Issue in Oracle 11g Database Change Notification for Java application

Hi,
I am trying to use Oracle's Database Change Notification in Java application.
I followed the sample application (+DBChangeNotification.java+ , Example 29-2), provided in the following link:
+[http://download.oracle.com/docs/cd/B28359_01/java.111/b31224/dbmgmnt.htm#CHDEJECF]+
I am able to see that the Registration of the SQL query is successful.
But, when I do changes to the table registered, notifications are not received in the Listener class (+DCNDemoListener.java+).
Ideally, the method DCNDemoListener.onDatabaseChangeNotification() should be invoked on any insert/update to the registered table. But this method is not getting invoked.
The execution has stopped in the following line of DBChangeNotification.java Class.
this.wait();
+==> The application was WAITing indefinitely in this line, as the NOTIFY() from DCNDemoListener.java was not executed.+
I am using VPN to connect to Oracel server. Remote Oracle Server is protected my firewall. Is this the reason for not sending the notifications from Oracle server?
The version of software used are given below:
Oracle Client - Oracle 11.1.0
JDK - 1.6
Oracle JDBC Driver - ojdbc6.jar
Can someone help me to resolve this issue?
Thanks in Advance.
Regards
Sam
Edited by: Ponsu on Apr 7, 2011 10:41 PM

Hi,
I am having similar issue. Where you able to resolve it.
I am also using the same example you were using.
I am using the following version.
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
Compatibility: 11.2.0.0.0
I do not see any notification coming back from the DB.
Appreciate your help.
Thanks & regards,
Ebe

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>
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