org.apache.logging.log4j.core.LogEvent Java Examples

@Test
public void test() {
	LOGGER.info("This message contains \r\n line feeds");

	// Check the message being logged is correct
	LogEvent nulEvent = appender.getEvents().get(0);

	final String[] options = new String[] { "%msg" };
	final EncodingPatternConverter converter = EncodingPatternConverter
			.newInstance(context.getConfiguration(), options);
	final StringBuilder sb = new StringBuilder();
	converter.format(nulEvent, sb);

	assertTrue(sb.toString().contains(
			"This message contains \\r\\n line feeds"));
}
 

@Test
public void shouldNotAddExceptionToFullMessage() throws InterruptedException {
    // given
    final GelfAppender gelfAppender = createGelfAppender(true, true);
    final LogEvent event = createLogEventMock();
    given(event.getThrown()).willReturn(new RuntimeException("Outer Exception", new Exception("Inner Exception")));

    // when
    gelfAppender.append(event);

    // then
    ArgumentCaptor<GelfMessage> gelfMessageCaptor = ArgumentCaptor.forClass(GelfMessage.class);
    verify(mockedGelfTransport).trySend(gelfMessageCaptor.capture());
    final String fullMessage = gelfMessageCaptor.getValue().getFullMessage();
    assertThat(fullMessage, is("Some Message"));
}
 

@Test
public void testConverterWithKeysAndPrefix() {
    final Message msg = new SimpleMessage("Hello");
    final String [] options = new String[] {"object, subject"};
    final MdcPatternConverter converter = MdcPatternConverter.newInstance(options);
    final LogEvent event = Log4jLogEvent.newBuilder() //
            .setLoggerName("MyLogger") //
            .setLevel(Level.DEBUG) //
            .setMessage(msg) //
            .build();
    final StringBuilder sb = new StringBuilder();
    sb.append("prefix ");
    converter.format(event, sb);
    final String str = sb.toString();
    final String expected = "prefix {object=Log4j, subject=I}";
    assertEquals(expected, str);
}
 

@Test
public void overnightForward() {
    final TimeFilter filter = new TimeFilter(LocalTime.of(23,0), LocalTime.of(2,0),
            ZoneId.of("America/Los_Angeles"), null, null, LocalDate.of(2020, 3, 7));
    filter.start();
    assertTrue(filter.isStarted());
    ZonedDateTime date = ZonedDateTime.of(2020, 3, 7, 23, 30, 30, 0, ZoneId.of("America/Los_Angeles")).withEarlierOffsetAtOverlap();
    CLOCKTIME = date.toInstant().toEpochMilli();
    LogEvent event = Log4jLogEvent.newBuilder().setTimeMillis(CLOCKTIME).build();
    assertSame("Time " + CLOCKTIME + " is not within range: " + filter.toString(), Filter.Result.NEUTRAL, filter.filter(event));
    date = date.plusHours(1);
    CLOCKTIME = date.toInstant().toEpochMilli();
    event = Log4jLogEvent.newBuilder().setTimeMillis(CLOCKTIME).build();
    assertSame("Time " + CLOCKTIME + " is not within range: " + filter.toString(), Filter.Result.NEUTRAL, filter.filter(event));
    date = date.plusHours(2);
    CLOCKTIME = date.toInstant().toEpochMilli();
    event = Log4jLogEvent.newBuilder().setTimeMillis(CLOCKTIME).build();
    assertSame("Time " + CLOCKTIME + " is within range: " + filter.toString(), Filter.Result.DENY, filter.filter(event));
    date = date.plusDays(1).withHour(0);
    CLOCKTIME = date.toInstant().toEpochMilli();
    event = Log4jLogEvent.newBuilder().setTimeMillis(CLOCKTIME).build();
    assertSame("Time " + CLOCKTIME + " is not within range: " + filter.toString(), Filter.Result.NEUTRAL, filter.filter(event));
}
 

@Test
public void defaultIsAdd() {
    final MapRewritePolicy addPolicy = MapRewritePolicy.createPolicy(null, rewrite);
    LogEvent rewritten = addPolicy.rewrite(logEvent0);
    compareLogEvents(logEvent0, rewritten);
    assertEquals("Simple log message changed", logEvent0.getMessage(), rewritten.getMessage());

    rewritten = addPolicy.rewrite(logEvent1);
    compareLogEvents(logEvent1, rewritten);
    checkAdded(((StringMapMessage)rewritten.getMessage()).getData());

    rewritten = addPolicy.rewrite(logEvent2);
    compareLogEvents(logEvent2, rewritten);
    checkAdded(((StructuredDataMessage)rewritten.getMessage()).getData());

    rewritten = addPolicy.rewrite(logEvent3);
    compareLogEvents(logEvent3, rewritten);
    checkAdded(((StringMapMessage)rewritten.getMessage()).getData());
}
 

