5 Replies Latest reply on Dec 17, 2007 5:18 AM by Antonio Broughton

    Multiple database JNDI calls in single EJB

    Antonio Broughton Newbie

      Hi,

      I have some code in an EJB that I want to open up two different database connections (using JNDI) to two different datasources... so...

      Context loContext = (Context) new InitialContext().lookup("java:");
      DataSource loDataSource1 = (DataSource)loContext.lookup("Prophet_Data");
      Connection loConnection1 = loDataSource1.getConnection();
      try {
       DataSource loDataSource2 = (DataSource)loContext.lookup("Prophet_Cube");
       // Issue when this getConnection() is called
       Connection loConnection2 = loDataSource2.getConnection();
       try {
       //
       } finally {
       if (!(loConnection2 == null)) {
       loConnection2.close();
       }
       }
      } finally {
       if (!(loConnection1 == null)) {
       loConnection1.close();
       }
      }
      


      When I call loDataSource2.getConnection(), the following exception is raised:
      11:21:35,475 WARN [loggerI18N] [com.arjuna.ats.internal.jta.transaction.arjunacore.lastResource.disallow] [com.arjuna.ats.internal.jta.transaction.arjunacore.lastResource.disallow] Adding multiple last resources is disallowed. Current resource is org.jboss.resource.connectionmanager.TxConnectionManager$LocalXAResource@1b6ac25
      11:21:35,476 ERROR [STDERR] org.jboss.util.NestedSQLException: Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: a090101:c463:47658705:2467 status: ActionStatus.ABORT_ONLY >); - nested throwable: (org.jboss.resource.JBossResourceException: Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: a090101:c463:47658705:2467 status: ActionStatus.ABORT_ONLY >))
      11:21:35,477 ERROR [STDERR] at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:94)
      11:21:35,478 ERROR [STDERR] at nz.co.mcpond.test.ejb.helloejb.HelloEJB.getText(HelloEJB.java:23)
      11:21:35,478 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      11:21:35,478 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)


      If I set com.arjuna.ats.jta.allowMultipleLastResources to true, within jbossjta-properties.xml, then I can use the second connection, however, I have read that this is not really safe to do so.

      So, I am just wondering, what is the best way to use two seperate database connections within the same EJB (using JNDI)?

      I am using two seperate database connections, because I want to read data from both databases (and update both databases) depending on values from each table within each database...

      Antonio Broughton