Thanks for reply, my db is Oracle 9i
The problem isn't a security or driver problem, I have tested also in
the same tomcat, in webapps:
- Cpying the unpacked version only, modify context and web.xml, all
works perfectly.
- Removing in the same tomcat the application, copying the war file and
modify context.xml and web.xml in the unpacked directory, I have the

org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot
create JDBC driver of class '' for connect URL 'null'


- Removing the war and copying the unpacked version only, modify context
and web.xml, all works perfectly.

I have tested tomcat 5.5.20 5.5.17 many times and on several tomcat
instance, I have always the same behavior.

In my case using war deployment prevent me to update manually
context.xml to add datasource. I need to use admin webapp or to copy
unpacked directory, not the war himself.

Arnaud

David Delbecq a ?crit :
> Get the full stacktrace of exception to know when this happen. If both
> install are same, maybe one is on a server that has no access to the db
> (check the db security settings).
>
> Also, what did you compare with windiff? The webapp directories or the
> full tomcat install directores? Your META-INF/context.xml should have
> been copied by tomcat to conf/Catalina/<hostname>/<webappname>.xml Check
> those are correct.
>
>
> En l'instant pr?cis du 01/08/07 12:07, Arnaud MERGEY s'exprimait dans
> toute sa noblesse:
>  
>> Hi
>> something strange appends with an application
>> On tomcat 5.5.20 (same behavior with tomcat 5.5.17)
>>
>> I deploy an application copying an unpacked war directory into webapps
>> directory. I add a datasource updating the META-INF/context.xml and
>> WEB-INF/web.xml like tomcat how-to. All works perfectly, no problems.
>>
>> In another tomcat I copy the war of the same application in the
>> webapps, the war is unpacked . I add the datasource updating the
>> META-INF/context.xml and WEB-INF/web.xml and I can't use this
>> datasource : "org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot
>> create JDBC driver of class '' for connect URL 'null'"
>>
>> witth windiff I compare the two directory and they are identical, the
>> only differences is in one the webapps directry has only the unpacked
>> directory and the other has unpacked and war directory.
>>
>> I need help to understand, thanks
>> Arnaud
>>
>>
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>
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