code: private static void printStackTraceElement(StackTraceElement trace,
                                               PrintWriter out,
                                               ClassLoader loader)
    {
      try {
        LineMap map = getScriptLineMap(trace.getClassName(), loader);
  
        if (map != null) {
          LineMap.Line line = map.getLine(trace.getLineNumber());
          if (line != null) {
            out.print(trace.getClassName() + "." + trace.getMethodName());
            out.print("(" + line.getSourceFilename() + ":");
            out.println(line.getSourceLine(trace.getLineNumber()) + ")");
            return;
          }
        }
      } catch (Throwable e) {
      }
      
      out.println(trace);
    }
docs: Prints a single stack trace element.