@Test
public void testLevelMapWithLength() {
    final Message msg = new SimpleMessage("Hello");
    LogEvent event = Log4jLogEvent.newBuilder() //
            .setLoggerName("MyLogger") //
            .setLevel(Level.DEBUG) //
            .setMessage(msg).build();
    final StringBuilder sb = new StringBuilder();
    LevelPatternConverter converter = LevelPatternConverter.newInstance(null);
    converter.format(event, sb);
    assertEquals(Level.DEBUG.toString(), sb.toString());
    final String[] opts = new String[] { "WARN=Warning, length=2" };
    converter = LevelPatternConverter.newInstance(opts);
    sb.setLength(0);
    converter.format(event, sb);
    assertEquals("DE", sb.toString());
    event = Log4jLogEvent.newBuilder() //
            .setLoggerName("MyLogger") //
            .setLevel(Level.WARN) //
            .setMessage(msg).build();
    sb.setLength(0);
    converter.format(event, sb);
    assertEquals("Warning", sb.toString());
}
 

@Test
public void testEqualsMarkerWithMessageSubstitution() throws Exception {
    // replace "[]" with the empty string
    final PatternLayout layout = PatternLayout.newBuilder().setPattern("[%logger]%equals{[%marker]}{[]}{[%msg]}")
        .setConfiguration(ctx.getConfiguration()).build();
    // Not empty marker
    final LogEvent event1 = Log4jLogEvent.newBuilder() //
        .setLoggerName(this.getClass().getName()).setLoggerFqcn("org.apache.logging.log4j.core.Logger") //
        .setLevel(Level.INFO) //
        .setMarker(MarkerManager.getMarker("TestMarker"))
        .setMessage(new SimpleMessage("Hello, world!")).build();
    final byte[] result1 = layout.toByteArray(event1);
    assertEquals("[org.apache.logging.log4j.core.layout.PatternLayoutTest][TestMarker]", new String(result1));
    // empty marker
    final LogEvent event2 = Log4jLogEvent.newBuilder() //
        .setLoggerName(this.getClass().getName()).setLoggerFqcn("org.apache.logging.log4j.core.Logger") //
        .setLevel(Level.INFO)
        .setMessage(new SimpleMessage("Hello, world!")).build();
    final byte[] result2 = layout.toByteArray(event2);
    assertEquals("[org.apache.logging.log4j.core.layout.PatternLayoutTest][Hello, world!]", new String(result2));
}
 

private void test_lineSeparator_suffix(
        final LogEvent logEvent,
        final boolean prettyPrintEnabled) {

    // Create the layout.
    final JsonTemplateLayout layout = JsonTemplateLayout
            .newBuilder()
            .setConfiguration(CONFIGURATION)
            .setEventTemplateUri("classpath:LogstashJsonEventLayoutV1.json")
            .build();

    // Check the serialized event.
    final String serializedLogEvent = layout.toSerializable(logEvent);
    final String assertionCaption = String.format("testing lineSeperator (prettyPrintEnabled=%s)", prettyPrintEnabled);
    assertThat(serializedLogEvent).as(assertionCaption).endsWith("}" + System.lineSeparator());

}
 

public byte[] toByteArray(final LogEvent event) {
  if (event.getMessage().getParameters().length != 1
      || !(event.getMessage().getParameters()[0] instanceof StructuredLogMessage)) {
    throw new IllegalArgumentException(
        "LogEvent must contain a single parameter of type StructuredLogMessage");
  }
  final StructuredLogMessage schemaAndValue
      = (StructuredLogMessage) event.getMessage().getParameters()[0];
  final Struct logRecord = logRecordStructBuilderFactory.get()
      .withLoggerName(event.getLoggerName())
      .withLevel(event.getLevel().name())
      .withTimeMs(event.getTimeMillis())
      .withMessageSchemaAndValue(schemaAndValue.getMessage())
      .build();
  return serializer.apply(logRecord);
}
 

@Test
public void testConverterFullSingle() {
    ThreadContext.clearMap();
    ThreadContext.put("foo", "bar");
    final Message msg = new SimpleMessage("Hello");
    final MdcPatternConverter converter = MdcPatternConverter.newInstance(null);
    final LogEvent event = Log4jLogEvent.newBuilder() //
            .setLoggerName("MyLogger") //
            .setLevel(Level.DEBUG) //
            .setMessage(msg) //
            .build();
    final StringBuilder sb = new StringBuilder();
    converter.format(event, sb);
    final String str = sb.toString();
    final String expected = "{foo=bar}";
    assertTrue("Incorrect result. Expected " + expected + ", actual " + str, str.equals(expected));
}
 

