Does anyone knows the default format pattern for Dropwizard 0.7.1 logging, if no logFormat is configured?
I need sth like:
%d{HH:mm:ss.SSS} %-5level [%X{id}] [%X{format}] [%thread]: %class{0}::%method:%line - %msg%n
Logback uses implementations of the Layout interface's doLayout() method to translate logging events to Strings that can be output, as outlined in the documentation. Dropwizard provides an extension to the PatternLayout class (which is in turn an extension of the abstract PatternLayoutBase class):
PatternLayout takes a logging event and returns a String. However,
this String can be customized by tweaking PatternLayout's conversion
pattern.
public class DropwizardLayout extends PatternLayout {
public DropwizardLayout(LoggerContext context, TimeZone timeZone) {
super();
setOutputPatternAsHeader(false);
getDefaultConverterMap().put("ex", PrefixedThrowableProxyConverter.class.getName());
getDefaultConverterMap().put("xEx", PrefixedExtendedThrowableProxyConverter.class.getName());
getDefaultConverterMap().put("rEx", PrefixedRootCauseFirstThrowableProxyConverter.class.getName());
setPattern("%-5p [%d{ISO8601," + timeZone.getID() + "}] %c: %m%n%rEx");
setContext(context);
}
}
What this does is:
Ensures that outputPatternAsHeader is disabled, which is a flag that outputs the String pattern that you want at the top of any logs. One way to confirm the pattern used could be to enable this flag on your appender, as outlined in the logback documentation.
Overrides a number of conversion words related to printing exceptions to use an implementation of ThrowableProxyConverter that prefixes the stack trace with exclamation marks.
Set the pattern to be "%-5p [%d{ISO8601," + timeZone.getID() + "}] %c: %m%n%rEx", using the timezone passed in. If you don't add the timezone information explicitly, logback will use the JVM's timezone, or else GMT. If this is acceptable, you could just use %d, as the ISO8601 format is the default.
Sets the context.
Related
I am looking for rollover strategy where current log (active output target in manual's terminology) file name is not fixed but specified by a pattern, or - more precisely - same pattern as in filePattern attribute.
I want to achieve daily rollover where today's log is, say, log-2015-05-05.log and on midnight framework just stops writing it and starts writing into log-2015-05-06.log. However, AFAIK, current configuration allows only
<RollingFile name="ROLFILE"
fileName="log.log"
filePattern="log-%d{yyyy-MM-dd}.log"
>
Specifying same value into fileName attribute doesn't work (leads to file with sensitive characters literally interpreted). I noticed no example or SO question with such a dynamic value of fileName. Note the fileName="log-${date:yyyy-MM-dd}.log" doesn't solve problem since expression is evaluated only at startup and events are still sent into file even if their timestamp doesn't match the expression.
I am migrating from Log4j 1.2 to Log4j 2.2. In old version, required behavior was possible using
<appender name="ROLFILE" class="org.apache.log4j.rolling.RollingFileAppender">
<rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
<param name="FileNamePattern" value="log-%d{yyyy-MM-dd}.log" />
</rollingPolicy>
...
I prefer to preserve current way since some log analyzing tools rely on it.
Is it possible in Log4j2?
Thanks.
Note sure if this works, but you can try using a double $$ in the date lookup. This allows the variable to be resolved at runtime.
<RollingFile name="ROLFILE"
fileName="log-$${date:yyyy-MM-dd}.log"
filePattern="oldlog-%d{yyyy-MM-dd}.log"
>
You may need to be careful to ensure that the active output target file name is different from the after-rollover file name. (I used 'oldlog' in the snippet above.)
Finally, I wrote my own rollover strategy which generates different set of rollover actions. Instead renaming active file the active file name is simply replaced inside RollingFileManager. Yes, it's ugly reflection hack and also appender must be initialized with fileName constant corresponding with current date and having same pattern, e.g.
<RollingFile name="ROLFILE"
fileName="log-${date:yyyy-MM-dd}.log"
filePattern="log-%d{yyyy-MM-dd}.log"
>
<SlidingFilenameRolloverStrategy />
...
yet for me this solution is worth doing it despite these small drawbacks.
(Initial fileName stays forever as a key in AbstractManager registry MAP even if in manager itself it has been changed - seems it doesn't mind, I also tried replacing manager in registry for new one but it's impossible to collect all parameters necessary for its construction.)
I hope this hack shouldn't have been so ugly if RollingFileManager API made it possible normal way. I got some hope seeing this javadoc but framework AFAIK never utilizes this field, let alone for mutating RollingFileAppender.
