code: public static JavaClassAndMethod findExactMethod(InvokeInstruction inv, ConstantPoolGen cpg, JavaClassAndMethodChooser chooser)
              throws ClassNotFoundException {
          String className = inv.getClassName(cpg);
          String methodName = inv.getName(cpg);
          String methodSig = inv.getSignature(cpg);
  
          JavaClass jclass = Repository.lookupClass(className);
          return findMethod(jclass, methodName, methodSig, chooser);
      }
docs: Look up the method referenced by given InvokeInstruction. This method
  does <em>not</em> look for implementations in super or subclasses
  according to the virtual dispatch rules.
  
  @param inv
  the InvokeInstruction
  @param cpg
  the ConstantPoolGen used by the class the InvokeInstruction
  belongs to
  @param chooser
  JavaClassAndMethodChooser to use to pick the method from among
  the candidates
  @return the JavaClassAndMethod, or null if no such method is defined in
  the class