JavaCard simple applet not displaying text - javacard

Question

I have the following problem:
Many simple examples found in internet, but no success.
The problem is: My menu entry comes in the STK menu, but if I select it, nothing happens. I tried to display text on event EVENT_MENU_SELECTION.
package helloStk;
import javacard.framework.*;
import sim.access.*;
import sim.toolkit.*;
public class helloStk extends Applet
implements ToolkitConstants, ToolkitInterface
{
private static final byte CMD_QUALIFIER = (byte)0x80;
private byte[] menuEntry = {'M','y','M','e','n','u'};
private byte[] textBuf = {'H','e','l','l','o'};
private ToolkitRegistry reg;
private SIMView gsmFile;
public helloStk() {
//Get the GSM application reference
gsmFile = SIMSystem.getTheSIMView();
enter code here`enter code here`
reg = ToolkitRegistry.getEntry();
reg.initMenuEntry(menuEntry,
(short) 0,
(short) menuEntry.length,
PRO_CMD_DISPLAY_TEXT,
false,
(byte) 0,
(short) 0);
}
public static void install(byte[] bArray, short bOffset, byte bLength)
throws ISOException
{
helloStk dt = new helloStk();
dt.register();
}
public void processToolkit(byte event)
throws ToolkitException
{
ProactiveHandler ph = ProactiveHandler.getTheHandler();
if (event == EVENT_MENU_SELECTION) {
ph.init((byte) PRO_CMD_DISPLAY_TEXT, (byte) CMD_QUALIFIER, DEV_ID_DISPLAY);
ph.appendTLV((byte)(TAG_TEXT_STRING | TAG_SET_CR),
textBuf,
(short) 0,
(short) textBuf.length);
ph.send();
}
}
public void process(APDU apdu) {
if (selectingApplet()) {
return;
}
}
}

Answer 1

You should first call the register() method for the Applet instance and then retrieve the ToolkitRegistry entry.