import java.io.*;

public class teststack2string {
  public static void main(string s[]){
   try {
     // force an exception for demonstration purpose
     class.forname("unknown").newinstance();
     }
   catch (exception e) {
     system.out.println(stack2string(e));
     }
   }

  static public string stack2string(exception e) {
   try {
     stringwriter sw = new stringwriter();
     printwriter pw = new printwriter(sw);
     e.printstacktrace(pw);
     return "------" + sw.tostring() + "------";
     }
   catch(exception e2) {
     return "bad stack2string";
     }
   }
}