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


  /**
   * {@inheritDoc}
   */
  public void format(final LoggingEvent event, final StringBuffer toAppendTo) {
    ThrowableInformation information = event.getThrowableInformation();


    if (information != null) {
      String[] stringRep = information.getThrowableStrRep();


      int length = 0;


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

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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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   * @return the writer
   * @throws IOException on problems generating the JSON
   */
  public Writer toJson(final Writer writer, final LoggingEvent event)
      throws IOException {
    ThrowableInformation ti = event.getThrowableInformation();
    toJson(writer,
           event.getLoggerName(),
           event.getTimeStamp(),
           event.getLevel().toString(),
           event.getThreadName(),

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  }
  
  public int countExceptionsWithMessage(final String text) {
    int count = 0;
    for (LoggingEvent e: getLog()) {
      ThrowableInformation t = e.getThrowableInformation();
      if (t != null) {
        String m = t.getThrowable().getMessage();
        if (m.contains(text)) {
          count++;
        }
      }
    }

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                         + expectedMessageExpression);
                }
            } // else they are both null


            // Check the exception ...
            ThrowableInformation throwableInfo = event.getThrowableInformation();
            if (expectedExceptionClass == null && throwableInfo != null) {
                fail("Log line " + lineNumber + " had unexpected exception: "
                     + event.getThrowableInformation().getThrowableStrRep());
            } else if (expectedExceptionClass != null && throwableInfo == null) {
                fail("Log line " + lineNumber + " was missing expected exception of type "
                     + expectedExceptionClass.getCanonicalName());
            } else if (expectedExceptionClass != null && throwableInfo != null) {
                Throwable actualException = throwableInfo.getThrowable();
                assertSame(expectedExceptionClass, actualException.getClass());
            } // else they are both null
        }

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  /**
   * {@inheritDoc}
   */
  public void format(final LoggingEvent event, final StringBuffer toAppendTo) {
    ThrowableInformation information = event.getThrowableInformation();


    if (information != null) {
      String[] stringRep = information.getThrowableStrRep();


      int length = 0;


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

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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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    ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
    PrintStream out = new PrintStream(byteOut);
    out.println(event.getMessage());
    out.println();


    ThrowableInformation throwableInfo = event.getThrowableInformation();
    if (throwableInfo != null) {
      Throwable thrown = throwableInfo.getThrowable();
      thrown.printStackTrace(out);
    }
    out.close();


    textArea.setText(new String(byteOut.toByteArray()));

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                         + expectedMessageExpression);
                }
            } // else they are both null


            // Check the exception ...
            ThrowableInformation throwableInfo = event.getThrowableInformation();
            if (expectedExceptionClass == null && throwableInfo != null) {
                fail("Log line " + lineNumber + " had unexpected exception: "
                     + event.getThrowableInformation().getThrowableStrRep());
            } else if (expectedExceptionClass != null && throwableInfo == null) {
                fail("Log line " + lineNumber + " was missing expected exception of type "
                     + expectedExceptionClass.getCanonicalName());
            } else if (expectedExceptionClass != null && throwableInfo != null) {
                Throwable actualException = throwableInfo.getThrowable();
                assertSame(expectedExceptionClass, actualException.getClass());
            } // else they are both null
        }

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      return Filter.NEUTRAL;
    }


    String msg = event.getRenderedMessage();


    ThrowableInformation throwableInfo = event.getThrowableInformation();
    String[] renderedThrowable = null;


    if(throwableInfo != null)
    {
      renderedThrowable = throwableInfo.getThrowableStrRep();
    }


    if((msg == null && renderedThrowable == null) || getStringToMatch() == null)
      return Filter.NEUTRAL;

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