Oracle® Database Application Express

3.1 Web Browsers No Longer Supported

The following Web browsers are no longer supported:

• Netscape Communicator 7.2 or higher

• Mozilla 1.7 or higher

4.1 Access Denied When Validating Migration Export File

If you enter invalid text in the Migration Export File field in the first step of the Create Project wizard, you might receive an Access Denied error and the progress bar might persist. This may occur when you are using Internet Explorer 6.0 on Windows XP.

This issue is tracked with Oracle bug 5614432.

Workaround:

Use either the Browse option or enter the full path manually. Be sure to enter a valid SQL script and path in this field.

4.2 Supported Web Browsers

To view or develop Oracle Application Express applications, Web browsers must support JavaScript and the HTML 4.0 and CSS 1.0 standards. The following browsers meet this requirement:

• Microsoft Internet Explorer 6.0 or higher (Windows only)

• Firefox 1.0 or higher

4.3 Editing Scripts with Multibyte Characters in the First Line

SQL scripts containing multibyte characters cannot be edited in the SQL Script editor if multibyte characters occur in the first line. Note that this issue does not occur when using Internet Explorer 7.0 and Firefox 1.5.0 or higher.

Workaround:

This issue most often occurs when the first line of the script contains multibyte characters. You can correct this problem by adding a new first line containing non-multibyte characters, for example two hyphens (--), and making sure the line containing multibyte characters moves to the second line.

4.4 Problems with SVG Charts

If you experience problems with an SVG chart, try migrating the chart to a Flash chart.

To migrate an SVG chart to Flash:

1. Navigate to the appropriate Page Definition.

2. Under Regions, click the region name. The region name displays to the left of SVG Chart.

3. On the Region Definition, click Migrate SVG Chart to Flash Chart on the Tasks list.

4. Click Migrate.

4.5 No Support for Running in an EBCDIC Character Set

Oracle Application Express does not support an EBCDIC character set. The value of the character set in the configuration of the mod_plsql Database Access Descriptor (DAD) must be set to AL32UTF8, regardless of the underlying database character set.

4.6 Problems with Queries Containing a Bind Variable and a String with Two Dashes

Creating a report region based on a query that contains a string with two dashes may hinder the Application Express Engine's ability to handle item bind variable references. Consider the following example:

SELECT ename, job, sal, comm, deptno
FROM   emp
WHERE instr ('-'||'-dash-'||'-','uu') = 0 
AND deptno = :P18_X 
AND 1 = 1 

Workaround:

You can correct this behavior by changing the bind variable format. For example, to correct this issue in the previous example you would change :P18_X to v('P18_X').

4.7 Importing Spreadsheet Data Containing Quotation Marks

If you import spreadsheet data by copying and pasting and a column value contains a double quotation mark, the data will not import correctly (for example, 54" Plasma Flat Screen). To avoid this problem, you have two options:

• Option 1:

  1. Save the data in a delimited format (such as comma-delimited (.csv) or tab-delimited).

  2. Use Import Text Data wizard to upload and import the saved file.

• Option 2:

  1. Replace the quotation mark with two double quotation marks as shown in the following example:

     54"" Plasma Flat Screen
     
     

  2. Use the Import Spreadsheet Data wizard to import the file.

4.8 Column Attribute Format in Japanese

When you view the Number/Date Format popup dialog on the Column Attributes page, the following appears in the dialog box:

\ + 5,234.10

It is expected that the symbol of 'yen' displays accurately in a Japanese environment.

Note that the backslash (\) and yen are the same character code point, but display differently depending on the selected font. A backslash (\) also displays when applying the data format on the page in the application.

This issue is tracked with Oracle bug 3384664.

4.9 Creating an Item with a Japanese Item Name

If you create a form on a table or view based on an included column whose name is in Japanese using a wizard, the name of the new item will be included in Japanese.

This issue is tracked with Oracle bug 3393090.