@Test
public void testAppend_Simple() {
    SystemdJournalAppender journalAppender = new SystemdJournalAppender("Journal", null, null, false, journalLibrary,
            false, false, false, false, false, false, null, null, null);

    when(message.getFormattedMessage()).thenReturn("some message");
    LogEvent event = new Log4jLogEvent.Builder().setMessage(message).setLevel(Level.INFO).build();

    journalAppender.append(event);

    List<Object> expectedArgs = new ArrayList<>();
    expectedArgs.add("some message");
    expectedArgs.add("PRIORITY=%d");
    expectedArgs.add(6);
    expectedArgs.add(null);

    verify(journalLibrary).sd_journal_send("MESSAGE=%s", expectedArgs.toArray());
}
 

/**
 * {@inheritDoc}
 */
@Override
public void format(final LogEvent event, final StringBuilder toAppendTo) {
    int start = 0;
    int end = 0;
    if (!noAnsi) { // use ANSI: set prefix
        start = toAppendTo.length();
        toAppendTo.append(style);
        end = toAppendTo.length();
    }

    //noinspection ForLoopReplaceableByForEach
    for (int i = 0, size = patternFormatters.size(); i <  size; i++) {
        patternFormatters.get(i).format(event, toAppendTo);
    }

    // if we use ANSI we need to add the postfix or erase the unnecessary prefix
    if (!noAnsi) {
        if (toAppendTo.length() == end) {
            toAppendTo.setLength(start); // erase prefix
        } else {
            toAppendTo.append(defaultStyle); // add postfix
        }
    }
}
 

@Test
public void shouldNotAppendExceptionInformationIfNotRequested() throws InterruptedException {
    // given
    final GelfAppender gelfAppender = createGelfAppender(false, false);
    final LogEvent event = createLogEventMock();
    given(event.getThrown()).willReturn(new RuntimeException("Outer Exception", new Exception("Inner Exception")));

    // when
    gelfAppender.append(event);

    // then
    ArgumentCaptor<GelfMessage> gelfMessageCaptor = ArgumentCaptor.forClass(GelfMessage.class);
    verify(mockedGelfTransport).trySend(gelfMessageCaptor.capture());
    final Object exceptionMessage = gelfMessageCaptor.getValue()
            .getAdditionalFields()
            .get("exceptionMessage");
    final Object exceptionClass = gelfMessageCaptor.getValue()
            .getAdditionalFields()
            .get("exceptionClass");
    final Object exceptionStackTrace = gelfMessageCaptor.getValue()
            .getAdditionalFields()
            .get("exceptionStackTrace");
    assertThat(exceptionMessage, nullValue());
    assertThat(exceptionClass, nullValue());
    assertThat(exceptionStackTrace, nullValue());
}
 

@Test
public void testFormatLogEventStringBuilderIso8601() {
    final LogEvent event = new MyLogEvent();
    final DatePatternConverter converter = DatePatternConverter.newInstance(ISO8601_FORMAT_OPTIONS);
    final StringBuilder sb = new StringBuilder();
    converter.format(event, sb);

    final String expected = "2011-12-30T10:56:35,987";
    assertEquals(expected, sb.toString());
}
 

/**
 * Tests logger.trace(Object, Exception).
 */
@Test
public void testTraceWithException() {
    final ListAppender appender = new ListAppender("List");
    appender.start();
    final Logger root = Logger.getRootLogger();
    try {
        ((org.apache.logging.log4j.core.Logger) root.getLogger()).addAppender(appender);
        root.setLevel(Level.INFO);

        final Logger tracer = Logger.getLogger("com.example.Tracer");
        tracer.setLevel(Level.TRACE);
        final NullPointerException ex = new NullPointerException();

        tracer.trace("Message 1", ex);
        root.trace("Discarded Message", ex);
        root.trace("Discarded Message", ex);

        final List<LogEvent> msgs = appender.getEvents();
        assertEquals(1, msgs.size());
        final LogEvent event = msgs.get(0);
        assertEquals(org.apache.logging.log4j.Level.TRACE, event.getLevel());
        assertEquals("Message 1", event.getMessage().getFormattedMessage());
        appender.stop();
    } finally {
        ((org.apache.logging.log4j.core.Logger) root.getLogger()).removeAppender(appender);
    }
}
 

