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Caused by: java.sql.BatchUpdateException: ORA-01400: cannot insert NULL into ("APPIANDEV"."TEST_DATA"."DATA")
This is an error thrown by the Oracle database when you try to insert a null value into a column that does not allow nulls.
The resolution is to either use code to ensure a null value does not attempt to write to the database or to update your table definition to allow null values for the column.