Share this page 

Put printStackTrace() into a StringTag(s): Language


public class TestException {
  public static void main(String args[]) {
    try {
      throw new Exception("for no reason!");
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }
  // output :
  //   java.lang.Exception: for no reason!
  //      at TestException.main(TestException.java:8)
}

You can redirect the StackTrace to a String with a StringWriter/PrintWriter : 

import java.io.PrintWriter;
import java.io.StringWriter;

public class TestException {
  public static void main(String args[]) {
    try {
      throw new Exception("for no reason!");
    }
    catch (Exception e) {
      StringWriter sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw);
      e.printStackTrace(pw);
      System.out.println(sw.toString().toUpperCase());
    }
  }
  // output :
  //    JAVA.LANG.EXCEPTION: FOR NO REASON!
  //        AT TESTEXCEPTION.MAIN(TESTEXCEPTION.JAVA:7)
}

This can be useful if you want to format the StackTrace before showing it to the user.

mail_outline
Send comment, question or suggestion to howto@rgagnon.com