Known Issues for Native Object API

The cause is that Apache implements the HTTP 1.1 specification in such a way that the HTTP header coming from the client, Transfer-Encoding: "Chunked" is not accepted due to the capitalized "c" in "Chunked".

RequestHeader edit Transfer-Encoding Chunked chunked early

There is additional and corrected information for the Tracking KPI topic in the Developer Guide: iOS Object API Applications.

Workaround: See Tracking KPI for iOS Devices.

For the Android, BlackBerry, Windows, iOS, and Windows Mobile object API, when a synchronization parameter is bound to the default personalization parameter "username", the default personalization parameter "username" will not take effect if the client application has never before synchronized.

Workaround: Set values explicitly for the synchronization parameters. Do not use values from the default personalization parameters.

You receive memory warnings in your application because of too many autoreleased objects. One example is when there are many objects at the application level through the findAll method.

Workaround: To reduce memory growth, use the appropriate autorelease pool. For more information, see this document from Apple: https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmAutoreleasePools.html .

By default, Sybase Mobile SDK installer configures the system to use the 32-bit packaging tool. If you try to run the 64-bit packaging tool (PackagingTool64.bat) after completing a new or upgrade installation of Sybase Mobile SDK on a 64-bit Windows system, launching the tool fails with this message:

Cannot load 64-bit SWT libraries on 32-bit JVM

For Windows, Windows Mobile, Android and BlackBerry Object API clients, when the device application connects to the Unwired Server, the Unwired Server shuts down, and the device application calls startConnection again immediately after the shutdown occurs, an ApplicationRuntimeException may be thrown indicating Client state error. Client is already started, without attempting to reconnect to the server.

Workaround: You can catch the exception in the device application, sleep a few hundreds of milliseconds, and retry by calling Application.startConnection(timeout) again. After one or two seconds, you can try to reconnect.

Workaround: To read the contents and/or import the content to an MS Excel spreadsheet, perform the following steps:

1. Right click on perflog.txt to select Open with > MS Word.
2. Select Unicode 6.0 UTF-8 in Text encoding in the MS Word file conversion dialog. Click OK to see the content in MS Word. 
3. Select all the content in the MS Word file and choose Tables > Convert Text to Table. In the Convert Text to Table dialog, set ":" in "Separate text at "Other", and set "AutoFit to contents" in AutoFit Behavior. 
4. Choose Save as with Format set to "Web Page". Your file is saved as "PerfLog.htm". 
5. Choose File > Import > HTML file in MS Excel. 

When you call the update method on a new MBO instance, an ObjectNotSaved exception is thrown. For example:

MBO instance = new MBO(); 
instance.${UpdateMethod}(); //UpdateMethod is a update method defined in the model. 

Workaround: Do not call the update method for a new instance. Only call update when the instance is either created or saved.

Workaround:  Set the personalization key value manually directly in the application code.

The Android Object API is not able to synchronize with an HTTPS server unless the device has access to the root certificate of the certificate used to sign the certificate presented by the server. 

Workaround: Use the root certificate on the device.

In some cases, operation replay records that you upload to the Unwired Server are not processed in the correct order on the server. For example:

[customer create];   // inserts a row into the MBO table
[customer submitPending];   // inserts a row into the operation replay table
[customer delete];   // deletes the row from the MBO table (because of server-side processing, does not remove the row from the operation replay table)
[customer submitPending];   // does nothing 

Workaround: Call cancelPending operation to cancel any pending record before submitting another operation.

By default asynchronous operation replay is enabled. When an application is connected (by Application.StartConnection() or Application.RegisterApplication), it may receive background notifications, and trigger a synchronize or other database operation. If you try to delete the database, you may receive database exceptions.

Workaround: Before deleting the database, stop the application connection (Application.StopConnection()).

Workaround: Carefully evaluate whether the compression trade-off is appropriate in the deployment environment, and carefully size the server capacity to support it. If appropriate in a particular environment, follow the Sybase Unwired Platform Developer Guides to enable compression.

For example, in this connected result set for a BlackBerry client, rs.getRow() may not return the correct value:

Query query = new Query(); 
query.select("c.id as Id, c.fname as Fname, c.state as countState"); 
query.from("Customer", "c"); 
query.setConnectedResultSetEnabled(true); 
QueryResultSet rs = MyDatabase.executeQuery(query); 
rs.executeQuery(); 
rs.last(); 
rs.afterLast(); 
rs.previous();

Workaround: Do not use the query.getRow() API QueryResultSet.previous\next return Boolean to indicate if the current position is valid. Rely on the return value instead.

In Windows Mobile applications that use message-based synchronization, when a row reaches 3MB or more, and the client invokes the SQLite create operation during subscription, an internal exception is generated, data import fails, and the import operation fails to commit the transaction.

Workaround: None.