Platform.getBundle("A.plugin").getEntry("docs/readme.txt")

I have two plugins say A and B.
In my plugin A i have a file readme.txt. it is inside a folder named docs. So i am reading it inside A plugin using a method as :
public void readFile(){
File file = new File("docs/readme.txt");
}
and everything is fine when i run the test case. but now when i call the same method from Plugin B. On executing it from a test case in B. I am not able to read it as the relative path is no more valid. Then how should read it from Plugin B.
Note : I donot have Activator classes in both of these plugins.