Security exception on reading Embedded UID

[mpharsha]

Hi,
Im using Series 40 Nokia 6212 emulator and I was able to read Embedded UID sometime back using the below code....

	protected void startApp() throws MIDletStateChangeException {
		Display.getDisplay(this).setCurrent(form);
 
		MFStandardConnection myTag = null;
		try 
		{
			System.out.println("Start application\n");
			myTag = (MFStandardConnection) Connector.open(System.getProperty("internal.mf.url"));
			System.out.println("Connection opened\n");
			form.append("My UID: " + decodeUID(myTag.getManufacturerBlock().getUID()));
		}
		catch (Exception e) 
		{
			System.out.println("Connection failed\n");
			form.append(e.toString());
		} 
		finally 
		{
			if (myTag != null) 
			{
				try 
				{
					myTag.close();
				}
				catch (IOException e) 
				{
					form.append(e.toString());
				}
			}
		}
	}

The above code was working fine... After some days when I checked suddenly its giving java.lang.SecurityException... Absolutely there is no change in the code.. Im new to this J2ME.. Please let me know what might be the problem...

Thanks in Advance

With Regards
Harsha

[mroland]

Hallo Harsha,

accessing the secure element/MIFARE area, i.e.

Connector.open(System.getProperty("internal.mf.url"))

and

Connector.open(System.getProperty("internal.se.url"))

requires the MIDlet to be trusted by the phone.

On a real phone (Nokia 6131 NFC and Nokia 6212) the only way to get your application trusted is by signing it with a valid Java code signing certificate. This can be bought for instance from Thawte.

On the emulator you can bypass this limitiation by changing the trust level in the emulator's settings. In the emulator window select the menu Tools -> Preferences... On the MIDP tab there is a setting called "Security domain". If you set this value to either "trusted" or "maximum" your application should work again.

br,
Michael

[mpharsha]

Hi,

Thank you very much... Its working now... I changed Security domain setting to "Maximum"...

With regards,
Harsha