java - Class Availabilty Check -

i have dependency jar, build a, dependency.jar contain classes a,b,c,d. build b, dependency.jar contain classes a,b,c

problem:

source: code making use of classes a,b,c,d.

goal: code have written should remain same build , b.

problem: class d won't available in build b. code should handle availability of class d. @ same time code , going add handle availability of class d , should not slow down code.

please suggest possible solutions.

one solution: make use of class.forname() api check availability of class.

problem solution: api throw classdefnotfound every time if not available, , per understanding class.forname try load class , slow.

note: class d optional, if not available , functionality related class should disabled

you can use method getresource() on class or class loader object of class. if it's return null class not present below

url url=someclass.class.getclassloader().getresource("classname.class");  if(url==null)//class not present