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<p>JOTM(Java Open Transaction Manager)是ObjectWeb的一个开源JTA实现，本身也是开源应用程序服务器JOnAS(Java Open Application Server)的一部分，为其提供JTA分布式事务的功能。Spring对JOTM提供了较好的支持，提供了一个org.springframework.transaction.jta.JotmFactoryBean的支持类，在Spring2.0中也包含了JOTM相关的一些library。 <br>jotm的下载地址为http://jotm.objectweb.org,最新版本为2.0.10. <br>下载完成后解压缩，然后打开jotm下面conf文件夹，拷贝carol.properties文件到classpath中，并修改这个文件如下 <br>carol.properties </p> <p>Java代码 <a href="http://tom-duan.javaeye.com/blog/147594#"></a></p> <ol> <li># do not use CAROL JNDI wrapper </li> <li>carol.start.jndi=false</li> <li> </li> <li># do not start a name server </li> <li>carol.start.ns=false</li> <li> </li> <li># Naming Factory </li> <li>carol.jndi.java.naming.factory.url.pkgs=org.apache.naming </li> </ol> <pre># do not use CAROL JNDI wrapper carol.start.jndi=false # do not start a name server carol.start.ns=false # Naming Factory carol.jndi.java.naming.factory.url.pkgs=org.apache.naming</pre> <br>上面配置文件的目的是不使用JNDI的方式来加载JOTM的配置，当然也可以根据需要选择其它的一些配置，例如JTOM所提供的默认配置。 <br>然后开始在Spring上下文中配置JOTM，在classpath中建立一个ApplicationContext-jotm.xml，配置如下 <br>ApplicationContext-jotm.xml <p>Java代码 <a href="http://tom-duan.javaeye.com/blog/147594#"></a></p> <ol> <li><?xml version="1.0" encoding="UTF-8"?> </li> <li><beans xmlns="http://www.springframework.org/schema/beans"</li> <li> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"</li> <li> xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> </li> <li> </li> <li> <bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean"/> </li> <li> </li> <li> <bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager"> </li> <li> <property name="userTransaction" ref="jotm" /> </li> <li> </bean> </li> <li> </li> <li> <bean id="ds1" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource" destroy-method="shutdown"> </li> <li> <property name="dataSource"> </li> <li> <bean class="org.enhydra.jdbc.standard.StandardXADataSource" destroy-method="shutdown"> </li> <li> <property name="transactionManager" ref="jotm" /> </li> <li> <property name="driverName" value="com.mysql.jdbc.Driver" /> </li> <li> <property name="url" value="jdbc:MySQL://localhost:3306/test" /> </li> <li> </bean> </li> <li> </property> </li> <li> <property name="user" value="root" /> </li> <li> <property name="password" value="admin" /> </li> <li> </bean> </li> <li> </li> <li> <bean id="ds2" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource" destroy-method="shutdown"> </li> <li> <property name="dataSource"> </li> <li> <bean class="org.enhydra.jdbc.standard.StandardXADataSource" destroy-method="shutdown"> </li> <li> <property name="transactionManager" ref="jotm" /> </li> <li> <property name="driverName" value="com.mysql.jdbc.Driver" /> </li> <li> <property name="url" value="jdbc:MySQL://localhost:3306/test2" /> </li> <li> </bean> </li> <li> </property> </li> <li> <property name="user" value="root" /> </li> <li> <property name="password" value="admin" /> </li> <li> </bean> </li> <li> </li> <li> <bean id="template1" class="org.springframework.jdbc.core.JdbcTemplate"> </li> <li> <property name="dataSource" ref="ds1" /> </li> <li> </bean> </li> <li> </li> <li> <bean id="template2" class="org.springframework.jdbc.core.JdbcTemplate"> </li> <li> <property name="dataSource" ref="ds2" /> </li> <li> </bean> </li> <li> </li> <li> <bean id="dao1" class="com.xa.dao.UserDao1"> </li> <li> <property name="jdbcTemplate"> </li> <li> <ref bean="template1"></ref> </li> <li> </property> </li> <li> </bean> </li> <li> </li> <li> <bean id="dao2" class="com.xa.dao.UserDao2"> </li> <li> <property name="jdbcTemplate"> </li> <li> <ref bean="template2"></ref> </li> <li> </property> </li> <li> </bean> </li> <li> </li> <li> <bean id="userServiceTarget" class="com.xa.service.UserServiceImpl"> </li> <li> <property name="dao1" ref="dao1"/> </li> <li> <property name="dao2" ref="dao2"/> </li> <li> </bean> </li> <li> </li> <li> </li> <li> <bean id="userTest" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> </li> <li> <property name="transactionManager"> </li> <li> <ref bean="txManager"/> </li> <li> </property> </li> <li> <property name="target"> </li> <li> <ref bean="userServiceTarget"/> </li> <li> </property> </li> <li> <property name="transactionAttributes"> </li> <li> <props> </li> <li> <prop key="insert*">PROPAGATION_REQUIRED,-Exception</prop> </li> <li> </props> </li> <li> </property> </li> <li> </bean> </li> <li></beans> </li> </ol> <pre><?