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6.3. Accessing the Transaction Manager

Overview
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The easiest way for an application to access the Aries transaction manager inside the OSGi container is to create a bean reference to the OSGi service using either Spring XML or blueprint XML. In fact, you typically need to reference two OSGi services: the JTA transaction manager and the Spring PlatformTransactionManager. These two services access the same underlying transaction manager, but use alternative wrapper layers (see Figure 6.1, “OSGi Transaction Architecture”).

Spring XML
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In Spring XML, you can get bean references to the JTA transaction manager instance and to the Spring PlatformTransactionManager instance using the following sample code: 
<?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:osgi="http://www.springframework.org/schema/osgi"
       xsi:schemaLocation="
   http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/osgi  
       http://www.springframework.org/schema/osgi/spring-osgi.xsd    
">

    <!--
        OSGi TM Service
    -->
    <!-- access through Spring's PlatformTransactionManager -->
    <osgi:reference id="osgiPlatformTransactionManager"
                    interface="org.springframework.transaction.PlatformTransactionManager"/>
    <!-- access through JTA TransactionManager -->
    <osgi:reference id="osgiJtaTransactionManager"
                    interface="javax.transaction.TransactionManager"/>

</beans>
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Blueprint XML
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In blueprint XML, you can get bean references to the JTA transaction manager instance and to the Spring PlatformTransactionManager instance using the following sample code: 
<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0"
            default-activation="lazy">
  
    <!--
        OSGi TM Service
    -->
    <!-- access through Spring's PlatformTransactionManager -->
    <reference id="osgiPlatformTransactionManager"
               interface="org.springframework.transaction.PlatformTransactionManager"/>
    <!-- access through PlatformTransactionManager -->
    <reference id="osgiJtaTransactionManager"
               interface="javax.transaction.TransactionManager"/>

</blueprint>
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