Workaround:

To correct this problem, when you create new items on the Page Definition use alphanumeric characters A_Z, 0-9 and '_' for the item names. You may also need to changes item names to alphanumeric before you apply changes to the item.

4.10 Runtime Errors in an Application Imported from a Previous Release

If you export an application from an earlier Oracle Application Express release and then import and install it using the installation pages in Application Builder, in rare situations you may encounter runtime errors after the application installs.

These errors often manifest themselves as PL/SQL parser or execution errors pertaining to blocks of PL/SQL code embedded within application components. The installation process sometimes splits strings greater than 200 characters into multiple lines. For example, lines may split between PL/SQL keywords, or at other places that cause parsing errors.

Workaround:

If you encounter these types of errors and suspect the installation process has split large strings:

1. Isolate the failing component containing the suspect PL/SQL within the application by editing the failing page in Application Builder.

2. Locate the blocks of code that appear to split incorrectly.

3. Attempt to split the blocks of code in more appropriate places, or insert white space with the lines until no runtime errors are observed.

4. Export the application, import the export file, and then reinstall it.

5. Retain the new export file as a permanent backup copy.

4.11 Creating a Web Reference on a WSDL that Has Input Parameters Defined as Arrays

If you create a Web service reference in Oracle Application Express on a WSDL document that has input parameters defined as arrays, you will not be able to use built-in wizards to create a form or a form and report on that Web reference.

This issue is tracked with Oracle bug 3922270.

Workaround:

Oracle Application Express does not provide a user interface for input parameters that are arrays. Output parameters that are defined as arrays are handled properly if you use the Form and Report on Web Service Wizard.

4.12 No Support for Corel SVG Viewer

Oracle Application Express release 3.0 does not support the Corel SVG Viewer.

4.13 Enabling Network Services in Oracle Database 11g

By default, the ability to interact with network services is disabled in Oracle Database 11g release 1 (11.1). Therefore, if you are running Oracle Application Express with Oracle Database 11g release 1 (11.1), you need to use the new DBMS_NETWORK_ACL_ADMIN package to grant connect privileges to any host for the FLOWS_030000 database user. Failing to grant these privileges results in issues with:

• Sending outbound mail in Oracle Application Express.

  Users can call methods from the APEX_MAIL package, but issues arise when sending outbound email.

• Using Web services in Oracle Application Express.

• PDF/report printing.

• Searching for content in online Help (that is, using the Find link).

Granting Connect Privileges

The following example demonstrates how to grant connect privileges to any host for the FLOWS_030000 database user.

DECLARE
  ACL_PATH  VARCHAR2(4000);
  ACL_ID    RAW(16);
BEGIN
  -- Look for the ACL currently assigned to '*' and give FLOWS_030000
  -- the "connect" privilege if FLOWS_030000 does not have the privilege yet.

  SELECT ACL INTO ACL_PATH FROM DBA_NETWORK_ACLS
   WHERE HOST = '*' AND LOWER_PORT IS NULL AND UPPER_PORT IS NULL;

  -- Before checking the privilege, make sure that the ACL is valid
  -- (for example, does not contain stale references to dropped users).
  -- If it does, the following exception will be raised:
  --
  -- ORA-44416: Invalid ACL: Unresolved principal 'FLOWS_030000'
  -- ORA-06512: at "XDB.DBMS_XDBZ", line ...
  --
  SELECT SYS_OP_R2O(extractValue(P.RES, '/Resource/XMLRef')) INTO ACL_ID
    FROM XDB.XDB$ACL A, PATH_VIEW P
   WHERE extractValue(P.RES, '/Resource/XMLRef') = REF(A) AND
         EQUALS_PATH(P.RES, ACL_PATH) = 1;

  DBMS_XDBZ.ValidateACL(ACL_ID);
   IF DBMS_NETWORK_ACL_ADMIN.CHECK_PRIVILEGE(ACL_PATH, 'FLOWS_030000', 
     'connect') IS NULL THEN 
      DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE(ACL_PATH, 
     'FLOWS_030000', TRUE, 'connect'); 
  END IF;

