Cannot use Card reader for more than 2 time.

That might be an issue with the hardware itself. Check its docs

or the java program is limited to 2x reading?

Try getAtr().getBytes() before and after the call to the reader and see what that tells you if anything.

Have some good points.
However, the program use by many people but
only the user have the problem.
If any checking program can help us?
Java 8.91 and Java 7.101 are the current Java program.

Would have been nice if you'd included that piece of information in the original problem description. This TA is more focused on Java code problems, and this is more likely than not, as has already been said, some form of hardware problem, or some old hardware or OS of the machine in question, or underpitched RAM. You'd probably get a faster answer if you tell us all the detail you have, particularly regarding the spec of this machine.

The PC information as below:
Win7 pro
Java program
It need read the e-cert ftom card reader.
Java 7u101 or
Java 8u91( we select it)
Any info you need?

test if it works from another user account

Any info you need?

You do realise that you haven't mentioned the card reader ..?

Are you an IT manager, or are you just incidentally helping out a department colleague?

Card reader is Omnikey 3121

IT people

Ask the manufacturer to eliminate the hardware as a cause of the problem

did you try my suggestion?

ok,let me try.

I had created an new profile. reinstall java , reinstall card reader......but in vain.  only success 2 times the third will halt.

Upgrade to the paid-for version.

JAVA is free version? pai-for what?
Yesterdays, i upgrade to new version from 8.91 to 8.102.
It cannot sign.
After I reinstall 8.91, it can do 2 times.
Why?

My guess is that the reader is tied to a specific version of Java (which it shouldn't be). Check the docs

More guesses include :

Disable TLS2
Uptry to USB 3 or downtry to 2.0.
Try a USB cable from another machine, and/ or another reader that works.

IE 11 only have TSL 1.0, 1.1 and 1.2
No  TSL 2.
Any suggestion?

Solved