Never mind, I figured that out.
I don't know if you have solved this problem yet but I just did.
Try editing the file .../deploy/ejb-deployer.xml
find create table TIMERS
change the types "other" to "blob"
If you are using Oracle 8 you will also need to change the type "timestamp" to "date"
I hope this helps.
In .../conf/standardjaws.xml I also changed the type-mapping from Hypersonic SQL to Oracle 9i and added an Oracle9i type-mapping-definition