can't run ultra search sample application

Hi all,
I 've setup Oracle Ultra Search (with application server 9i R2) on a Win2k.
I run the crawler, but when I invoke the sample query application, 
specifically /ultrasearch/query/usearch.jsp,
I get the message
<i>Connection to the database could not be established. Please check the 
url setting for jdbc/UltraSearchPooledDS data source in your J2EE 
container. If the container is OC4J, this information is in the data-
sources.xml file.</i>
The exception is 
<i>oracle.ultrasearch.query.SearchException: WKG17005: connection failure: 
ORA-01017: invalid username/password; logon denied</i>.
But, the jdbc/UltraSearchPooledDS data source is defined in my 
datasources.xml file (with the correct username and jdbc_url I suppose).
Has anyone faced the same problem, or has a hint to give me?

Thanx in advance
Lambros
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