EXCEPTION
  -- When no ACL has been assigned to '*'.
  WHEN NO_DATA_FOUND THEN
  DBMS_NETWORK_ACL_ADMIN.CREATE_ACL('power_users.xml',
    'ACL that lets power users to connect to everywhere',
    'FLOWS_030000', TRUE, 'connect');
  DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL('power_users.xml','*');
END;
/
COMMIT;

Troubleshooting an Invalid ACL Error

If you receive an ORA-44416: Invalid ACL error after running the previous script, use the following query to identify the invalid ACL:

REM Show the dangling references to dropped users in the ACL that is assigned
REM to '*'.

SELECT ACL, PRINCIPAL
  FROM DBA_NETWORK_ACLS NACL, XDS_ACE ACE
 WHERE HOST = '*' AND LOWER_PORT IS NULL AND UPPER_PORT IS NULL AND
       NACL.ACLID = ACE.ACLID AND
       NOT EXISTS (SELECT NULL FROM ALL_USERS WHERE USERNAME = PRINCIPAL);

Next, run the following code to fix the ACL:

DECLARE
  ACL_ID   RAW(16);
  CNT      NUMBER;
BEGIN
  -- Look for the object ID of the ACL currently assigned to '*'
  SELECT ACLID INTO ACL_ID FROM DBA_NETWORK_ACLS
   WHERE HOST = '*' AND LOWER_PORT IS NULL AND UPPER_PORT IS NULL;

  -- If just some users referenced in the ACL are invalid, remove just those
  -- users in the ACL. Otherwise, drop the ACL completely.
  SELECT COUNT(PRINCIPAL) INTO CNT FROM XDS_ACE
   WHERE ACLID = ACL_ID AND
         EXISTS (SELECT NULL FROM ALL_USERS WHERE USERNAME = PRINCIPAL);

  IF (CNT > 0) THEN

    FOR R IN (SELECT PRINCIPAL FROM XDS_ACE
               WHERE ACLID = ACL_ID AND
                     NOT EXISTS (SELECT NULL FROM ALL_USERS
                                  WHERE USERNAME = PRINCIPAL)) LOOP
      UPDATE XDB.XDB$ACL
         SET OBJECT_VALUE =
               DELETEXML(OBJECT_VALUE,
                         '/ACL/ACE[PRINCIPAL="'||R.PRINCIPAL||'"]')
       WHERE OBJECT_ID = ACL_ID;
    END LOOP;

  ELSE
    DELETE FROM XDB.XDB$ACL WHERE OBJECT_ID = ACL_ID;
  END IF;

END;
/

REM commit the changes.

COMMIT;

Once the ACL has been fixed, you need to run the first script in this section to apply the ACL to the FLOWS_030000 user. See "Granting Connect Privileges".

4.14 Issues with New HTML Editor

Users may encounter unexpected results when using the new item type HTML Editor Standard and the Find functionality. When using an item of type HTML Editor Standard with a Firefox browser, the cursor must be placed at the beginning of the text for the Find feature to function properly. In certain situations, the Find functionality may incorrectly report that the text is not found.

4.15 Restrictions for Features Requiring DBA Authentication

The following restriction applies to features in Oracle Application Express that require DBA authentication (for example, the Session report on the Database Monitor page). The DBA account used for authentication must not require double-quoting. In other words, it cannot be lower or mixed case.

4.16 Exporter Tool Support for Microsoft Access

When migrating a Microsoft Access application to an Application Express application, you export your Microsoft Access metadata using the Exporter tool. Note that Exporter Tool for Microsoft Access supports Microsoft Access 97, Microsoft Access 2000, Microsoft Access 2002, and Microsoft Access 2003, but does not support Microsoft Access 2007.

4.17 Problems When Purging Recycle Bin

Although the message Recycle bin purged may appear, Purge Recycle Bin functionality does not work when running Application Express with Oracle Database 11g Release 1 (11.1).

This issue is tracked with Oracle bug 6025570.