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