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Apache Cayenne - Oracle CLOB mapping

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I need to map an Oracle table in Cayenne. This table has a CLOB column that store very long strings.
In Cayenne modeler I set the obj-attribute of this CLOB column to the type java.lang.String so in the auto-generated datamap I have this situation:

But when perform a query I receive this error:

What is the right mapping in this case? I want to store/read string value taken from a CLOB column.
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