Problem to connect from taglib


I try to make a call to a method wich proceed my request from a class extends TagSupport.
When i do it from a test class it works perfecly, my jsp works well too when i test it with a simple tag.
It seems to me that it wont make the connection and i don’t know why.

this is the error i get:
StandardWrapperValve[jsp]: “Servlet.service()” pour la servlet jsp a g