ServletContext and ServletContextAttribute listener query

I have 2 listener classes : One that implements ServletContextListener and other that implements ServletContextAttributeLIstener.
I have put println statements in each of the implemented methods of the corresponding listener.
I am using tomcat as container.
In my deployment descriptor I have the following entry for context init parameters:
<context-param>
          <param-name>     context name     </param-name>
          <param-value>     context value     </param-value>
     </context-param>
When I start tomcat I get the below output in the console.
Jun 9, 2007 10:48:19 AM org.apache.coyote.http11.Http11BaseProtocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Jun 9, 2007 10:48:19 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 906 ms
Jun 9, 2007 10:48:19 AM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Jun 9, 2007 10:48:19 AM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.23
Jun 9, 2007 10:48:19 AM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
context initializes
attribute added:
context initializes
attribute added:
Jun 9, 2007 10:48:20 AM org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Jun 9, 2007 10:48:20 AM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Jun 9, 2007 10:48:20 AM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/47 config=null
Jun 9, 2007 10:48:20 AM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
Jun 9, 2007 10:48:20 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1108 ms
As can be seen by the bold lines, the ServletContextEvent and ServletContextAttributeEvent are fired.
I can understand the initialization part, but what about the attribute one, i havent added any attribute, yet I get the corresponding event is fired.
Also from the output it seems that the initialization takes place twice.
I wonder if the container initialized the ServletContext object with some value and also adds some attribute to it. Please let me know if this is the case.
Also, is there a way by which the attribute that was added to the context object can be obtained in the corresponding listener class. The event.getSource() returns object of ServletContext I guess.
Regards,
Joshua

Check your tnsnames.ora file, it will have an entry like
listener_facdb =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL=TCP) (HOST= danube103) (PORT=31415))
)When you create a listener on a non-default port, PMON should be able to register the database service(s) with this listener.
PMON utilises tnsentry naming method for this. PMON will look in tnsnames.ora file for the value it found in LOCAL_LISTENER.
If it doesn't find this entry in the tnsnames.ora file, it will throw error.
Alternatively, you could just use
alter system set local_listener='(ADDRESS = (PROTOCOL=TCP) (HOST= danube103) (PORT=31415))' scope = both;But this isn't very readable. Is it ?

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