JTA可以在多个数据库上使用一个事务，weblogic等应用服务器提供了jta数据源的支持，可以直接被使用。但是tomcat本身并不支持这种特性。如果想在tomcat上使用jta就必须使用其它的工具。jotm就是一个独立的可以提供JTA功能的组件。

<?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:aop="http://www.springframework.org/schema/aop"    xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">  <description>springJTA</description>  <!--指定Spring配置中用到的属性文件    <bean id="propertyConfig"    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">    <property name="locations">    <list>    <value>classpath:jdbc.properties</value>    </list>    </property>    </bean>       --><!-- JOTM实例 -->  <bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean">  <property name="defaultTimeout" value="500000"/>  </bean>  <!-- JTA事务管理器 -->  <bean id="jtaTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">      <property name="userTransaction" ref="jotm" />      </bean>  <!-- 数据源A -->    <bean id="dataSourceA" 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/emp_mvc"/>    </bean>    </property>    <property name="user" value="root"/>    <property name="password" value="123456"/>    </bean>    <!-- 数据源B -->    <bean id="dataSourceB" 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/emp_mvc2"/>    </bean>    </property>    <property name="user" value="root"/>    <property name="password" value="123456"/>    </bean>    <bean id = "sessionFactoryA"    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"><property name = "dataSource" ref="dataSourceA"/><property name="mappingResources"><list>        <value>com/ouku/JOTM/entity/Emp.hbm.xml</value></list></property>    </bean>  <bean id = "sessionFactoryB"    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">   <property name = "dataSource" ref="dataSourceB"/><property name="mappingResources"><list>        <value>com/ouku/JOTM/entity/Emp2.hbm.xml</value></list></property>    </bean>       <!-- 事务切面配置 -->    <aop:config>    <aop:pointcut id="pointCut"  expression="execution(* com.ouku.JOTM..*.*(..))"/><!-- 包及其子包下的所有方法 -->  <aop:advisor pointcut-ref="pointCut" advice-ref="txAdvice"/>    <aop:advisor pointcut="execution(* *..ouku.JOTM.*.*(..))" advice-ref="txAdvice"/>  </aop:config>    <!-- 通知配置 -->    <tx:advice id="txAdvice" transaction-manager="jtaTransactionManager">    <tx:attributes>    <tx:method name="delete*" rollback-for="Exception"/>    <tx:method name="save*" rollback-for="Exception"/>    <tx:method name="update*" rollback-for="Exception"/>    <tx:method name="find*" read-only="true" rollback-for="Exception"/>  <tx:method name="*" read-only="true" rollback-for="Exception"/>    </tx:attributes>    </tx:advice>    <bean id="genericDao"    class="com.ouku.JOTM.DAO.GenericDaoImpl" autowire="byName"> <property name="sessionFactoryA" ref="sessionFactoryA"></property> <property name="sessionFactoryB" ref="sessionFactoryB"></property> </bean>  <bean id="userService"    class="com.ouku.JOTM.biz.UserServiceImpl" autowire="byName">  </bean>  </beans>

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