I think it would work just fine using:
fileName="log-${date:yyyy-MM-dd}.log"
filePattern="log-%d{yyyy-MM-dd}.log"
I use it with log4j2 version 2.5
This has been implemented in Log4j 2.8 (see issue LOG4J2-1101).
Currently it only works with a RollingFile appender by omitting the filename parameter and using a DirectWriteRolloverStrategy.
Also, this feature seems to have some issues with the TimeBasedTriggeringPolicy (the first rollover doesn't happen so every logfile is offset by one interval); CronTriggeringPolicy works properly.
Example config:
<RollingRandomAccessFile name="MyLogger"
filePattern="logs/application.%d{yyyy-MM-dd}.log">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
<Policies>
<CronTriggeringPolicy schedule="0 * * * * ?" evaluateOnStartup="true"/>
</Policies>
<DirectWriteRolloverStrategy/>
</RollingRandomAccessFile>
Support for RollingRandomAccessFile appender is requested in issue LOG4J2-1878.
Edit: Changed to CronTriggeringPolicy policy after finding TimeBasedTriggeringPolicy had issues.
I am using slf4j for logging in my Java Application. It involves a lot logging and log monitoring.
Sometimes it is really difficult to read and find information from logs when the entire log is printed in the black color with.
Just to make it more readable, is it possible to log the different kinds of messages in different colors?
For example all Error level messages in Red color or a different font size and all Info level messages in blue color and a different font size.
Any suggestions or help is welcome.
Thnx.
It's not possible to change colors of slf4j logging, because there are no formatters. SLF4J is a middleware between your application and some logging facility, for example, Log4j or Logback.
You can change colors in Log4j output, as explained here. I would recommend to use MulticolorLayout from jcabi-log
Something you have to bear in mind.
First, SLF4J is only a logging facade. How the actual log message is handled depends on the binding it used. Therefore your question is invalid, instead, you should quote which implementation you want to use (LogBack? Log4J? etc)
Second, "Coloring" is not something meaningful in most case. For example, if you are referring a plain text log file, there is nothing that we can control the coloring because they are all plain text (unless your editor have special syntax highlighting built-in for your log message format). It may be meaningful if you want to see the color in the console/terminal, or if you are outputting your log into file format that allow you to contain color information (e.g. HTML).
With these two idea in mind, here is my suggestion.
LogBack has built-in support for coloring http://logback.qos.ch/manual/layouts.html#coloring in console output. If you are looking for way to see color in console output, and you are allowed to use LogBack, this is what you are looking for.
Two solutions come to my mind. They are not colors, but alternative solutions:
In your File Appender configuration, you can configure the pattern to include the log level (error, warn, etc). Then you can grep the file, to filter messages by level.
You can configure two file appenders (for two separate log files) with different level threshold. For instance, one would log all the logs above debug level (so info, warn, error) into let's say logs.txt and the other would log only the errors logs into errors.txt
Hope it helps.
Add next appender into logback.xml to colorize logs output:
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<!-- encoders are assigned the type
ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
<encoder>
<Pattern>%d %highlight(%-5level) [%thread] %cyan(%logger{15}): %msg%n</Pattern>
</encoder>
</appender>
In addition to using a colored ConsoleAppender, you could also color the statement itself. Note this has limitations and may not work with all systems. It worked well for internal projects, particularly when you want to log that a major task in a chain is complete or simply while debugging errors.
To quote an external link:
System.out.println("\u001B[31m" + "the text is red" + "\u001B[0m");
\u001B[31m is the ANSI code to color the output red and \u001B[31m is the ANSI reset command.
public class ColorLogger {
private static final Logger LOGGER = LoggerFactory.getLogger(ColorLogger.class);
public void logDebug(String logging) {
LOGGER.debug("\u001B[34m" + logging + "\u001B[0m");
}
public void logInfo(String logging) {
LOGGER.info("\u001B[32m" + logging + "\u001B[0m");
}
public void logError(String logging) {
LOGGER.error("\u001B[31m" + logging + "\u001B[0m");
}
}
In your case, it sounds like you can try to write the contents of the aggregated log out and optionally color each statement by finding each string that concerns you.
This can alternatively just be done by printing it to an HTML page and using CSS selectively on your text.
I use filters for both logging level and package. This example comes from Spring boot application.properties
logging.level.root=warn
logging.level.org.springframework=warn
logging.level.org.hibernate=warn
logging.level.org.starmonkey.brown=DEBUG
This way I see only messages I want to see
I am writing a command line tool that performs a number of tests to our servers and reports an output to screen.
