I have a Maven build with the following directory structure:
/trunk
/BlahBuild
/BlahCommon
/BlahBiz
/BlahDataAccess

The parent pom.xml inside BlahBuild looks like so:
<modules>
<module>../BlahCommon</module>
<module>../BlahDataAccess</module>
<module>../BlahBiz</module>
</modules>

This works fine in Maven, but fails in Hudson. My project configuration uses the
following values:
Subversion Modules - file:///C:/svnrepo_blah/trunk
Root POM - BlahBuild/pom.xml

Console output for BlahBiz:
started
ERROR: No POM: C:\Documents and
Settings\mike\.hudson\jobs\Blah\workspace\trunk\..\BlahBiz\pom.xml
finished: FAILURE

Tomcat output:
Mar 4, 2007 4:34:57 PM hudson.model.Run setResult
INFO: Blah #25 : result is set to SUCCESS by hudson.model.Run.run(Run.java:533)
Mar 4, 2007 4:34:57 PM hudson.model.Run run
INFO: Blah #25 main build action completed: SUCCESS
Mar 4, 2007 4:35:04 PM hudson.model.Run setResult
INFO: blah:blah-maven-build #25 : result is set to SUCCESS by
hudson.model.Run.run(Run.java:533)
Mar 4, 2007 4:35:04 PM hudson.model.Run run
INFO: blah:blah-maven-build #25 main build action completed: SUCCESS
Mar 4, 2007 4:35:10 PM hudson.model.Run setResult
INFO: Blah:blah-biz #25 : result is set to FAILURE by
hudson.model.Run.run(Run.java:533)
Mar 4, 2007 4:35:10 PM hudson.model.Run run
INFO: Blah:blah-biz #25 main build action completed: FAILURE
Mar 4, 2007 4:35:10 PM hudson.model.Run setResult
INFO: Blah:blah-common #25 : result is set to FAILURE by
hudson.model.Run.run(Run.java:533)
Mar 4, 2007 4:35:10 PM hudson.model.Run run
INFO: Blah:blah-common #25 main build action completed: FAILURE
Mar 4, 2007 4:35:10 PM hudson.model.Run setResult
INFO: Blah:blah-data-access #25 : result is set to FAILURE by
hudson.model.Run.run(Run.java:533)
Mar 4, 2007 4:35:10 PM hudson.model.Run run
INFO: Blah:blah-data-access #25 main build action completed: FAILURE

In short, it looks like the ../ isn't accounted-for. I can work around this by
placing a modified pom.xml in the trunk directory.