spring+jotm 多数据源事务管理(一)jdbc
spring+jotm 多数据源事务管理系列
spring+jotm 多数据源事务管理(一)jdbc
spring+jotm 多数据源事务管理(二)hibernate
spring+jotm 多数据源事务管理(三)JNDI+Tomcat
JOTM (Java Open Transaction Manager)是由ObjectWeb协会开发的功能完整的且资源开放的独立的事务管理器。
它提供了 JAVA 应用程序的事务支持，而且与 JTA（ JAVA 事务 API）兼容。您可以在JOTM home page 了解到更多的详细信息。
本文介绍如何在spring配置文件中加入jotm来实现多数据源事务控制。
先看一个没有加入jotm的例子 ：
<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:security="http://www.springframework.org/schema/security"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-2.0.xsd"
default-lazy-init="true">
<bean id="dataSource1"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName">
<value>${datasource1.driver}</value>
</property>
<property name="url">
<value>${datasource1.url}</value>
</property>
<property name="username">
<value>${datasource1.username}</value>
</property>
<property name="password">
<value>${datasource1.password}</value>
</property>
<property name="initialSize">
<value>5</value>
</property>
<property name="maxActive">
<value>10</value>
</property>
</bean>
<bean id="dataSource2"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName">
<value>${datasource2.driver}</value>
</property>
<property name="url">
<value>${datasource2.url}</value>
</property>
<property name="username">
<value>${datasource2.username}</value>
</property>
<property name="password">
<value>${datasource2.password}</value>
</property>
<property name="initialSize">
<value>5</value>
</property>
<property name="maxActive">
<value>10</value>
</property>
</bean>
<bean id="jdbcTemplate1" class="org.springframework.jdbc.core.JdbcTemplate"
p:dataSource-ref="dataSource1" />
<bean id="jdbcTemplate2" class="org.springframework.jdbc.core.JdbcTemplate"
p:dataSource-ref="dataSource2" />
<aop:config proxy-target-class="true">
<aop:pointcut id="servicePoint1"
expression="execution (* com.xxx.function.*.service.*Service*.* (..))" />
<aop:advisor pointcut-ref="servicePoint1" id="txAdvisor1"
advice-ref="txAdvice1" />
</aop:config>
<tx:advice id="txAdvice1" transaction-manager="transactionManager1">
<tx:attributes>
<tx:method name="find*" read-only="true" />
<tx:method name="get*" read-only="true" />
<tx:method name="query*" read-only="true" />
<tx:method name="load*" read-only="true" />
<tx:method name="add*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="create*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="save*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="update*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="modify*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="delete*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="remove*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="apply*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="handle*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
</tx:attributes>
</tx:advice>
<bean id="transactionManager1"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource1" />
</bean>
<aop:config proxy-target-class="true">
<aop:pointcut id="servicePoint2"
expression="execution (* com.xxx.function.*.service.*Service*.* (..))" />
<aop:advisor pointcut-ref="servicePoint2" id="txAdvisor2"
advice-ref="txAdvice2" />
</aop:config>
<tx:advice id="txAdvice2" transaction-manager="transactionManager1">
<tx:attributes>
<tx:method name="find*" read-only="true" />
<tx:method name="get*" read-only="true" />
<tx:method name="query*" read-only="true" />
<tx:method name="load*" read-only="true" />
<tx:method name="add*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="create*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="save*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="update*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="modify*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="delete*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="remove*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="apply*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="handle*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
</tx:attributes>
</tx:advice>
<bean id="transactionManager2"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource2" />
</bean>
</beans>
这样的配置不能够将两个数据源放到同一个事务中，一个事务回滚不会使另一个事务同时回滚，这样就会造成脏数据。
spring本身提供了对jotm的支持，所以spring整合jotm很方便，下面看加入jotm的例子 ：
<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:security="http://www.springframework.org/schema/security"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-2.0.xsd"
default-lazy-init="true">
<bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean" />
<bean id="transactionManager"
class="org.springframework.transaction.jta.JtaTransactionManager">
<property name="userTransaction" ref="jotm" />
</bean>
<bean id="dataSource1" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"
destroy-method="shutdown">
<property name="dataSource">
<bean class="org.enhydra.jdbc.standard.StandardXADataSource"
destroy-method="shutdown">
<property name="transactionManager" ref="jotm" />
<property name="driverName" value="${datasource1.driver}" />
<property name="url" value="${datasource1.url}" />
</bean>
</property>
<property name="user" value="${datasource1.username}" />
<property name="password" value="${datasource1.password}" />
</bean>
<bean id="dataSource2" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"
destroy-method="shutdown">
<property name="dataSource">
<bean class="org.enhydra.jdbc.standard.StandardXADataSource"
destroy-method="shutdown">
<property name="transactionManager" ref="jotm" />
<property name="driverName" value="${datasource2.driver}" />
<property name="url" value="${datasource2.url}" />
</bean>
</property>
<property name="user" value="${datasource2.username}" />
<property name="password" value="${datasource2.password}" />
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource1" />
</bean>
<bean id="jdbcTemplateDas" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource2" />
</bean>
<aop:config proxy-target-class="true">
<aop:pointcut id="servicePoint"
expression="execution (* com.xxx.function.*.service.*Service*.* (..))" />
<aop:advisor pointcut-ref="servicePoint" id="txAdvisor"
advice-ref="defaultTxAdvice" />
</aop:config>
<tx:advice id="defaultTxAdvice">
<tx:attributes>
<tx:method name="find*" read-only="true" />
<tx:method name="get*" read-only="true" />
<tx:method name="query*" read-only="true" />
<tx:method name="load*" read-only="true" />
<tx:method name="add*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="create*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="save*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="update*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="modify*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="delete*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="remove*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="apply*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
<tx:method name="handle*" propagation="REQUIRED"
rollback-for="java.lang.Exception" />
</tx:attributes>
</tx:advice>
</beans>
ok，这样两个数据源就会统一由jotm进行管理，代码层面不需要任何修改。
另外，在使用jotm时，可能会抛如下异常：
java.lang.NoSuchMethodError at:sun.rmi.transport.ObjectTable.getStub(Ljava/rmi/Remote;)Ljava/rmi/server/RemoteStub;
此时，在项目编译路径下新建一个属性文件，名称：carol.properties，即可解决问题。
# JNDI (Protocol Invocation) carol.protocols=jrmp # Local RMI Invocation carol.jvm.rmi.local.call=true # do not use CAROL JNDI wrapper carol.start.jndi=false # do not start a name server carol.start.ns=false carol.start.rmi=false # Naming Factory carol.jndi.java.naming.factory.url.pkgs=org.apache.naming