JTA集成JOTM或Atomikos配置分布式事务(Tomcat应用服务器)
一.以下介绍Spring中直接集成JOTM提供JTA事务管理、将JOTM集成到Tomcat中。
（经过测试JOTM在批量持久化时有BUG需要修改源码GenericPool类解决)！
参考文章http://mavin.zhou.blog.163.com/blog/static/114522435200971822334475/
通过集成JOTM，直接在Spring中使用JTA事务
JOTM(Java Open Transaction Manager)是ObjectWeb的一个开源JTA实现，它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 2.0附带的依赖类库中虽然包含jotm类库，但是并不完整，你可以到http://jotm.objectweb.org下载完全版的JOTM。
Spring为JOTM提供了一个org.springframework.transaction.jta.JotmFactoryBean支持类，通过该支持类可以方便地创建JOTM本地实例。
1.将jotm的jar包lib目录下所有jar复制到项目中
2.将jotm的jar包conf目录下carol.properties文件复制到项目类路径下,修改内容为:
# 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
3.建立两个数据库，配置两个数据源
<!-- XAPool配置，内部包含了一个XA数据源，对应相应的数据库 -->
< bean id ="mysqlJta" class ="org.enhydra.jdbc.pool.StandardXAPoolDataSource" destroy-method ="shutdown" >
<!-- 内部XA数据源 -->
< 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:3309/test" />
< property name ="user" value ="root" />
< property name ="password" value ="" />
</ bean >
</ property >
< property name ="user" value ="root" />
< property name ="password" value ="" />
</ bean >
< bean id ="oracleJta" 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 ="oracle.jdbc.driver.OracleDriver" />
< property name ="url" value ="jdbc:oracle:thin:@localhost:1521:orcl" />
< property name ="user" value ="orcl" />
< property name ="password" value ="" />
</ bean >
</ property >
< property name ="user" value ="orcl" />
< property name ="password" value ="" />
</ bean >
4.事务配置
<!-- JOTM本地实例 -->
< bean id ="jotm" class ="org.springframework.transaction.jta.JotmFactoryBean" />
<!-- JTA事务管理器 -->
< bean id ="txManager" class ="org.springframework.transaction.jta.JtaTransactionManager" >
< property name ="userTransaction" ref ="jotm" />
</ bean >
<!-- JTA事务传播特性 -->
< tx:advice id ="txAdviceJta" transaction-manager ="txManager" >
< tx:attributes >
< tx:method name ="Jta*" isolation ="DEFAULT" propagation ="REQUIRED" rollback-for ="Exception" />
< tx:method name ="*" read-only ="true" />
</ tx:attributes >
</ tx:advice >
< aop:config >
< aop:advisor pointcut ="execution(* com.xxxxl.service.impl..*(..))" advice-ref ="txAdviceJta" />
</ aop:config >
< bean id ="timerDaoMysql" class ="com.xxxxl.TimerDaoImpl" scope ="prototype" >
< property name ="dataSource" ref ="mysqlJta" ></ property >
</ bean >
< bean id ="timerDaoOracle" class ="com.xxxxl.TimerDaoImpl" scope ="prototype" >
< property name ="dataSource" ref ="oracleJta" ></ property >
</ bean >
二.以下介绍Spring中直接集成Atomikos提供JTA事务管理、将Atomikos集成到Tomcat中。(经过测试推荐此方法)
Atomikos Transactions Essentials现在的版本是3.1.7,可以在http://www.atomikos.com/Main/TransactionsEssentialsDownloadForm 下载，在发布包里的examples文件夹下面有些例子，非常实用，我在使用中参考里面的例子很容易配置成功。1.将Atomikos的jar包dist目录下所有jar复制到项目中
2.建立两个数据库，配置两个数据源。
Atomikos数据源配置方法有三种分别有：SimpleDataSourceBean,AtomikosDataSourceBean,AtomikosNonXADataSourceBean可任选一种
Simple表示基础数据库连接配置
< bean id ="oracleJta" class ="com.atomikos.jdbc.SimpleDataSourceBean" init-method ="init" destroy-method ="close" >
< property name ="uniqueResourceName" >
< value > OracleXADataSource </ value > <!-- 任意命名，但必须唯一 -->
</ property >
< property name ="xaDataSourceClassName" >
