code: public String getOriginalJavaPackageName()
      {
          if (javaPackageName == null)
              return null;
  
          String original = javaPackageName.getLast();
          return original != null ? original : javaPackageName.getValue();
      }
docs: Returns the java package name that was configured in the proto. Note that {@link #getJavaPackageName()} will have
  the same value as this, if the compiler options did not have entries that override it.