Hi Diego, Diego> prepended by "java:comp/env", as this is the standard context for java Diego> objects and the JNDIConnectionSource does not prepend the searched values with it. Anton> Looks like a nice idea to me. Anton> Will not be backwards compatible but logback is not version 1 yet. Diego> In my company we have our own DataSourceLocator class that abstracts the Diego> JNDI lookup and automagically prepends all searched keys with Diego> "java:comp/env" but this is obviously custom behaviour. Diego> There are two options here: document the need for the prefix in the Diego> manual or add the prefix to all keys in the JNDIConnectionSource class. Diego> I'd suggest the former option as the best one Could you please create a Jira item for this? Don't worry, if it's deemed a bad idea the item shall be simply closed as 'WONT FIX'. Diego> Another thing I got problems with was slf4j's jcl-over-slf4j-1.5.2.jar. Diego> logback ... initialized too early when using jcl-over-slf4j, before tomcat Diego> makes the JNDI resources available to the web application Diego> ch.qos.logback.core.db.JNDIConnectionSource@67c1a6 - Error while getting Diego> data source javax.naming.NameNotFoundException: Diego> javax.naming.NameNotFoundException: 'comp' can't be found in this context Diego> at org.apache.naming.NamingContext.lookup(NamingContext.java:770) Diego> ... Diego> org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155) Diego> org.apache.commons.logging.LogFactory.getLog(LogFactory.java:704) Diego> org.apache.catalina.core.ContainerBase.getLogger(ContainerBase.java:381) Diego> ... Diego> org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149) Anton> Looks pretty weird to me. Diego what folder is jcl-over-slf4j-1.5.2.jar in? Anton> Do you have another copy in shared tomcat libraries? Or together with tomcat own jars? Diego> I tested including jcl-over-slf4j in both the webapp WEB-INF/lib dir and Diego> in global tomcat common/lib. Got the same error both times. Diego, could you please try this WITHOUT jcl-over-slf4j in common/lib? 99.99% probability that it's the root of the problem. Cheers, Anton