Application: gvSIG desktop

Se soluciona de la siguiente manera:

En la clase JDBHelper, en el método EditableFeatureAttributeDescriptor se saca el código del default del switch a un nuevo método, de la siguiente manera:

    protected EditableFeatureAttributeDescriptor createAttributeFromJDBC(
            EditableFeatureType fType, Connection conn,
            ResultSetMetaData rsMetadata, int colIndex)
        throws java.sql.SQLException {

        EditableFeatureAttributeDescriptor column;
        switch (rsMetadata.getColumnType(colIndex)) {

        .....

        default:
            column = createAttributeFromJDBCNativeType(fType, rsMetadata, colIndex);

            break;
        }

        return column;

    }

    protected EditableFeatureAttributeDescriptor createAttributeFromJDBCNativeType(
        EditableFeatureType fType, ResultSetMetaData rsMetadata, int colIndex)
        throws SQLException {
        EditableFeatureAttributeDescriptor column;
        column = fType.add(rsMetadata.getColumnName(colIndex),
                DataTypes.OBJECT);
        column.setAdditionalInfo("SQLType", new Integer(rsMetadata
                .getColumnType(colIndex)));
        column.setAdditionalInfo("SQLTypeName", rsMetadata
                .getColumnTypeName(colIndex));
        return column;
    }

Y en la clase PostgreSQLHelper

Se sobrescriben los dos métodos siguientes:

    @Override
    protected EditableFeatureAttributeDescriptor createAttributeFromJDBCNativeType(
        EditableFeatureType fType, ResultSetMetaData rsMetadata, int colIndex)
        throws SQLException {

        EditableFeatureAttributeDescriptor column;

        String nativeType = rsMetadata.getColumnTypeName(colIndex);

        if (nativeType.startsWith("int")) {
            column = fType.add(rsMetadata.getColumnName(colIndex),
                DataTypes.INT);
            column.setAdditionalInfo("SQLType", new Integer(rsMetadata
                .getColumnType(colIndex)));
            column.setAdditionalInfo("SQLTypeName", rsMetadata
                .getColumnTypeName(colIndex));
            return column;
        }
        return super.createAttributeFromJDBCNativeType(fType, rsMetadata, colIndex);
    }

    @Override
    public Object dalValueToJDBC(
        FeatureAttributeDescriptor attributeDescriptor, Object object)
        throws WriteException {
           if ("int2".equals(attributeDescriptor.getAdditionalInfo("SQLTypeName"))) {
                return new Short(String.valueOf(object));
            }

        return super.dalValueToJDBC(attributeDescriptor, object);
    }