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean"/> <bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager"> <property name="userTransaction" ref="jotm" /> </bean> <bean id="ds1" 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="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:MySQL://localhost:3306/test" /> </bean> </property> <property name="user" value="root" /> <property name="password" value="admin" /> </bean> <bean id="ds2" 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="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:MySQL://localhost:3306/test2" /> </bean> </property> <property name="user" value="root" /> <property name="password" value="admin" /> </bean> <bean id="template1" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="ds1" /> </bean> <bean id="template2" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="ds2" /> </bean> <bean id="dao1" class="com.xa.dao.UserDao1"> <property name="jdbcTemplate"> <ref bean="template1"></ref> </property> </bean> <bean id="dao2" class="com.xa.dao.UserDao2"> <property name="jdbcTemplate"> <ref bean="template2"></ref> </property> </bean> <bean id="userServiceTarget" class="com.xa.service.UserServiceImpl"> <property name="dao1" ref="dao1"/> <property name="dao2" ref="dao2"/> </bean> <bean id="userTest" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> <property name="transactionManager"> <ref bean="txManager"/> </property> <property name="target"> <ref bean="userServiceTarget"/> </property> <property name="transactionAttributes"> <props> <prop key="insert*">PROPAGATION_REQUIRED,-Exception</prop> </props> </property> </bean> </beans></pre> <br>上面是一个完整的Spring上下文配置，可以看第一个bean “jotm”，实际上引用了Spring内部所提供的对JOTM支持的工厂类，参考下面的配置代码段 <p>Java代码 <a href="http://tom-duan.javaeye.com/blog/147594#"></a></p> <ol> <li><bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean"/> </li> </ol> <pre><bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean"/></pre> <br>随后，配置了JTA事务管理器，并且在管理器中使用上面所配置的jotm，如下面的代码 <p>Java代码 <a href="http://tom-duan.javaeye.com/blog/147594#"></a></p> <ol> <li><bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager"> </li> <li> <property name="userTransaction" ref="jotm" /> </li> <li></bean> </li> </ol> <pre><bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager"> <property name="userTransaction" ref="jotm" /> </bean></pre> <br>再接下来就是配置多个数据源了，使用jotm提供的org.enhydra.jdbc.pool.StandardXAPoolDataSource类，根据类名可以明确地看出它是用以配置多个数据源的啦,配置的代码如下 <p>Java代码 <a href="http://tom-duan.javaeye.com/blog/147594#"></a></p> <ol> <li><bean id="ds1" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource" destroy-method="shutdown"> </li> <li> <property name="dataSource"> </li> <li> <bean class="org.enhydra.jdbc.standard.StandardXADataSource" destroy-method="shutdown"> </li> <li> <property name="transactionManager" ref="jotm" /> </li> <li> <property name="driverName" value="com.mysql.jdbc.Driver" /> </li> <li> <property name="url" value="jdbc:MySQL://localhost:3306/test" /> </li> <li> </bean> </li> <li> </property> </li> <li> <property name="user" value="root" /> </li> <li> <property name="password" value="admin" /> </li> <li> </bean> </li> <li> </li> <li> <bean id="ds2" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource" destroy-method="shutdown"> </li> <li> <property name="dataSource"> </li> <li> <bean