Using Jar File in Android App

[a_genc]

I have export a java library which connect WCF Service, get / set data. And I want to use this jar file in my Android application. I have import jar file succes. And still classes and methods are shown. But when I run project,
I am taking remoteexception error at calling a method.

Can I call methods in external jar file like that? Is it possible in Android?

Error:
java: cannot access java.rmi.RemoteException
class file for java.rmi.RemoteException not found

Thank you.