||A ClassDefinitionException is thrown if the settings of a
persistent class are inconsistent with it's metadata.
||A ColumnDefinitionException is thrown if the settings of a
database column are incompatible with the data type of the object field
to which it is mapped.
||A DuplicateDatastoreFieldException is thrown if an attempt is made to
add a column to a table with a name already in-use by an existing column.
||A IncompatibleQueryElementTypeException is thrown if a variable used
in a query is detected to have an type incompatible with the element type of
the collection to which it is being applied.
||A NoDatastoreMappingException is thrown if an operation is performed that
assumes that a particular persistent field is stored in a single datastore
field when it is not (such as if the field is a Collection or a Map).
||A NoSuchPersistentFieldException is thrown if a reference is made
somewhere, such as in a query filter string, to a field that either doesn't
exist or is not persistent.
||A NoTableManagedException is thrown if an attempt is made to perform an
operation using a class that is not backed by an table or view
in the database and the operation is not supported on such classes.
||A NullValueException is thrown if a null value is encountered
in a database column that should prohibit null values.
||A TooManyForeignKeysException is thrown when trying to add a foreign
key to a table and the table already has the maximum allowed number of
||A TooManyIndicesException is thrown when trying to add an index
to a table and the table already has the maximum allowed number of indices.
||A UnsupportedDataTypeException is thrown if an attempt is made
to persist an object field whose data type is not supported by the database
and/or the persistence package.