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From "Rob S." <rsli...@home.com>
Subject RE: tomcat 4 datasource casting
Date Mon, 20 Aug 2001 22:42:05 GMT
...and the second example for my "class-not-found" document presents itself
=)

Thanks guys!

- r

> -----Original Message-----
> From: craigmcc@sfu.ca [mailto:craigmcc@sfu.ca]On Behalf Of Craig R.
> McClanahan
> Sent: Monday, August 20, 2001 6:16 PM
> To: tomcat-user@jakarta.apache.org
> Subject: Re: tomcat 4 datasource casting
>
>
> Where do you have the jdbc2_0-stdext.jar file?  I'm betting that it needs
> to be in $CATALINA_HOME/common/lib only for this to work -- because JAR
> files here are on the class loading path for both Catalina internal
> classes and web application classes.
>
> Craig
>
>
> On Mon, 20 Aug 2001 VASQUEZ_JASON@LILLY.COM wrote:
>
> > Hello all,
> >
> > I read the great message Craig McClanahan posted in the archives  (from
> > Aug 4) about how to setup and use a tomcat 4 datasource.  All
> has seemed
> > to go pretty well, but I'm having a funny problem, which I'm
> not sure is a
> > Tyrex problem, a Tomcat 4 problem or a Java education problem
> on my part
> > :).  (I'm using Tomcat 4 beta 7)
> >
> > When I try to get a DataSource from JNDI, I can retrieve a
> reference just
> > fine.  The problem is that I am having trouble casting it to a
> > javax.sql.DataSource.  It returns an instance of
> > tyrex.jdbc.xa.EnabledDataSource.  If I try to cast to
> > javax.sql.DataSource, I get a ClassCastException from the server.  I
> > looked up this class in the Tyrex API docs, and it does in fact
> implement
> > javax.sql.DataSource -- I think I should be able to cast to it
> because of
> > that.  If I work with the tyrex implementation directly, all is
> ok (i.e.,
> > calling tyrex.jdbc.xa.EnabledDataSource.getConnection()), but I
> obviously
> > won't want to care about the particular implementation in this case.
> >
> > If it helps, here is the code I'm trying to use:
> >
> > --------------------------
> > ctx = new InitialContext();
> > ds = (DataSource)ctx.lookup("java:comp/env/jdbc/lis_ds");
> > --------------------------
> >
> > That failed, so I added this for debugging:
> >
> > --------------------------
> > Object o = ctx.lookup("java:comp/env/jdbc/lis_ds");
> > if (o == null) {
> >    System.out.println("looked up a null object");
> > } else {
> >    System.out.println("o is of type: " + o.getClass().getName()); //<--
> > prints "tyrex.jdbc.xa.EnabledDataSource"
> > }
> > --------------------------
> >
> > The exceptions I get are like this:
> >
> > --------------------------
> > java.lang.ClassCastException: tyrex.jdbc.xa.EnabledDataSource
> >         at report.ReportPrefs.setDateDefaults(ReportPrefs.java:52)
> >         at report.ReportPrefs.<init>(ReportPrefs.java:16)
> >         at java.lang.Class.newInstance0(Native Method)
> >         at java.lang.Class.newInstance(Class.java:237)
> >         at java.beans.Beans.instantiate(Beans.java:207)
> >         at java.beans.Beans.instantiate(Beans.java:51)
> > ........
> > --------------------------
> >
> > Any ideas?
> >
> > Thanks,
> > Jason Vasquez
> >
>
>


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