code: public static SourceLineAnnotation createUnknown(@DottedClassName String className) {
          return createUnknown(className, AnalysisContext.currentAnalysisContext().lookupSourceFile(className), -1, -1);
      }
docs: Factory method to create an unknown source line annotation. This variant
  looks up the source filename automatically based on the class using best
  effort.
  
  @param className
  the class name
  @return the SourceLineAnnotation