@Test
public void testLookup() {
    final StrLookup lookup = new DateLookup();
    final LogEvent event = new MyLogEvent();
    final String value = lookup.lookup(event, "MM/dd/yyyy");
    assertNotNull(value);
    assertEquals("12/30/2011", value);
}
 

@Override
public StringBuilder toSerializable(final LogEvent event, final StringBuilder buffer) {
    final PatternFormatter[] formatters = patternSelector.getFormatters(event);
    final int len = formatters.length;
    for (int i = 0; i < len; i++) {
        formatters[i].format(event, buffer);
    }
    if (replace != null) { // creates temporary objects
        String str = buffer.toString();
        str = replace.format(str);
        buffer.setLength(0);
        buffer.append(str);
    }
    return buffer;
}
 

/**
 * Formats a {@link org.apache.logging.log4j.core.LogEvent}.
 *
 * @param event The LogEvent.
 * @return The XML representation of the LogEvent.
 */
@Override
public String toSerializable(final LogEvent event) {
    String loggerName = event.getLoggerName();
    String level = event.getLevel().toString();
    String message = event.getMessage().getFormattedMessage();
    if (!message.startsWith("{") && !message.startsWith("[")) {
        message = "\"" + message + "\"";
    }
    String threadName = event.getThreadName();
    Date timeStamp = new Date(event.getTimeMillis());
    String context = Context.toJSON();

    Throwable throwable = event.getThrown();

    String exception = "";
    if (throwable != null) {
        exception = ",\"exception\":{\"message\":\"";
        String exceptionMessage = throwable.getMessage() != null ? throwable.getMessage() : "";
        //need to be careful here, sanitizing, since the message may already contain a chunk of JSON, so escaping or cleaning double quotes is not prudent:)
        exception += sanitize(exceptionMessage, false, '\n', '\t', '\r') + "\",\"stacktrace\":\"" + escapeControlChars(Util.getStackTraceString(throwable)) + "\"}";
    }

    String contextJson = context != null ? ",\"context\":" + context : "";

    String timestampString = this.simpleDateFormat == null ? timeStamp.toString() : simpleDateFormat.format(timeStamp);

    return "{\"level\":\"" + level + "\",\"timestamp\":\"" + timestampString
            + "\",\"thread\":\"" + threadName + "\",\"logger\":\"" + loggerName + "\",\"message\":"
            + message + contextJson + exception + "}" + System.getProperty("line.separator");
}
 

@Test
public void testConverterAppendsLogEventNanoTimeToStringBuilder() {
    final LogEvent event = Log4jLogEvent.newBuilder() //
            .setThreadId(1).build();
    final StringBuilder sb = new StringBuilder();
    final ThreadIdPatternConverter converter = ThreadIdPatternConverter.newInstance(null);
    converter.format(event, sb);
    assertEquals("1", sb.toString());
}
 

private boolean handleInterruptedException(final LogEvent memento) {
    final boolean appendSuccessful = queue.offer(memento);
    if (!appendSuccessful) {
        LOGGER.warn("Interrupted while waiting for a free slot in the AsyncAppender LogEvent-queue {}",
            getName());
    }
    // set the interrupted flag again.
    Thread.currentThread().interrupt();
    return appendSuccessful;
}
 

private static <K> Map<K, Object> appendAndCollect(
        final List<LogEvent> logEvents,
        final Layout<?> layout,
        final int port,
        final Function<Map<String, Object>, K> keyMapper,
        final Set<String> excludedKeys) throws IOException {
    try (final RestHighLevelClient client = createClient()) {
        final Appender appender = createStartedAppender(layout, port);
        try {

            // Append the event.
            LOGGER.info("appending events");
            logEvents.forEach(appender::append);
            LOGGER.info("completed appending events");

            // Wait the message to arrive.
            Awaitility
                    .await()
                    .atMost(Duration.ofSeconds(60))
                    .pollDelay(Duration.ofSeconds(2))
                    .until(() -> queryDocumentCount(client) == LOG_EVENT_COUNT);

            // Retrieve the persisted messages.
            return queryDocuments(client)
                    .stream()
                    .collect(Collectors.toMap(
                            keyMapper,
                            (final Map<String, Object> source) -> {
                                excludedKeys.forEach(source::remove);
                                return source;
                            }));

