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


  @Test
  public void testException() throws Throwable {
    Exception e =
        new NoRouteToHostException("that box caught fire 3 years ago");
    ThrowableInformation ti = new ThrowableInformation(e);
    Log4Json l4j = new Log4Json();
    long timeStamp = Time.now();
    String outcome = l4j.toJson(new StringWriter(),
        "testException",
        timeStamp,

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  @Test
  public void testNestedException() throws Throwable {
    Exception e =
        new NoRouteToHostException("that box caught fire 3 years ago");
    Exception ioe = new IOException("Datacenter problems", e);
    ThrowableInformation ti = new ThrowableInformation(ioe);
    Log4Json l4j = new Log4Json();
    long timeStamp = Time.now();
    String outcome = l4j.toJson(new StringWriter(),
        "testNestedException",
        timeStamp,

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    protected LogEvent toLogEvent(LoggingEvent element) {
        LogEvent answer = new LogEvent();
        answer.setClassName(element.getFQNOfLoggerClass());
        // TODO
        //answer.setContainerName(element.get);
        ThrowableInformation throwableInformation = element.getThrowableInformation();
        if (throwableInformation != null) {
            ThrowableFormatter renderer = new ThrowableFormatter();
            String[] stack = renderer.doRender(throwableInformation.getThrowable());
            if (stack == null) {
                stack = element.getThrowableStrRep();
            }
            answer.setException(stack);
        }

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        return new Object[0];
    }


    @Override
    public Throwable getThrowable() {
        ThrowableInformation ti = loggingEvent.getThrowableInformation();
        if (ti != null) {
            return ti.getThrowable();
        }


        return null;
    }

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        if (!levelEnabled(level)) {
            return;
        }


        String message = event.getRenderedMessage();
        ThrowableInformation info = event.getThrowableInformation();
        Throwable throwable = info != null ? info.getThrowable() : null;
        if (message != null) {
            if (throwable == null) {
                log(level, message);
            } else {
                log(level, message, throwable);

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        return getLevel(event);
    }


    @Override
    public Throwable getThrowable() {
        final ThrowableInformation ti = event.getThrowableInformation();
        if (ti != null) return ti.getThrowable();
        else return null;
    }

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          synchronized (layoutMutex) {
            msgBody = new StringBuilder(layout.format(logEvent));
            routingKey = routingKeyLayout.format(logEvent);
          }
          if (layout.ignoresThrowable() && null != logEvent.getThrowableInformation()) {
            ThrowableInformation tinfo = logEvent.getThrowableInformation();
            for (String line : tinfo.getThrowableStrRep()) {
              msgBody.append(String.format("%s%n", line));
            }
          }


          // Send a message

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