Woohoo! I got it to work. Just in case somebody wants to know how...
(I'm running the 'default' JBoss configuration.)
1. copy archiva-webapp/src/main/webapp/WEB-INF/lib/derby-10.1.3.1.jar
into $JBOSS_HOME/server/default/lib;
2. create $JBOSS_HOME/server/default/deploy/derby-ds.xml
<?xml version="1.0" encoding="UTF-8"?>
<datasources>
<local-tx-datasource>
<!-- The jndi name of the DataSource, it is prefixed with java:/ -->
<!-- Datasources are not available outside the virtual machine -->
<jndi-name>users</jndi-name>
<!-- for in-process persistent db, saved when jboss stops. The
org.jboss.jdbc.DerbyDatabase mbean is necessary for properly db
shutdown -->
<connection-url>jdbc:derby:database/archiva;create=true</connection-url>
<!-- The driver class -->
<driver-class>org.apache.derby.jdbc.EmbeddedDriver</driver-class>
<!-- The login and password -->
<user-name>sa</user-name>
<password></password>
<!-- The minimum connections in a pool/sub-pool. Pools are
lazily constructed on first use -->
<min-pool-size>5</min-pool-size>
<!-- The maximum connections in a pool/sub-pool -->
<max-pool-size>20</max-pool-size>
<!-- The time before an unused connection is destroyed -->
<idle-timeout-minutes>5</idle-timeout-minutes>
<!-- Whether to check all statements are closed when the
connection is returned to the pool,
this is a debugging feature that should be turned off in
production -->
<track-statements/>
</local-tx-datasource>
</datasources>
3. edit archiva-webapp/src/main/webapp/WEB-INF/web.xml and add
<resource-ref>
<res-ref-name>jdbc/users</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
(somewhere between <web-app> and </web-app>);
4. create archiva-webapp/src/main/webapp/WEB-INF/jboss-web.xml
<?xml version="1.0" encoding="UTF-8"?>
<jboss-web>
<resource-ref>
<res-ref-name>jdbc/users</res-ref-name>
<jndi-name>java:/users</jndi-name>
</resource-ref>
</jboss-web>
5. rerun 'mvn install' (to update the WAR with the updated web.xml and
jboss-web.xml);
6. deploy the new WAR and Archiva should work.
DISCLAIMER: I'm not, by any stretch of the word, an expert on JBoss so
this is probably not the *best* way to do it ... but it works. :-)