class="org.enhydra.jdbc.standard.StandardXADataSource" destroy-method="shutdown"> </li> <li> <property name="transactionManager" ref="jotm" /> </li> <li> <property name="driverName" value="com.mysql.jdbc.Driver" /> </li> <li> <property name="url" value="jdbc:MySQL://localhost:3306/test2" /> </li> <li> </bean> </li> <li> </property> </li> <li> <property name="user" value="root" /> </li> <li> <property name="password" value="admin" /> </li> <li> </bean> </li> </ol> <pre><bean id="ds1" 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="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:MySQL://localhost:3306/test" /> </bean> </property> <property name="user" value="root" /> <property name="password" value="admin" /> </bean> <bean id="ds2" 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="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:MySQL://localhost:3306/test2" /> </bean> </property> <property name="user" value="root" /> <property name="password" value="admin" /> </bean></pre> <br>这里配置的两个数据源都连接到本地的mysql，实际上可以连接到不同的db server和不同类型的数据库，已经经过测试，这里为了方便，在本地建立了两个不同的数据库(test,test2)做测试。 <br>随后的配置基本上和普通的Spring上下文配置相同了，根据不同的数据源配置两个jdbcTemplate，两个dao分别引用不同的jdbcTemplate, 将两个dao注入到UserService中, 最后将service纳入事务管理,并在事务代理配置中配置回滚规则,意思为如遇异常，则强制回滚内容。配置如下所示 <p>Java代码 <a href="http://tom-duan.javaeye.com/blog/147594#"></a></p> <ol> <li><property name="transactionAttributes"> </li> <li> <props> </li> <li> <prop key="insert*">PROPAGATION_REQUIRED,-Exception</prop> </li> <li> </props> </li> <li></property> </li> </ol> <pre><property name="transactionAttributes"> <props> <prop key="insert*">PROPAGATION_REQUIRED,-Exception</prop> </props> </property></pre> <br>这样，一个使用JOTM JTA事务的简单应用算大致成型了，最后，写一个JUnit，来测试一下结果 <br>TestXa.java <p>Java代码 <a href="http://tom-duan.javaeye.com/blog/147594#"></a></p> <ol> <li>package com.xa; </li> <li> </li> <li>import org.springframework.context.ApplicationContext; </li> <li>import org.springframework.test.AbstractDependencyInjectionSpringContextTests; </li> <li> </li> <li>import com.xa.service.UserService; </li> <li> </li> <li>public class TestXa extends AbstractDependencyInjectionSpringContextTests </li> <li>{ </li> <li>protected String[] getConfigLocations() { </li> <li>return new String[] { "classpath:ApplicationContext-jotm.xml" }; </li> <li> } </li> <li> </li> <li>public void testInsertBothDatabase() { </li> <li> ApplicationContext ctx = this.getApplicationContext(); </li> <li> UserService ut = (UserService)ctx.getBean("userTest"); </li> <li>try { </li> <li> ut.insertBothDatabase("1", null); </li> <li> } </li> <li>catch (Exception e) { </li> <li> e.printStackTrace(); </li> <li> } </li> <li> } </li> <li>} </li> </ol> <pre>package com.xa; import org.springframework.context.ApplicationContext; import org.springframework.test.AbstractDependencyInjectionSpringContextTests; import com.xa.service.UserService; public class TestXa extends AbstractDependencyInjectionSpringContextTests { protected String[] getConfigLocations() { return new String[] { "classpath:ApplicationContext-jotm.xml" }; } public void testInsertBothDatabase() { ApplicationContext ctx = this.getApplicationContext(); UserService ut = (UserService)ctx.getBean("userTest"); try { ut.insertBothDatabase("1", null); } catch (Exception e) { e.printStackTrace(); } } }</pre> <br>在test中，调用了UserService的insertBothDatabase方法，有两个参数，userId和UserName，另外在方法的实现中调用了两个使用不同数据源dao，分别向两个不同的数据库插入输入，而test2数据库的xa_test表中，name字段是不允许为空的，因此，在插入test2数据库时会失败. <br>运行这个test，然后察看数据库结果：），test和test2数据库中都没有插入成功，看serviceImpl中的代码可以知道，逻辑上dao1会先于dao2执行，但是由于JTA事务，在dao2插入数据出现异常时整个事务被回滚，由于事务被配置在service层，dao1和dao2都被纳入一个事务进行管理，呵呵。修改一下方法的参数，修改为 <p>Java代码 <a href="http://tom-duan.javaeye.com/blog/147594#"></a></p> <ol> <li>ut.insertBothDatabase("1", "name1"); </li> </ol> <pre>ut.insertBothDatabase("1", "name1");</pre> <br>然后再试试test看数据库结果，如何？

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