java.lang.nullpointerexception in j2me

Question

I am writing an application for read the mifare card,but when I pass the APDU the error occur that on emulator \"java.lang.nullpointerexception\".I have successfully detect

Answer 1

Either of iso14443 or textfield1 objects is likely null.

With the way you debug things (quite smart BTW, my congratulations), you could log the checks about as follows:

form.append("\n\n iso14443 is null: [" + (iso14443 == null)
        + "],\n textfield1 is null: [" + (textfield1 == null) + "]");