About Tomcat combined with Atomikos to implement JTA

 Using JTA in Tomcat, you can deploy Atomikos in Tomcat and use the data source supported by Tomcat; you can also configure it in the project and use Spring to configure the data source, connection pool, transaction manager, etc. The two methods have their own characteristics. This article only introduces the integration of Tomcat and Atomikos. After the integration, Tomcat can provide JTA transaction manager and data source to the outside world.

         Before using Atomikos, we also used JOTM, but under high concurrency conditions, JOTM frequently failed and we had to give up. Through testing, we found that Atomikos had good performance and stability.

         We used the latest version 4.04 of Atomikos. The Jar package can be obtained from the Maven configuration library. The link address is: http://mvnrepository.com/artifact/com.atomikos

If you do not use Hibernate, the required packages include:

atomikos-util.jar,
jta.jar,
transactions.jar,
transactions-api.jar,
transactions-jdbc.jar,
transactions-jta.jar

Integration Package:
atomikos-integration-extension-3.7.2.jar

Remember to put the database driver

 <Resource name="jdbc/DS_MYSQL"

            auth="Container"

            type="com.atomikos.jdbc.AtomikosDataSourceBean"

            uniqueResourceName="jdbc/DS_MYSQL"

            xaDataSourceClassName="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource"

            xaProperties.databaseName="db_test"

            xaProperties.serverName="localhost"

            xaProperties.port="3306"

            xaProperties.user="root"

            xaProperties.password="root"

            maxPoolSize="200"

            xaProperties.url="jdbc:mysql://localhost:3306/db_test?characterEncoding=UTF8"

            factory="com.atomikos.tomcat.EnhancedTomcatAtomikosBeanFactory" />

  <Resource name="UserTransaction"

            auth="Container"

            type="javax.transaction.UserTransaction" />   

   <Transaction factory="com.atomikos.icatch.jta.UserTransactionFactory" />

<!-- JNDI template configuration information, used to connect to the application server -->

<bean class="org.springframework.jndi.JndiTemplate" id="jndiTemplate" />
<bean class="org.springframework.jndi.JndiObjectFactoryBean" id="dataSource">

    <property name="jndiName">

        <value>java:comp/env/jdbc/DS_MYSQL</value>

    </property>

    <property name="jndiTemplate">

        <ref bean="jndiTemplate"/>

    </property>

</bean>

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

    <property name="dataSource">

        <ref bean="dataSource" />

    </property>

</bean>  

<!--User transaction object-->

<bean class="org.springframework.jndi.JndiObjectFactoryBean" id="userTransaction">

    <!--class="org.springframework.transaction.jta.WebLogicJtaTransactionManager">-->

    <property name="jndiName">

        <value>java:comp/UserTransaction</value>

    </property>

    <property name="jndiTemplate">

        <ref bean="jndiTemplate"/>

    </property>

</bean>

<bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager"

    init-method="init" destroy-method="close">

    <property name="forceShutdown" value="false" />

</bean>

<!-- Configure annotation-based declarative transaction manager -->

<bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">

    <property name="userTransaction" ref="userTransaction" />

    <property name="transactionManager" ref="atomikosTransactionManager" />

</bean> 

<tx:annotation-driven transaction-manager="transactionManager" />

 auth="Container"
    type="com.atomikos.jdbc.nonxa.AtomikosNonXADataSourceBean"

        uniqueResourceName="jdbc/DS_MYSQL"

        driverClassName="com.mysql.jdbc.Driver"

        maxPoolSize="200"

        url="jdbc:mysql://localhost:3306/db_test?characterEncoding=UTF8"

        user="root"

        password="root"

        factory="com.atomikos.tomcat.EnhancedTomcatAtomikosBeanFactory" />

 <Resource name="UserTransaction"

            auth="Container"
type="com.atomikos.icatch.jta.userTransactionImp"/>   

   <Transaction factory="com.atomikos.icatch.jta.UserTransactionFactory" />