I am currently using log4j to print to screen and to a log file.
However, I was wondering if there was a better technique to manage all the printing from one class instead of having the "print" commands scattered all over my code.
e.g.
logger.info("Connecting to environment: " + envName);
if (cmd.hasOption(OPTION_CHECK_PRIMARY)) {
//print primary leg
String primaryLegName = env.getPrimaryLeg().getLegName();
String message = "is primary";
logger.info(String.format("%s : %-4s %s", envName, primaryLegName, message));
}
This is an example of the output that is now scattered across all my code.
Would it be best to have a Formatter class that handles all the printing?
What is the best approach to create it?
What do you think about something like:
Formatter pf = new PlainFormatter();
...
pf.printEnvironment(envName);
if (cmd.hasOption(OPTION_CHECK_PRIMARY)) {
//print primary leg
String primaryLegName = env.getPrimaryLeg().getLegName();
pf.printPrimary(envName, primaryLegName);
}
Have you tried using log4j.properties to format the text. I think if you are trying to format uniquely for each class, then this is still possible using log4j.properties.
Here is a simple example of log4j.properties
log4j.rootLogger=INFO, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
You can use Pattern in properties like so:
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
log4j has appenders to redirect log messages to different locations. quote" Multiple appenders exist for the console, files, GUI components, remote socket servers, JMS, NT Event Loggers, and remote UNIX Syslog daemons "unquote
I have a project that uses Apache Commons Logging & log4j with a large number of classes doing logging. 95% of my logs show up with the same prefix
log4j.appender.MyCompany.layout.ConversionPattern=[%d][%-5p][%c] %m%n
[2010-08-05 11:44:18,940][DEBUG][com.mycompany.projectname.config.XMLConfigSource] Loading config from [filepath]
[2010-08-05 12:05:52,715][INFO ][com.mycompany.projectname.management.ManagerCore] Log entry 1
[2010-08-05 12:05:52,717][INFO ][com.mycompany.projectname.management.ManagerCore] Log entry 2
I know with %c{1}, I can just show the last part of the category (i.e. the class name), but is there a way to trim off the common portion 'com.mycompany.projectname' from each log under that package, considering how much room it takes up on each line?
If you are using Log4j 1.2.16, you can change your layout to EnhancedPatternLayout, which lets you specify a negative value for the category parameter. From the docs:
For example, for the category name "alpha.beta.gamma" ... %c{-2} will remove two elements [from the front] leaving "gamma"
Here is a more complete example:
log4j.appender.C.layout=org.apache.log4j.EnhancedPatternLayout
log4j.appender.C.layout.ConversionPattern=%d{ABSOLUTE} %-5p [%t] [%c{-3}] %m%n
which in your case should chop off com.mycompany.projectname.
However, this will apply to every message that is logged, even if it didn't come from your code. In other words, the category org.hibernate.engine.query.HQLQueryPlan would be trimmed to query.HQLQueryPlan, which may not be what you want.
If you need absolute control over this (i.e. you want to specifically strip out the text "com.mycompany.projectname" from every message), then you will need to implement your own Layout class. Something like this should do it:
import org.apache.log4j.PatternLayout;
import org.apache.log4j.spi.LoggingEvent;
public class MyPatternLayout extends PatternLayout
{
#Override
public String format(LoggingEvent event)
{
String msg = super.format(event);
msg = msg.replace("com.mycompany.projectname", "");
return msg;
}
}
Good luck!
Use %c{2} or %C{2}. The number specifies the number of right-most components to keep.
Refer to http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html.
i configured log4j for basic purpose usin the conversion pattern :-
log4j.appender.rollingFile.layout.ConversionPattern=%p %t %c - %m%n
But now i want to log the class name from which the error came as well as the username(available in session object) as well as the date and time when that event occurs. How do i do this? What changes do i need to make in format string?
Thanks in advance :)
Take a look at the PatternLayout docs for most of what you want.
The headache you face is getting the user name from the session (Log4j can't do this automatically). I would perhaps investigate NDCs or MDCs, and populate these from the session (perhaps in a servlet filter?). They are per-thread, so assuming your user has the same scope then this may help.
To get the class name out you can use %l, but you'll take a bit of performance hit.
To get the username out, you'll need to use a mapped or nested diagnostic context and then specificy %X or %x respectively in the pattern string.
Check the PatternLayout javdocs.