Examples of org.apache.log4j.spi.ThrowableInformation

org.apache.log4j.spi.ThrowableInformation
ThrowableInformation is log4j's internal representation of throwables. It essentially consists of a string array, called 'rep', where the first element, that is rep[0], represents the string representation of the throwable (i.e. the value you get when you do throwable.toString()) and subsequent elements correspond the stack trace with the top most entry of the stack corresponding to the second entry of the 'rep' array that is rep[1]. Note that ThrowableInformation does not store the throwable it represents. @author Ceki Gülcü

        logstashEvent.put("@source_host", hostname);
        logstashEvent.put("@message", loggingEvent.getRenderedMessage());
        logstashEvent.put("@timestamp", dateFormat(timestamp));


        if (loggingEvent.getThrowableInformation() != null) {
            final ThrowableInformation throwableInformation = loggingEvent.getThrowableInformation();
            if (throwableInformation.getThrowable().getClass().getCanonicalName() != null) {
                exceptionInformation.put("exception_class", throwableInformation.getThrowable().getClass().getCanonicalName());
            }
            if (throwableInformation.getThrowable().getMessage() != null) {
                exceptionInformation.put("exception_message", throwableInformation.getThrowable().getMessage());
            }
            if (throwableInformation.getThrowableStrRep() != null) {
                String stackTrace = StringUtils.join(throwableInformation.getThrowableStrRep(), "\n");
                exceptionInformation.put("stacktrace", stackTrace);
            }
            addFieldData("exception", exceptionInformation);
        }

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        if (logger.isLogging(level)) {
            // Then, generate the output message, including the required text
            // and optional throwable
            String message = null;
            Throwable throwable = null;
            final ThrowableInformation throwableInformation =
                    event.getThrowableInformation();


            if (throwableInformation != null) {
                throwable = throwableInformation.getThrowable();
            }


            if (layout != null) {
                message = layout.format(event);
            } else {

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        } else {
            text = layout.format(event);
        }


        if (layout == null || layout.ignoresThrowable()) {
            ThrowableInformation info = event.getThrowableInformation();


            if (info != null) {
                thrown = info.getThrowable();
            }
        }


        // Translate the log level to an equivalent status code
        if (level.toInt() >= Level.ERROR_INT) {

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      loggingEvent.setTimeStamp(timeStamp);
      loggingEvent.setLevel(level);
      loggingEvent.setThreadName(threadName);
      loggingEvent.setMessage(message);
      loggingEvent.setNDC(ndc);
      loggingEvent.setThrowableInformation(new ThrowableInformation(exception));
      loggingEvent.setLocationInformation(info);
      loggingEvent.setProperties(properties);
      
      events.add(loggingEvent);

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      String[] strRep = new String[len];
      for (int i = 0; i < len; i++) {
        strRep[i] = (String) v.get(i);
      }
      // we've filled strRep, we now attach it to the event
      event.setThrowableInformation(new ThrowableInformation(strRep));
    } finally {
      if (statement != null) {
        statement.close();
      }
    }

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    event.setLogger(logger);
    event.setTimeStamp(timeStamp);
    event.setLevel(levelImpl);
    event.setThreadName(threadName);
    event.setMessage(message);
    event.setThrowableInformation(new ThrowableInformation(exception));
    event.setLocationInformation(info);
    event.setNDC(ndc);
    event.setProperties(properties);
    return event;
  }

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   * @see org.apache.log4j.pattern.PatternConverter#convert(org.apache.log4j.spi.LoggingEvent)
   */
  protected StringBuffer convert(LoggingEvent event) {
    StringBuffer buf = new StringBuffer(32);


    ThrowableInformation information = event.getThrowableInformation();


    if (information == null) {
      return buf;
    }


    String[] stringRep = information.getThrowableStrRep();


    int length = 0;


    if (getOption() == null) {
      length = stringRep.length;

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      loggingEvent.setTimeStamp(timeStamp);
      loggingEvent.setLevel(levelImpl);
      loggingEvent.setThreadName(threadName);
      loggingEvent.setMessage(message);
      loggingEvent.setNDC(ndc);
      loggingEvent.setThrowableInformation(new ThrowableInformation(exception));
      loggingEvent.setLocationInformation(info);
      loggingEvent.setProperties(properties);
      
      events.add(loggingEvent);

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    LocationInfo li =
      new LocationInfo(
        "myfile.java", "com.mycompany.util.MyClass", "myMethod", "321");


    ThrowableInformation tsr = new ThrowableInformation(new Exception());


    event = new LoggingEvent();
    event.setLogger(Logger.getLogger("com.mycompany.mylogger"));
    event.setTimeStamp(new Date().getTime());
    event.setLevel(org.apache.log4j.Level.DEBUG);

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    root.debug("%throwable{100}, with exception", ex);


    //
    //  manufacture a pattern to get just the first two lines
    //
    String[] trace = new ThrowableInformation(ex).getThrowableStrRep();
    layout.setConversionPattern("%m%n%throwable{" + (2 - trace.length) + "}");
    layout.activateOptions();
    root.debug("%throwable{-n}, no exception");
    root.debug("%throwable{-n}, with exception", ex);

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