spring-data-jpa通过Atomikos实现JTA事务

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随想杂谈

atomikos jta spring-data-jpa hibernate jdbcdslog

最近刚搭建一个Atomikos实现的JTA，数据库持久层用的spring-data-jpa，底层实现是Hibernate。

一.环境

spring 3.2.6.RELEASE

hibernate 4.2.8.Final

spring-data-jpa 1.4.3.RELEASE

atomikos.version 3.9.2

永久链接: http://sgq0085.iteye.com/blog/2001918

atomikos在Maven环境中导入依赖如下

<!-- atomikos -->
<dependency>
    <groupId>com.atomikos</groupId>
    <artifactId>transactions-jdbc</artifactId>
    <version>3.9.2</version>
</dependency>
<dependency>
    <groupId>com.atomikos</groupId>
    <artifactId>transactions-hibernate3</artifactId>
    <version>3.9.2</version>
</dependency>
<dependency>
    <groupId>javax.transaction</groupId>
    <artifactId>jta</artifactId>
    <version>1.1</version>
</dependency>

atomikos依赖结构如下

[INFO] +- com.atomikos:transactions-jdbc:jar:3.9.2:compile
[INFO] |  \- com.atomikos:transactions-jta:jar:3.9.2:compile
[INFO] |     \- com.atomikos:transactions:jar:3.9.2:compile
[INFO] |        \- com.atomikos:transactions-api:jar:3.9.2:compile
[INFO] |           \- com.atomikos:atomikos-util:jar:3.9.2:compile
[INFO] +- com.atomikos:transactions-hibernate3:jar:3.9.2:compile
[INFO] +- javax.transaction:jta:jar:1.1:compile

二.配置

1.web.xml

spring.profiles.default为了配合配置文件applicationContext.xml中<beans profile="development">标签，用于管理多套环境

<context-param>
    <param-name>spring.profiles.default</param-name>
    <param-value>development</param-value>
</context-param>

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        classpath*:/applicationContext.xml
    </param-value>
</context-param>

<!-- 不一定都用得到 -->
 <filter>
    <filter-name>openEntityManagerInViewFilter</filter-name>
    <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
    <init-param>
        <param-name>entityManagerFactoryBeanName</param-name>
        <param-value>entityManagerFactory1</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>openEntityManagerInViewFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

2.persistence.xml

<?xml version="1.0" encoding="UTF-8"?>  
<persistence xmlns="http://java.sun.com/xml/ns/persistence"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"  
    version="2.0">  
    <persistence-unit name="PU1" transaction-type="JTA">  
    </persistence-unit>  
    <persistence-unit name="PU2" transaction-type="JTA">  
    </persistence-unit>  
</persistence>

这里JPA 不在 persistence.xml 文件中配置每个Entity实体类，在后面的applicationContext.xml中通过<property name="packagesToScan" value="com.myapp" />去扫描所有标记@Entity注解的PO。

3.application.properties

数据库一个Oracle，一个H2

#development
dev.jdbc.driver=oracle.jdbc.driver.OracleDriver
dev.jdbc.url=jdbc:oracle:thin:@192.168.3.129:1521:gtf
dev.jdbc.username=my_app
dev.jdbc.password=my_app

dev.jdbc.driver2=org.h2.jdbcx.JdbcDataSource
dev.jdbc.url2=jdbc:h2:file:~/.h2/myapp;AUTO_SERVER=TRUE;DB_CLOSE_ON_EXIT=FALSE
dev.jdbc.username2=sa
dev.jdbc.password2=

databasePlatform.oracle=org.hibernate.dialect.Oracle10gDialect
databasePlatform.h2=org.hibernate.dialect.H2Dialect

4.applicationContext.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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd">
    
    <description>Spring公共配置</description>

    <!-- 使用annotation 自动注册bean,并检查@Required,@Autowired的属性已被注入 -->
    <context:component-scan base-package="com.gqshao.myapp">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
        <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice" />
    </context:component-scan>

    <bean id="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp">
        <property name="transactionTimeout" value="300" />
    </bean>

    <bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager" init-method="init"
        destroy-method="close">
        <property name="forceShutdown" value="true" />
        <property name="transactionTimeout" value="300" />
    </bean>

    <!-- 事务管理器配置, JTA数据源事务 -->
    <bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="transactionManager" ref="atomikosTransactionManager" />
        <property name="userTransaction" ref="atomikosUserTransaction" />
        <property name="allowCustomIsolationLevels" value="true" />
    </bean>

    <!-- 使用annotation定义事务 -->
    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />

