a question

[software-engineer2008]

hi

I run this sample for java card applet in Intellij IDEA witt doing all steps in readme....But I got this error .

java.lang.NullPointerException
at javacard.framework.Applet.register(Applet.java:266)
at helloWorld.HelloWorld.(HelloWorld.java:17)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at java.lang.Class.newInstance(Class.java:433)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:799)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:728)
at sun.applet.AppletPanel.run(AppletPanel.java:378)
at java.lang.Thread.run(Thread.java:745)

would you please help me?

thanks

[FractalizeR]

Try to call parent constructor by calling super() before register() in HelloWorld().

[software-engineer2008]

thanks.
I did it but I got this error again. Should I change the config in the bellow image? would you help me?

[FractalizeR]

I thnik this is an emulator problem. Exception happens on Applet.java:266. This is a line where SimulatorSystem.registerApplet(this); happens if you use JC 2.2.2.

[software-engineer2008]

So, should I use other library (Egate) because of that error?

[FractalizeR]

You can try, but that would be for a real card only. You can't use real egate libraries at Emulator.