< value > oracle.jdbc.xa.client.OracleXADataSource </ value >
</ property >
< property name ="xaDataSourceProperties" >
< value > URL=jdbc:oracle:thin:@localhost:1521:orcl;user=orcl;password= </ value >
</ property >
< property name ="exclusiveConnectionMode" >
< value > true </ value >
</ property >
< property name ="connectionPoolSize" >
< value > 3 </ value >
</ property >
< property name ="validatingQuery" >
< value > SELECT 1 </ value >
</ property >
</ bean >
Atomikos表示必须要用到XA数据库驱动类,可设置连接池(经过测试推荐此方法)
< bean id ="oracleJta" class ="com.atomikos.jdbc.AtomikosDataSourceBean" init-method ="init" destroy-method ="close" lazy-init ="true" >
< property name ="uniqueResourceName" >
< value > OracleXADataSource </ value >
</ property >
< property name ="xaDataSourceClassName" >
< value > oracle.jdbc.xa.client.OracleXADataSource </ value >
</ property >
< property name ="xaProperties" >
< props >
< prop key ="URL" > jdbc:oracle:thin:@localhost:1521:orcl </ prop >
< prop key ="user" > orcl </ prop >
< prop key ="password" ></ prop >
</ props >
</ property >
< property name ="poolSize" >< value > 1 </ value ></ property >
< property name ="maxPoolSize" >< value > 30 </ value ></ property >
</ bean >
AtomikosNon表示必须要用到普通数据库驱动类,可设置连接池
< bean id ="oracleJta" class ="com.atomikos.jdbc.nonxa.AtomikosNonXADataSourceBean" >
< property name ="uniqueResourceName" >< value > OracleXADataSource </ value ></ property >
< property name ="user" >< value > orcl </ value ></ property >
< property name ="password" >< value ></ value ></ property >
< property name ="url" >< value > jdbc:oracle:thin:@192.168.1.217:1521:orcl </ value ></ property >
< property name ="driverClassName" >< value > oracle.jdbc.OracleDriver </ value ></ property >
< property name ="poolSize" >< value > 1 </ value ></ property >
< property name ="borrowConnectionTimeout" >< value > 60 </ value ></ property >
</ bean >
另外一个数据库在这就不在写了，设置同上只是mysql的驱动类名为：xaDataSourceClassName:com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
3.事务配置
Atomikos事务方法
< bean id ="atomikosTransactionManager"
class ="com.atomikos.icatch.jta.UserTransactionManager"
init-method ="init" destroy-method ="close" >
< property name ="forceShutdown" >
< value > true </ value >
</ property >
</ bean >
< bean id ="atomikosUserTransaction"
class ="com.atomikos.icatch.jta.UserTransactionImp" >
< property name ="transactionTimeout" value ="240" />
</ bean >
< bean id ="transactionManager"
class ="org.springframework.transaction.jta.JtaTransactionManager" >
< property name ="transactionManager" >
< ref bean ="atomikosTransactionManager" />
</ property >
< property name ="userTransaction" >
< ref bean ="atomikosUserTransaction" />
</ property >
</ bean >
接下来的代码和上例类同就不再写。另外，在实际项目中，采用了方法二，且使用了HibernateTemplate，这个该怎么配还是怎么配；在同一台机器上，配置两套及以上的应用，会报异常，这个需要把下载包中的jta.properties包含到Classpath 中，且修改如下com.atomikos.icatch.service=com.atomikos.icatch.standalone.UserTransactionServiceFactory com.atomikos.icatch.log_base_name = tmlog com.atomikos.icatch.tm_unique_name = com.atomikos.spring.jdbc.tm com.atomikos.icatch.enable_logging=falsecom.atomikos.icatch.enable_logging=false 这句话很重要。