Client transact method generates a NullPointerException after sending STOP_ROSPEC

[iamadou]

Hi,

After tag's read when we try to send STOP_ROSPEC message, it is our first stopping message, the client.transact generates for us an java.lang.NullPointerException. We run our code inside raspberry, we hope that the reason could be memory problem? If any one have an response, it could be helpful.
Thank

[kenwenzel]

Could you please provide a stack trace or at least a line number where the exception is thrown?

[kenwenzel]

Can you call printStackTrace() on the exception to find the actual line where it happend?
Thank you.