Hello,
Check if everything has been properly installed in jboss, i.e.
- Folders and files jboss-5.1.0.GA/server/default/data/birt/ReportEngine (with all subfolders contents of report engine), jboss-5.1.0.GA/server/default/data/birt/overall_activity.rptdesign, jboss-5.1.0.GA/server/default/data/birt/process_summary.rptdesign
- your jdbc drivers in jboss-5.1.0.GA/server/default/data/birt/ReportEngine/plugins/org.eclipse.birt.report.data.oda.jdbc_2.6.2.r262_v20110127/drivers
If everything is there then please post the stacktrace from jboss log which is in jboss-5.1.0.GA/server/default/log
p.s. the paths above contain birt 2.6.2 names because i've replaced birt 2.3.2 with 2.6.2, just imagine that you will see something similar containing 2_3_2. On the other hand if you want to try out switching to 2_6_2 follow the steps from here http://community.jboss.org/message/602977