Need to import my java class. Please help

Dear all.
I made a java class named GetOS which contains a method that return th OS name. Then I deployed this class to a Jar file called tarek.jar.
now I need to import this jar file in my form
i'm using forms9i release2
I did the following:
I copied "tarek.jar" to \\developerhome\forms90\java\
then I opend the forms builder - program-import java class but my jar file "tarek" doesn't exist in the list.
please help.

Dear all
I solved this problem. I editing the class path of the system control panel>system>advanced and it works fine
Now i can import my class easly without any problems
But when the forms builder imported my class , it generates a pl/sql package which contains a function with the same name of the method i did in my class.The problem is I do not know how to call this function
Function getOSname( obj ora_java.jobject)
return varchar2 is
begin
cls := jni.get

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