Maybe you have more than one copy of DataSource loaded somehow? I'd put some logging in to investigate the superclasses and classloaders of what you look up and the classloader of DataSource.

Hi,
I am newbie to Jboss.I am using jboss-3.2.0_tomcat-4.1.24. I got the same exception.I am not using any struts.jar..I am running with default jboss config.
I created OracleDS Pool as define in examples jca.

in the web.xml the following config:
<resource-ref>
Oracle Datasource example
<res-ref-name>jdbc/myoracle</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>

In the jsp I am using the following code:
Context ctx = new InitialContext();
if(ctx == null )
throw new Exception("- No Context");

Context envContext = (Context)ctx.lookup("java:OracleDS");
DataSource ds = (DataSource)envContext.lookup("jdbc/myoracle");



Am I doing something wrong?
Please reply.
thanks.

my mistake.
it is working ok now.
sorry.
Context ctx = new InitialContext();
DataSource ds= (DataSource)ctx.lookup("java:/OracleDS");

Connection conn = ds.getConnection();