By default, Weblogic Server wraps data types such as Struct, Blob, Array, Clob, etc.
For instance, oracle.sql.STRUCT becomes weblogic.jdbc.wrapper.Struct_oracle_sql_STRUCT.
That can become a problem if for instance you’re expecting a data type :
oracle.sql.STRUCT objSTRUCT = (oracle.sql.STRUCT) callableStatement.getObject(2);
This would raise the following error :
To avoid it, one can simply disable that wrapping in the Weblogic administration console :
Go to Services > Data sources > Select your datasource > “Connection pools” tab > Advanced :
uncheck “Wrap data types”
Note : Weblogic Server version used is 10.3.5