    <!-- 定义aspectj -->
    <aop:aspectj-autoproxy proxy-target-class="true" />

    <bean id="hibernateJpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <!-- <property name="databasePlatform" value="${oracle.databasePlatform}" /> -->
        <property name="databasePlatform">
            <bean factory-method="getDialect" class="com.gqshao.myapp.common.persistence.Hibernates">
                <constructor-arg ref="dataSource" />
            </bean>
        </property>
        <property name="showSql" value="false" />
        <property name="generateDdl" value="true" />
        <property name="database" value="ORACLE" />
    </bean>

    <!-- Jpa Entity Manager1 配置 -->
    <bean id="entityManagerFactory1" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceXmlLocation" value="classpath*:/persistence.xml" />
        <property name="persistenceUnitName" value="PU1" />
        <property name="dataSource" ref="dataSource" />
        <property name="jpaVendorAdapter" ref="hibernateJpaVendorAdapter" />
        <property name="packagesToScan" value="com.gqshao.myapp" />
        <property name="jpaProperties">
            <props>
                <!-- 不开启二级缓存 -->
                <prop key="hibernate.cache.use_second_level_cache">false</prop>
                <prop key="hibernate.generate_statistics">false</prop>
                <prop key="hibernate.connection.release_mode">after_statement</prop>
                <!-- 命名规则 My_NAME->MyName -->
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">none</prop>
                <prop key="hibernate.connection.driver_class">oracle.jdbc.xa.client.OracleXADataSource</prop>
                <prop key="hibernate.current_session_context_class">jta</prop>
                <prop key="hibernate.transaction.manager_lookup_class">com.atomikos.icatch.jta.hibernate3.TransactionManagerLookup</prop>
            </props>
        </property>
    </bean>

    <!-- Spring Data Jpa配置, 扫描base-package下所有继承于Repository<T,ID>的接口 -->
    <jpa:repositories base-package="com.gqshao.myapp.**.dao" transaction-manager-ref="transactionManager"
        entity-manager-factory-ref="entityManagerFactory1" />

    <!-- Jpa Entity Manager2 配置 -->
    <bean id="entityManagerFactory2" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceXmlLocation" value="classpath*:/persistence.xml" />
        <property name="persistenceUnitName" value="PU2" />
        <property name="dataSource" ref="dataSource2" />
        <property name="jpaVendorAdapter" ref="hibernateJpaVendorAdapter" />
        <property name="packagesToScan" value="com.gqshao.myapp" />
        <property name="jpaProperties">
            <props>
                <!-- 不开启二级缓存 -->
                <prop key="hibernate.cache.use_second_level_cache">false</prop>
                <prop key="hibernate.generate_statistics">false</prop>
                <prop key="hibernate.connection.release_mode">after_statement</prop>
                <!-- 命名规则 My_NAME->MyName -->
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">none</prop>
                <prop key="hibernate.connection.driver_class">oracle.jdbc.xa.client.OracleXADataSource</prop>
                <prop key="hibernate.current_session_context_class">jta</prop>
                <prop key="hibernate.transaction.manager_lookup_class">com.atomikos.icatch.jta.hibernate3.TransactionManagerLookup</prop>
            </props>
        </property>
    </bean>

    <!-- Spring Data Jpa配置, 扫描base-package下所有继承于Repository<T,ID>的接口 -->
    <jpa:repositories base-package="com.gqshao.myapp.**.repository" transaction-manager-ref="transactionManager"
        entity-manager-factory-ref="entityManagerFactory2" />

    <!-- local development环境 -->
    <beans profile="development">
        <context:property-placeholder location="classpath*:/application.properties"
            ignore-resource-not-found="true" />

        <!-- 数据源1 -->
        <bean id="dataSource" class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close">
            <property name="uniqueResourceName" value="XA1DBMS" />
            <property name="xaDataSourceClassName" value="${dev.jdbc.driver}" />
            <property name="xaProperties">
                <props>
                    <prop key="URL">${dev.jdbc.url}</prop>
                    <prop key="user">${dev.jdbc.username}</prop>
                    <prop key="password">${dev.jdbc.password}</prop>
                </props>
            </property>
            <property name="poolSize" value="10" />
            <property name="minPoolSize" value="10" />
            <property name="maxPoolSize" value="30" />
        </bean>

        <!-- 数据源2 -->
        <bean id="dataSource2" class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close">
            <property name="uniqueResourceName" value="XA2DBMS" />
            <property name="xaDataSourceClassName" value="${dev.jdbc.driver2}" />
            <property name="xaProperties">
                <props>
                    <prop key="URL">${dev.jdbc.url2}</prop>
                    <prop key="user">${dev.jdbc.username2}</prop>
                    <prop key="password">${dev.jdbc.password2}</prop>
                </props>
            </property>
            <property name="poolSize" value="10" />
            <property name="minPoolSize" value="10" />
            <property name="maxPoolSize" value="30" />
        </bean>
    </beans>
</beans>