        } finally {
            appender.stop();
        }
    }
}
 

private static void resolveString(
        final String fallbackKey,
        final LogEvent logEvent,
        final JsonWriter jsonWriter) {
    final Message message = logEvent.getMessage();
    resolveString(fallbackKey, message, jsonWriter);
}
 

protected String serializeToString(final Serializer serializer) {
    if (serializer == null) {
        return null;
    }
    final LoggerConfig rootLogger = getConfiguration().getRootLogger();
    // Using "" for the FQCN, does it matter?
    final LogEvent logEvent = getLogEventFactory().createEvent(rootLogger.getName(), null, Strings.EMPTY,
            rootLogger.getLevel(), null, null, null);
    return serializer.toSerializable(logEvent);
}
 

private void testMdcPattern(final String patternStr, final String expectedStr, final boolean useThreadContext)
        throws Exception {
    final PatternLayout layout = PatternLayout.newBuilder().setPattern(patternStr)
            .setConfiguration(ctx.getConfiguration()).build();
    if (useThreadContext) {
        ThreadContext.put("key1", "value1");
        ThreadContext.put("key2", "value2");
    }
    final LogEvent event = Log4jLogEvent.newBuilder() //
            .setLoggerName(this.getClass().getName()).setLoggerFqcn("org.apache.logging.log4j.core.Logger") //
            .setLevel(Level.INFO) //
            .setMessage(new SimpleMessage("Hello")).build();
    assertToByteArray(expectedStr, layout, event);
    assertEncode(expectedStr, layout, event);
}
 

public LogSearchJsonLayout(Charset charset) {
  super(charset);
  SimpleModule module = new SimpleModule();
  module.addSerializer(LogEvent.class, new LogEventSerializer());
  module.addSerializer(ReadOnlyStringMap.class, new ContextDataSerializer() {
  });
  objectMapper = new ObjectMapper();
  objectMapper.registerModule(module);
  objectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
}
 

/**
 * {@inheritDoc}
 */
@Override
public void format(final LogEvent event, final StringBuilder toAppendTo) {
    final int start = toAppendTo.length();
    for (int i = 0; i < formatters.size(); i++) {
        formatters.get(i).format(event, toAppendTo);
    }
    escapeFormat.escape(toAppendTo, start);
}
 

/**
 * {@inheritDoc}
 */
@Override
public String getStyleClass(final Object e) {
    if (e instanceof LogEvent) {
        return "level " + ((LogEvent) e).getLevel().name().toLowerCase(Locale.ENGLISH);
    }

    return "level";
}
 

@Test
public void messageOnlyItemSourceLayout() {

    // given
    ItemAppenderFactory factory = new ItemAppenderFactory();
    String formattedIndexName = UUID.randomUUID().toString();
    BatchDelivery batchDelivery = mock(BatchDelivery.class);

    ItemSourceLayout itemSourceLayout = spy(new TestItemSourceLayout());
    ItemSourceAppender itemAppender =
            factory.createInstance(true, itemSourceLayout, batchDelivery);

    String expectedMessage = UUID.randomUUID().toString();
    ItemSource itemSource = new StringItemSource(expectedMessage);
    when(itemSourceLayout.serialize(any(Message.class))).thenReturn(itemSource);

    LogEvent logEvent = mock(LogEvent.class);
    Message message = mock(Message.class);

    when(logEvent.getMessage()).thenReturn(message);

    // when
    itemAppender.append(formattedIndexName, logEvent);

    // then
    assertEquals(ItemSourceAppender.class, itemAppender.getClass());

    verify(itemSourceLayout).serialize(messageCaptor.capture());
    assertEquals(message, messageCaptor.getValue());

    verify(batchDelivery).add(indexNameCaptor.capture(), itemSourceCaptor.capture());
    assertEquals(formattedIndexName, indexNameCaptor.getValue());
    assertEquals(expectedMessage, itemSourceCaptor.getValue().getSource());

}
 

private String getLogMessage(LogEvent logEvent) {
  String logMessage = logEvent.getMessage() != null ? logEvent.getMessage().getFormattedMessage() : "";
  if (logEvent.getThrown() != null) {
    logMessage += NEW_LINE;
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    logEvent.getThrown().printStackTrace(pw);
    logMessage += sw.toString();
  }
  return logMessage;
}
 

/**
 * Looks up the value of the JNDI resource.
 * @param event The current LogEvent (is ignored by this StrLookup).
 * @param key  the JNDI resource name to be looked up, may be null
 * @return The String value of the JNDI resource.
 */
@Override
public String lookup(final LogEvent event, final String key) {
    if (key == null) {
        return null;
    }
    final String jndiName = convertJndiName(key);
    try (final JndiManager jndiManager = JndiManager.getDefaultManager()) {
        return Objects.toString(jndiManager.lookup(jndiName), null);
    } catch (final NamingException e) {
        LOGGER.warn(LOOKUP, "Error looking up JNDI resource [{}].", jndiName, e);
        return null;
    }
}