Hello
For some time now I have implemented the Tomcat 'JNDI DataSource' How-To on
connection pooling, and everything has been fine.
I define a resource in the context fragment:
<Resource name="jdbc/postgres"
auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/postgres">
...
</ResourceParams>
And a resource reference to it in the deployment descriptor:
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/postgres</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
And then do a JNDI lookup at runtime:
return ( DataSource )new InitialContext().
lookup( "java:comp/env/jdbc/postgres" );
Magic.
The other day I noticed that the resource reference in my deployment
descriptor was actually broken - the name did not match that defined in the
context - and yet my application was still working - perfectly.
When I thought about it, it occurred to me that the resource reference in
the deployment descriptor may not actually be necessary.
So I deleted the resource reference from the web.xml file, and everything
still works as expected.
Can anyone enlighten me?
Many thanks in anticipation.
Harry Mantheakis
London, UK
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