help: how to modify the table schema for derby DB

The persisitent storage we use for openjms is postgresql right now.
    Openjms always throws error message like this:
    ERROR [LeaseManager] - Cannot remove
    message=ID:b3f55374-c16e-1004-8eee-11dd688bf151
    If I use derby to replace postgresql, it seems work fine.
    But another problem sometimes happens, if a message is too long, the
    default schema of table message won't be allowed to store such a
long
    message.
    So I think I should try to modify the table schema.
    Does anyone know where should I start for this purpose ?
    Thanks !
    Ken
-- 
研發部             胡重威             Ken Hu          [email protected]

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