BLOB access in servlet crash.. HELP !!!

Linux Mandrake 7.02 / Sun SDK 1.2.2 SE / Tomcat 3.1 / Oracle 8.0.5 / JDBC 1.2.X
I've got a table which have a LOB column.
I want to retrieve this LOB.
When I do it in a java program, all is well, I get the image in the LOB.
When I put the code in a servlet (ran in Tomcat), Oracle crash with error :
ORA-03115: unsupported network datatype or representation
I checked CLASSPATH for the two runs, all seems ok ...
I don't understand the meaning of this error
Please HELP !!!

[http://forums.sun.com/thread.jspa?threadID=5350426]
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