Diego Louzán wrote:

The last couple of days I've been learning about SLF4J and Logback. IMHO this is a great piece of software.

Thanks.

One of my needs was to configure logging to a JNDI shared database inside tomcat 5.5. I followed the directions outlined in http://logback.qos.ch/manual/appenders.html for configuring the DBAppender with a JNDIConnectionSource.

The example code in the manual is like this:

<connectionSource class="ch.qos.logback.core.db.JNDIConnectionSource"> <param name="jndiLocation" value="jdbc/MySQLDS" /> <param name="username" value="myUser" /> <param name="password" value="myPassword" /> </connectionSource>

(BTW, the "username" param in the documentation is wrong, it must be "user").

If it's not too much to ask, could you please enter a bug report regarding this problem? Actually, you might want to reference this whole thread as from what I could understand, there are multiple issues involved. [snip]

As you can see, tomcat references a JCL logger in "org.apache.catalina.core.ContainerBase.getLogger" just when first loading the webapp. This triggers logback initialization, and when the JNDIConnectionSource tries to get a reference to the DataSource, it finds nothing.

Interesting problem. One way to solve it would be to perform logback configuration in two stages. In the first stage, you would configure logback as usual, using logback.xml. In the second, you would use another config file, say logback-db.xml and invoke Joran after tomcat has been initialized. Here is sample code: LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory(); URL url = Loader.getResource("logback-db.xml", classLoader); JoranConfigurator configurator = new JoranConfigurator(); LoggerContext loggerContext = () configurator.setContext(lc); configurator.doConfigure(url);

I found a reference to a similar problem with JNDI contexts in the old bugzilla tracker (http://marc.info/?l=logback-dev&m=119005116732589&w=2) but although I tried locating this bug report in the new JIRA tracker I could not find it. Maybe it got lost during the migration?

It's here: http://jira.qos.ch/browse/LBCLASSIC-30 I found it by going to jira.qos.ch, FIND ISSUES and entering 96 as the bugzilla id to search for (at the bottom of the page). Entering "ContextSelectors" as the query text also yields valid results. So, it looks like the migration was OK.

At the moment I'm still trying to fully understand the codebase. Do you figure out any solution to the problem?

See above.

I'm sorry for such a lengthy message. Hope this info helps the project. Regards and keep up the good work.

Thanks,

Diego.

-- Ceki Gülcü QOS.ch is looking to hire talented developers located in Switzerland to work on cutting-edge software projects. If you think you are qualified, then please contact ceki@qos.ch.