Code analysis: Find all possible concrete classes given a handle to an interface?

Hi,

I have a code analysis question.  How can I find all possible concrete classes given a handle to an interface?  I think I need to use an Analyzer and examine Frames to keep track of it, but not sure exactly how.

For example say I have a large codebase and am calling this method throughout my code:

public class Util{
 public static void foo(java.util.List<String> someList){
   /**
     some code
    **/
 }
}

Is there a way to find all possible concrete classes that get passed into Util::foo() ?  For example someone could pass in a java.util.ArrayList<String> or a java.util.LinkedList<String>.

There should be someway to do a backwards data flow analysis to get this, not sure how.  Any help is appreciated.

Thanks,
Mark

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