helpful somewhat... at least in helping me narrow my question. So what is this "java:comp/env"? What exactly is being returned based on this string passed to lookup()?
Eric On Sat, 06 Nov 2004 23:35:34 -0500, Frank W. Zammetti <[EMAIL PROTECTED]> wrote: > I'll give it a shot... > > All JNDI resource lookups occur relative to some context. The code you > posted first gets the default initial context, then looks for a resource > named "java:comp/env" relative to that default context. It then gets a > reference to a DataSource that exists within the context "jdbc/wms" > relative to "java:comp/env" > > You can ROUGHLY think of this the same way you do URLs... in a sense, > the "java:comp/env" might be something like www.apache.org. That gives > you a starting context. Then if you want to retrieve a particular file > in that domain, you look it up relative to the domain (i.e., > www.apache.org/tomcat.htm). > > Same thing here... There is a hierarchy of JNDI resources, a tree > structure, that has an initial context as the root. You then are in a > sense constructing a path to your DataSource, and it might look > something like /initial_context/java:comp/env/jdbc/wms (not exactly, but > you get the idea). > > Does that help any? > > -- > Frank W. Zammetti > Founder and Chief Software Architect > Omnytex Technologies > http://www.omnytex.com > > > > Eric Wulff wrote: > > I just returned from working on a tutorial at sun which I was inspired > > to go over based on my lack of understanding of the code snippet > > below. I'm trying to fully understand what's going on. Docs state > > that the code... > > > > initialContext.lookup("java:comp/env") > > > > returns a named object. Best I can tell is that this is a reference > > to a starting point in my directory... or something like that. Is > > anyone willing to explain what initialContext.lookup() fundamentally > > takes care of when called? > > > > Context initialContext = new InitialContext(); > > Context context = (Context) initialContext.lookup("java:comp/env"); > > DataSource dataSource = (DataSource) context.lookup("jdbc/wms"); > > > > thx > > Eric > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > . > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
