Please urgent , Java application does not run

Good afternoon.

I’m sorry if it’s not here to put on settings of avast paid .
I have a client who got the paid version of avast, and it uses a government program here in the state of São Paulo in Brazil.
The same calls Nfe ( electronic invoice ) , which is accessed through the java, and when the modules are active in the message that can not open the application , and disable it opens normally. Java already put the sites in which you need to access. Avast put in exclusions , active protection (files , internet and firewall) , but even so it does not open . Will someone help me ?

Since now
Thank you

avast doesn’t block java.

There is not much more to say without more information.
What OS/SP ?
What exact version of avast ?
Any other security (related) software installed ? (or was there)
What browser is used ?
etc.