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Java Development

New Developer
Posts: 2
Registered: ‎10-14-2009
My Device: Not Specified

Trouble reading JAD properties in MIDlet on Storm





I am having trouble reading JAD application properties in a MIDlet on BlackBerry Storm 9530. The test application I wrote is quite simple.  I have an array of property names, and for each I make a MIDlet.getAppProperty() call to obtain the value.


What is happening is this.  If I start out with just the properties that the JDE inserts into the JAD file, I can read all of these and list it on the display.  If I add a small number of custom properties, say 2, then these also display properly.  But at some point, when about 6-8 custom properties have been added, all the properties, including the RIM-xxxx properties that were previously visible now all return null.



I've checked the BlackBerry documentation and there seems to be a 4KB limit on jad files, but my jad file  is  <1KB.  Are there restrictions on the number of custom properties? 

 The test application is listed below:





* JadProps.java
* (c) Research In Motion Limited, 2003-2004. Confidential and proprietary.

import java.util.*;
import java.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.lang.*;

* The application must extend the MIDlet class to allow the application management software to control the MIDlet.
public class JadProps extends MIDlet

* argv holds application property key names from the jad file.
final String argv[] = {
// The above are what JDE 4.7.0 adds to JAD file for each build.

// Custom properties start here
// If I only include the above properties in the jad file,
// the jad file can be read in with MIDlet.getAppProperty().

// As soon as I add this property, all the properties except
// for MIDlet-xxxx, MicroEdition-xxxx, and RIM-MIDlet-Flags-1
// become null, when I try to access with MIDlet.getAppProperty().

* <p>The default constructor.
public JadProps()

* <p>Signals the MIDlet that it has entered the Active state.
public void startApp()
new Thread() {
public void run() {
Form form = new Form("JAD PROPS");
StringItem si;
String prop;
// Display each property as
// i: propName=[propValue]
for (int i = 0; i < JadProps.this.argv.length; i++) {
String propName = JadProps.this.argv[i];
String propValue = JadProps.this.getAppProperty(propName);
prop = propName + "=[" + propValue + "]";

si = new StringItem("" + i + ": ", prop);

// This is just to provide a way out of the app.
final Command exit = new Command("Done", Command.OK, 0);
form.setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable d) {
if (c == exit) {

// Make the form visible on the display.

* <p>Signals the MIDlet to stop and enter the Pause state.
public void pauseApp()

* <p>Signals the MIDlet to terminate and enter the Destroyed state.
* @param unconditional When set to true, the MIDlet must cleanup and release all resources. Otherwise, the MIDlet may
* throw a MIDletStateChangeException to indicate it does not want to be destroyed at this time.
public void destroyApp(boolean unconditional)

The jad file used is this:

Manifest-Version: 1.0
RIM-COD-Module-Name: JadProps
RIM-COD-Module-Dependencies: net_rim_cldc
MIDlet-Jar-Size: 4029
MIDlet-1: JadProps,,JadProps
RIM-COD-Creation-Time: 1255493063
MIDlet-Jar-URL: JadProps.jar
RIM-COD-URL: JadProps.cod
RIM-COD-SHA1: 84 d6 ad ab f8 7e 7f 03 c1 9b f9 2d 00 b9 51 04 6a 7d 0a 57
RIM-COD-Size: 4452
MicroEdition-Configuration: CLDC-1.1
MIDlet-Version: 1.0.29
MIDlet-Name: JadProps
MIDlet-Description: Testing Jad Props on Storm
MIDlet-Vendor: xxxxxxx xxxxxx
MicroEdition-Profile: MIDP-2.0
RIM-MIDlet-Flags-1: 0
XPP-Codebase: http://xxx.xxxxxxx.com:80/xxxxx/xxxxxxxx/xxxxxxxxxxxxxxxx/
XPP-Embed: 6
XPP-Memory-Check: NOLOG
XPP-Filename: xxxxxxxx
XPP-ContentServer-URL: http://xxx.xxxxxxx.com:80/xxxxxxxxxxxxx/xx/xxxxxxxxxx
XPP-TraceLog-URL: http://xxx.xxxxxxx.com:80/xxxxxxxxxx/xxx/xxxxxxxxxx
XPP-StreamBase: rtsp://xxxxxxxxx.xxxxxxx.com:554/xxxxxxxx/xxxxxxxxxxx/
XPP-Player-Cache-State: 0
XPP-TraceLog-Level: WARN
XPP-TraceLog-Output: HTTP



Can anyone help me on why the properties all turn to null when I add one more custom property?





New Developer
Posts: 2
Registered: ‎10-14-2009
My Device: Not Specified

Re: Trouble reading JAD properties in MIDlet on Storm

I should mention that I am loading this application onto the Storm OTA via the browser by pointing to the URL of the jad file.
Posts: 3,951
Registered: ‎07-15-2008
My Device: Not Specified

Re: Trouble reading JAD properties in MIDlet on Storm

Very interesting. Could you check with different devices and supported OS.

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