Re: Why tomcat 6.0.18 looks for MySQL JDBC driver to be placed in CATALINA_HOME/lib folder?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Ramesh, peterramesh wrote: On reading Tomcat help doc http://tomcat.apache.org/tomcat-6.0-doc/jndi-resources-howto.html, it recommends to place the MySQL JDBC driver in both places (CATALINA_HOME/lib and WEB-INF/lib folder of the app). I don't think so. The only place on that page where WEB-INF/lib is referenced is here (as application's lib folder): Note: placing these jars in both $CATALINA_HOME/lib and a web application's lib folder will cause an error, so ensure you have them in the $CATALINA_HOME/lib location only. Putting your JDBC driver in both place is a recipe for pain. 1. Why Tomcat look for the JDBC jar to be in CATALINA_HOME/lib folder? Tomcat creates the JNDI DataSource and loads your driver outside of the webapp's ClassLoader. I'm not sure why it does this, but it does. That requires you to make your driver available to Tomcat in CATALINA_HOME/lib. 2. If I copied more than one JDBC jars (with different version) in CATALINA_HOME/lib folder for couple of my applications, how each of them looks for the respective versions of JDBC driver? They can't. It'll be completely random which version of the driver wins. If you /need/ different JDBC driver versions for the same database, then you are better off with separate Tomcat instances. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkmLa08ACgkQ9CaO5/Lv0PBFYwCfQOFXsDx64Vfpv/2W8nd+cF4N zqsAnjVkrMEclBYZ0uZRxRpLjthoL1QE =WQ7/ -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Why tomcat 6.0.18 looks for MySQL JDBC driver to be placed in CATALINA_HOME/lib folder?
Hi Kees, Yes. Since, I'm using the JNDO datasource the JDBC driver need to be in $CATALINA_HOME, becase 'common' class loader looks for the JDBC driver (it may be invoked by tomcat-dbcp.jar). Ramesh Kees de Kooter wrote: Hi Ramesh, Did you configure a JNDI datasource in tomcat? In that case the datasource exists outside your app. Cheers, Kees de Kooter http://www.boplicity.net On Mon, Feb 2, 2009 at 13:06, peterramesh ramesh.ramas...@gmail.com wrote: Hi, On reading Tomcat help doc http://tomcat.apache.org/tomcat-6.0-doc/jndi-resources-howto.html, it recommends to place the MySQL JDBC driver in both places (CATALINA_HOME/lib and WEB-INF/lib folder of the app). If I haven't placed in CATALINA_HOME/lib folder, my app is failing with driver not found error. I'm puzzled with.. 1. Why Tomcat look for the JDBC jar to be in CATALINA_HOME/lib folder? 2. If I copied more than one JDBC jars (with different version) in CATALINA_HOME/lib folder for couple of my applications, how each of them looks for the respective versions of JDBC driver? Thanks, Ramesh -- View this message in context: http://www.nabble.com/Why-tomcat-6.0.18-looks-for-MySQL-JDBC-driver-to-be-placed-in-CATALINA_HOME-lib-folder--tp21788529p21788529.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- View this message in context: http://www.nabble.com/Why-tomcat-6.0.18-looks-for-MySQL-JDBC-driver-to-be-placed-in-CATALINA_HOME-lib-folder--tp21788529p21830890.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Why tomcat 6.0.18 looks for MySQL JDBC driver to be placed in CATALINA_HOME/lib folder?
Hi Gregor, Why should your webapps require different versions of the same JDBC-driver? Do you have different instance of MySQL running? If not, IMHO that doesn't make any sense at all. Thanks for your reply, this make me understood that Tomcat server just need a JDBC driver (single version) for a MySQL instance, and it shall support JNDI datasource for the web apps deployed in that Tomcat instance. Thanks and Regards, Ramesh -- View this message in context: http://www.nabble.com/Why-tomcat-6.0.18-looks-for-MySQL-JDBC-driver-to-be-placed-in-CATALINA_HOME-lib-folder--tp21788529p21830995.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Why tomcat 6.0.18 looks for MySQL JDBC driver to be placed in CATALINA_HOME/lib folder?
Hi, On reading Tomcat help doc http://tomcat.apache.org/tomcat-6.0-doc/jndi-resources-howto.html, it recommends to place the MySQL JDBC driver in both places (CATALINA_HOME/lib and WEB-INF/lib folder of the app). If I haven't placed in CATALINA_HOME/lib folder, my app is failing with driver not found error. I'm puzzled with.. 1. Why Tomcat look for the JDBC jar to be in CATALINA_HOME/lib folder? 2. If I copied more than one JDBC jars (with different version) in CATALINA_HOME/lib folder for couple of my applications, how each of them looks for the respective versions of JDBC driver? Thanks, Ramesh -- View this message in context: http://www.nabble.com/Why-tomcat-6.0.18-looks-for-MySQL-JDBC-driver-to-be-placed-in-CATALINA_HOME-lib-folder--tp21788529p21788529.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Why tomcat 6.0.18 looks for MySQL JDBC driver to be placed in CATALINA_HOME/lib folder?
Hi Ramesh, Did you configure a JNDI datasource in tomcat? In that case the datasource exists outside your app. Cheers, Kees de Kooter http://www.boplicity.net On Mon, Feb 2, 2009 at 13:06, peterramesh ramesh.ramas...@gmail.com wrote: Hi, On reading Tomcat help doc http://tomcat.apache.org/tomcat-6.0-doc/jndi-resources-howto.html, it recommends to place the MySQL JDBC driver in both places (CATALINA_HOME/lib and WEB-INF/lib folder of the app). If I haven't placed in CATALINA_HOME/lib folder, my app is failing with driver not found error. I'm puzzled with.. 1. Why Tomcat look for the JDBC jar to be in CATALINA_HOME/lib folder? 2. If I copied more than one JDBC jars (with different version) in CATALINA_HOME/lib folder for couple of my applications, how each of them looks for the respective versions of JDBC driver? Thanks, Ramesh -- View this message in context: http://www.nabble.com/Why-tomcat-6.0.18-looks-for-MySQL-JDBC-driver-to-be-placed-in-CATALINA_HOME-lib-folder--tp21788529p21788529.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Why tomcat 6.0.18 looks for MySQL JDBC driver to be placed in CATALINA_HOME/lib folder?
Within the docs I do not see a recommendation to place the JDBC-driver
both in ${CATALIN_HOME}/lib *AND* WEB-INF:
==
1. Install Your JDBC Driver
Use of the JDBC Data Sources JNDI Resource Factory requires that you
make an appropriate JDBC driver available to both Tomcat internal
classes and to your web application. This is most easily accomplished
by installing the driver's JAR file(s) into the $CATALINA_HOME/lib
directory, which makes the driver available both to the resource
factory and to your application.
===
2. If I copied more than one JDBC jars (with different version) in
CATALINA_HOME/lib folder for couple of my applications, how each of them
looks for the respective versions of JDBC driver?
I'd reconsider my webapps preferabbly:
Why should your webapps require different versions of the same
JDBC-driver? Do you have different instance of MySQL running?
If not, IMHO that doesn't make any sense at all.
Rgds
Gregor
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