Confluence on Tomcat can't start app

I'm trying to get Confluence wiki running on my Debian box inside Tomcat. Now, I've never used Tomcat before so I really don't understand a lot of it. Here's my setup:

Debian Lenny 5.0
Tomcat 5.5.26-5
Open jdk openjdk-6-jre

all installed with apt

Tomcat itself works and I can view the admin and manager screens, but when I try to start the confluence app, the logs say:

Oct 6, 2009 1:00:00 AM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Oct 6, 2009 1:00:00 AM org.apache.catalina.core.StandardContext start
SEVERE: Context [/confluence] startup failed due to previous errors

Great help :(

I have in my /var/lib/tomcat5.5/conf/Catalina/localhost directory a file named confluence.xml with the following

<Context path="/confluence" docBase="/usr/share/tomcat5.5/atlassian/confluence-3.0.1/confluence" debug="0" reloadable="true">
</Context>

and the confluence dir as specified in that context. Tomcat sees it in the manager, but can't start it.
My server.xml contains the following connector:

<Connector port="8080" maxHttpHeaderSize="8192"
           maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
           enableLookups="false" redirectPort="8443" acceptCount="100"
           connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="UTF-8" />

Which I think is pretty standard. My question is, why can't I see any more info in the logs? How can I get a more specific logging for this app. The Tomcat docs say that a Logger directive inside this context is no longer valid. but telling me "because of previous errors" doesn't really help. Also, if anyone has any tips on setting up Confluence, I'm all ears