1 Reply Latest reply: Dec 19, 2011 11:31 AM by Michael Musgrove RSS

    Distributed transaction

    Amar Das Newbie

      All:

       

      Does anyone have an example of connecting to two databases using JPA (2 persistence.xml) and performing a XA transaction?

       

      Thanks

        • 1. Re: Distributed transaction
          Michael Musgrove Master

          I don't have a ready made example but to get you started you will need something along the following lines:

           

                  <persistence-unit name="pctx1">

                          <jta-data-source>java:jboss/datasources/ExampleDS</jta-data-source>

                          <properties>

                            <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver" />

                            <property name="hibernate.connection.url" value="jdbc:h2:mem:test1" />

                            <property name="hibernate.connection.username" value="sa" />

                            <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect" />

                            <property name="hibernate.hbm2ddl.auto" value="create" />

                            ....

                          </properties>

                  </persistence-unit>

                  <persistence-unit name="pctx2">

                          <jta-data-source>java:jboss/datasources/ExampleDS2</jta-data-source>

                          <properties>

                          ... etc

           

          in your persistence.xml where you have configured java:jboss/datasources/ExampleDS and java:jboss/datasources/ExampleDS2 as xa datasources in your XML config

           

          followed by

           

          public class XAService {

             @PersistenceContext(unitName = "pctx1")

             EntityManager em1;

             @PersistenceContext(unitName = "pctx2")

             EntityManager em2;

           

             public void doXA() {

                UserTransaction ut = (UserTransaction) new InitialContext().lookup("java:comp/UserTransaction");

                ut.begin();

                em1.persist(new Entity1("E1"));

                em2.persist(new Entity2("E2"));

                ut.commit();

             }