title: java oracle database change notification
body: <p>I have one application deployed on Red Hat Linux and Oracle 12c. </p>
  
  <p>As part of the application, there is an implementation of Oracle Database Change Notification. Whenever there is a change in the database, that triggers a notification back to the application server. Based on that, the application makes some decisions. Here everything is working well.</p>
  
  <p>Now we are migrating application to amazon EC2 instance with our Red Hat Linux box converted into an EC2 instance and the Oracle Database migrated to cloud. I don’t know what that means, but I do have connection parameters and I'm able to connect though the JDBC driver from my application deployed in the EC2 instance.</p>
  
  <p>Somehow the database change notification functionality is not working in EC2and nothing can be tracked from the application log.</p>