Can't get an instance of ConnectionPoolManager

Question

I am trying to share the database connection pool across not only app modules but some of our pages that need to connect to the db but do not have app modules on them. But when I try to get the ConnectionPoolManager instance, it fails (UNLESS a page with an app module on it was loaded first). If I try to get the instance first I get a nullpointer exception. Important note: I am in my own connection wrapper class so I do not have a session or pageContext.
I do this in my static initializer block of my class:
poolManager = ConnectionPoolManagerFactory.getConnectionPoolManager();
(this throws a null pointer exception)
and I've traced the error to this line in the ConnectionPoolManagerFactory getting null back:
String s = PropertyMetadata.PN_POOL_MANAGER.getProperty();
I suspect it is because the oracle.jbo.PropertyManager.loadProperties has not been run yet. The javadocs says: "This class is used at framework initialization time to choose values for the various properties".
So, my questions are:
1) How can I initialize the framework from my bean that is not tied to a session?
2) If I have to invoke an app mod instance to make this work....is there a simple way to create a dummy app mod instance from a bean that is not tied to a session?

Answer 1

Hi,
As you have figured out the ConnectionPoolManagerFactory was intended for use by the BC4J RT only -- it has never been
tested for use by an Object external to the oracle.jbo.server package. That said, I can see the value in maintaining a single
connection pool across BC4J and non-BC4J applications. I was able to workaround the exception reported above using the 9.0.3
preview release with the following test procedure:
System.setProperty(
PropertyMetadata.PN_POOL_MANAGER.pName
, PropertyMetadata.PN_POOL_MANAGER.pDefault);
try
Class.forName("oracle.jdbc.driver.OracleDriver");
catch (Exception e)
ConnectionPoolManager mgr = ConnectionPoolManagerFactory.getConnectionPoolManager();
String poolKey = mgr.generatePoolKey("jdbc:oracle:thin:scott/tiger@localhost:1521:ORCL", null);
Connection conn = mgr.getConnection(
poolKey
, "jdbc:oracle:thin:scott/tiger@localhost:1521:ORCL"
, null
, null
, null);
if (conn != null)
System.out.println("success");
mgr.returnConnection(poolKey, conn);
Please note the first line that adds the ConnectionPoolManagerImpl classname to the System properties. Please note that this
property could also be specified at the command line with a VM parameter:
-Djbo.ConnectionPoolManager=oracle.jbo.server.ConnectionPoolManagerImpl
I have filed an enhancement request for this use case and will provided better support in 9.0.4.
Hope this helps.
JR