[jboss-user] [JNDI/Naming/Network] - Multiple database JNDI calls in single EJB

anacarda do-not-reply at jboss.com
Sun Dec 16 17:33:35 EST 2007


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 at 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

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