owner extends AbstractValueObject {
private String attribute;
@ManyToOne(cascade = CascadeType.ALL, optional = false)
@JoinColumn(name = "demo_id", nullable = false)
private Demo demo;
public String getAttribute() {
return attribute;
}
public void setAttribute(String attribute) {
this.attribute = attribute;
}
public Demo getDemo() {
return demo;
}
public void setDemo(Demo demo) {
this.demo = demo;
}
}
之后，我为 Demo 实体创建了一个 JPA 存储库，从 JpaRepository -
import org.springframework.data.jpa.repository.JpaRepository;
public interface DemoRepository extends JpaRepository<Demo, Long> {}
对应的服务实现-
import javax.annotation.Resource;
import org.springframework.transaction.annotation.Transactional;
public class DemoServiceImpl implements DemoService {
@Resource
private DemoRepository demoRepository;
@Override
@Transactional
public Demo create(Demo demo) {
return demoRepository.save(demo);
}
@Override
@Transactional
public Demo update(long id, Demo demo) {
Demo dbDemo = demoRepository.findOne(id);
if (dbDemo == null) {
return demo;
}
dbDemo.update(demo);
return dbDemo;
}
@Transactional
public void testRun() {
Owner owner = new Owner();
owner.setAttribute("attribute");
Demo demo = new Demo();
demo.setName("demo");
demo.addOwner(owner);
this.create(demo);
demo.setName("another");
this.update(demo.getId(), demo);
}
}
persistence.xml 文件 -
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="jpa-optimistic-locking" transaction-type="RESOURCE_LOCAL">
</persistence-unit>
</persistence>
Spring 应用-context.xml -
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.keertimaan.example.jpaoptimisticlocking" />
<jpa:repositories base-package="com.keertimaan.example.jpaoptimisticlocking.repository" />
<bean id="demoService" class="com.keertimaan.example.jpaoptimisticlocking.service.DemoServiceImpl" />
<!-- JPA/Database/Transaction Configuration -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test" />
<property name="user" value="root" />
<property name="password" value="admin123" />
<property name="minPoolSize" value="1" />
<property name="maxPoolSize" value="2" />
<property name="acquireIncrement" value="1" />
<property name="maxStatements" value="5" />
<property name="idleConnectionTestPeriod" value="500" />
<property name="maxIdleTime" value="1000" />
<property name="loginTimeout" value="800" />
</bean>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="jpa-optimistic-locking" />
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
<property name="persistenceProvider">
<bean class="org.hibernate.jpa.HibernatePersistenceProvider" />
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">validate</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
现在每当我尝试在 Windows 7 -
上更新这样的实体时public class App {
public static void main(String[] args) {
DemoService demoService = (DemoService) SpringHelper.INSTANCE.getBean("demoService");
demoService.testRun();
}
}
我遇到这样的异常 -
Exception in thread "main" org.springframework.orm.ObjectOptimisticLockingFailureException: Object of class [com.keertimaan.example.jpaoptimisticlocking.domain.Demo] with identifier [4]: optimistic locking failed; nested exception is org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) : [com.keertimaan.example.jpaoptimisticlocking.domain.Demo#4] at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:228) at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:155) at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:519) 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.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) at com.sun.proxy.$Proxy31.testRun(Unknown Source) at com.keertimaan.example.jpaoptimisticlocking.App.main(App.java:9) Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) : [com.keertimaan.example.jpaoptimisticlocking.domain.Demo#4] at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:2541) at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3285) at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3183) at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3525) at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:159) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:463) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:349) 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) at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:515) ... 9 more
如果我 运行 Ubuntu 中的相同示例，那么 我完全没有异常并且我的应用程序成功完成 。这是为什么？
我正在使用 Windowsw 7 64 位版本 -
OS Name: Microsoft Windows 7 Enterprise
OS Version: 6.1.7601 Service Pack 1 Build 7601
我的Ubuntu版本是12.04.5 64位版。
JDK用于Windows：jdk7更新75
JDK用于Ubuntu：jdk7更新51
MySQL Windows 中的服务器版本：5.6.23-log MySQL 社区服务器 (GPL)
MySQL Ubuntu 中的服务器版本：5.5.41-0ubuntu0.12.04.1 (Ubuntu)
感觉这跟MySQL5.6的时间戳精度有关。 MySQL5.6.4引入微秒精度，会造成版本不匹配，加锁失败
这与您的问题没有直接关系，但在 高度并发的 环境中，您不应使用 timestamp 作为您的 version，因为两个实体可能有同一时间！最好使用如下所示的 long/int 版本-
@Version
long version;
另外，从设计的角度来看，请让您的超级 class abstract 也一样。你能看看改变这些是否能解决你的问题吗？