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

    public void doAppend( LoggingEvent event )
    {
        m_output = true;
        m_priority = event.getLevel();
        m_message = (String)event.getMessage();
        final ThrowableInformation information = event.getThrowableInformation();
        if( null != information )
        {
            m_throwable = information.getThrowable();
        }
    }

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  @Override
  protected void append(final LoggingEvent loggingEvent) {
    final StringBuilder buf = new StringBuilder();
    buf.append(getLayout().format(loggingEvent));
    final ThrowableInformation ti = loggingEvent.getThrowableInformation();


    if (ti != null) {
      final String[] cause = ti.getThrowableStrRep();


      for (final String line : cause) {
        buf.append(line).append('\n');
      }
    }

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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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            String renderedMessage = event.getRenderedMessage();
            if (renderedMessage != null)
            {
                message.append(renderedMessage);
            }
            ThrowableInformation ti = event.getThrowableInformation();
            if (ti != null)
            {
                Throwable t = ti.getThrowable();
                if (t != null)
                {
                    if (message.length() > 0)
                    {
                        message.append(":");

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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.setProperties(properties);
      
      events.add(loggingEvent);
     
      logger = null;

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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 (option == null) {
      length = stringRep.length;

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                            message, null);
                    event.setLocationInformation(new LocationInfo(fileName,
                            className, methodName, lineNumber));
                    properties.putAll(mdc);
                    event.setTimeStamp(timeStamp);
                    event.setThrowableInformation(new ThrowableInformation(
                            exception));


                    event.setProperties(properties);
                    event.setThreadName(threadName);
                    event.setNDC(ndc);

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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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         */
        logstashEvent.put("source_host", hostname);
        logstashEvent.put("message", loggingEvent.getRenderedMessage());


        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);
            }
            addEventData("exception", exceptionInformation);
        }

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