OnJava8-Examples/exceptions/LoggingExceptions2.java

// exceptions/LoggingExceptions2.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Logging caught exceptions
// {ErrorOutputExpected}
import java.util.logging.*;
import java.io.*;

public class LoggingExceptions2 {
  private static Logger logger =
    Logger.getLogger("LoggingExceptions2");
  static void logException(Exception e) {
    StringWriter trace = new StringWriter();
    e.printStackTrace(new PrintWriter(trace));
    logger.severe(trace.toString());
  }
  public static void main(String[] args) {
    try {
      throw new NullPointerException();
    } catch(NullPointerException e) {
      logException(e);
    }
  }
}
/* Output:
___[ Error Output ]___
May 09, 2017 6:07:17 AM LoggingExceptions2 logException
SEVERE: java.lang.NullPointerException
        at
LoggingExceptions2.main(LoggingExceptions2.java:17)
*/