注意:

1.Entity可以被两个EntityManagerFactory同时扫描到

2.通过jpa:repositories的base-package来区分两个EntityManagerFactory维护的持久层在这里这个用dao包,另一个用repository

三.测试

-------------- 表1 ------------
create table jta_pu1 (
	id char(32),
	description varchar2(255),
    primary key (id)
);

-------------- 表2 ------------
create table jta_pu2 (
	id char(32),
	description varchar2(255),
    primary key (id)
);

在Oracle中建表1

在H2中表1和表2都建

三个Entity类

package com.myapp.jta.entity;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;

import org.hibernate.annotations.GenericGenerator;

@MappedSuperclass
public abstract class BaseEntity implements Serializable {

	private static final long serialVersionUID = 1L;
	protected String id;

	@Id
	@Column(name = "id", nullable = false)
	@GeneratedValue(generator = "system-uuid")
	@GenericGenerator(name = "system-uuid", strategy = "uuid")
	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}
}

package com.myapp.jta.entity;

import javax.persistence.Entity;
import javax.persistence.Table;

@Entity
@Table(name = "JTA_PU1")
public class PU1 extends BaseEntity {

    private String description;

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

package com.myapp.jta.entity;

import javax.persistence.Entity;
import javax.persistence.Table;

@Entity
@Table(name = "JTA_PU2")
public class PU2 extends BaseEntity {

    private String description;

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

三个数据库持久层类

对应数据源一

package com.myapp.jta.dao;

import org.springframework.data.jpa.repository.JpaRepository;

import com.myapp.jta.entity.PU1;

public interface PU1Dao extends JpaRepository<PU1, Integer> {

}

对应数据源二

package com.myapp.jta.repository;

import org.springframework.data.jpa.repository.JpaRepository;

import com.myapp.jta.entity.PU1;

public interface PU1Repository extends JpaRepository<PU1, Integer> {

}

package com.myapp.jta.repository;

import org.springframework.data.jpa.repository.JpaRepository;

import com.myapp.jta.entity.PU2;

public interface PU2Repository extends JpaRepository<PU2, Integer> {

}

注意源一对应的包名是dao，源二对应的包名是repository

Service比较简单只有一个save,第一次不抛出异常，第二次抛出异常来测试事务回滚。

package com.myapp.jta.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.myapp.jta.dao.PU1Dao;
import com.myapp.jta.entity.PU1;
import com.myapp.jta.entity.PU2;
import com.myapp.jta.repository.PU1Repository;
import com.myapp.jta.repository.PU2Repository;

@Service
@Transactional
public class JTAService {

    @Value("${property.value}")
    private String propertyValue;

    @Autowired
    private PU1Dao pu1Dao;

    @Autowired
    private PU1Repository pu1Repository;

    @Autowired
    private PU2Repository pu2Repository;

    public void save() {
        PU1 pu = new PU1();
        pu.setDescription(propertyValue);
        pu1Dao.save(pu);
        pu1Repository.save(pu);

        PU2 pu2 = new PU2();
        pu2.setDescription("pu2");
        pu2Repository.save(pu2);
        // throw new RuntimeException();
    }
}

JUnit4的测试用例

package com.myapp.jta.service;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.transaction.TransactionConfiguration;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "/applicationContext.xml"})
@ActiveProfiles("development")
@TransactionConfiguration(transactionManager = "transactionManager", defaultRollback = false)
public class JTAServiceTest {

    @Autowired
    private JTAService jtaService;

    @Test
    public void savePU1() {
        jtaService.save();
    }
}

说明，同一个EntityPU1分别被保存到数据源一和数据源二中，但通过查询数据库可以看到第一次保存的时候id被赋值，第二次保存的时候id没有再做修改。但查询数据库，发现第二次的id与第一次的不同。所以真有同一个Entity保存到两个数据库中的需求时，推荐在保存之前深拷贝一份出来，分别保存。

永久链接: http://sgq0085.iteye.com/blog/2001918

注意两个离奇错误

错误1: 数据库必须是DBA，否则出错 (具体哪个权限没有去排查，感兴趣找到了告诉我)

错误2:用maven tomcat7-maven-plugin插件时小心useTestClasspath需要是false

DEMO中在使用jdbcdslog的基础上，修改Atomikos核心类，实现JTA管理数据源下SQL的输出。

注意:该方法未经过大量测试，只适用于开发环境，生产环境不可以使用。

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2014-01-09 17:37
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