I have a Spring boot application and I'm using logback as the framework for logging. Currently I want to display thread id instead of the thread name. I know it is possible using log4j2 if you use %tid .
Can I achieve the same using logback or should I implement a Custom Thread ID extractor?
I'm extending PatternLayout class and creating a map which has the thread id and it's value. How do I use this key in my logback.xml
By document of log4j2, you can use Pattern Layout as you know already.
so just write %t on your configuration file in logback.xml
reference document : Link and find Outputs the ID of the thread that generated the logging event.
In my case I use like this
<Configuration>
...
<Appenders>
...
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] [%-5level] %logger{36} - %msg%n"/>
...
</Appenders>
...
</Configuration>
This can be done with a custom ClassicConverter, such as:
import ch.qos.logback.classic.pattern.ClassicConverter;
import ch.qos.logback.classic.spi.ILoggingEvent;
public class ThreadIdConverter extends ClassicConverter {
#Override
public String convert(final ILoggingEvent e) {
return String.valueOf(Thread.currentThread().getId());
}
}
Then, in your logback.xml:
<configuration>
<conversionRule conversionWord="threadId" converterClass="ThreadIdConverter"/>
...
<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%threadId %msg%n</pattern>
</encoder>
</appender>
...
</configuration>
Related
I am trying to write one custom starter in sprintboot for logging. So that all downstream project can follow the same pattern of logging on adding starter in class path.
For this I am trying to create one logback.xml file and using LogstashEncoder.
In this project I am using sleuth and zipking also so that I can see the traceId and spanId.
Following is the logback.xml file.
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<include resource="org/springframework/boot/logging/logback/console.xml"/>
<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>
%d{yyyy-MM-dd HH:mm:ss.SSS} %5p [Orders:%thread:%X{X-B3-TraceId}:%X{X-B3-SpanId}] %logger{40} - %msg%n
</pattern>
</encoder>
</appender>
<appender name="fileout"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>c:/elk/orders4.log</File>
<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<maxIndex>8</maxIndex>
<FileNamePattern>./logs/orders.log.%i
</FileNamePattern>
</rollingPolicy>e
<triggeringPolicy
class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>128MB</MaxFileSize>
</triggeringPolicy>
<encoder class="net.logstash.logback.encoder.LogstashEncoder">
<customFields>{"tenantId":"log-odyssey"}</customFields>
</encoder>
</appender>
<root level="info">
<appender-ref ref="fileout" />
<appender-ref ref="stdout" />
</root>
</configuration>
Now If you will see in RollingFileAppender I am using one custom field with hardcode value.
I want to populate its value dynamically from http request. as tenantId will be resolved from request itself.
Can someone help me to solve this issue how I can populate custom fields value dynamically.
Create a Servlet Filter that retrieves the tenantId from the request and populates the tenantId property in the logback MDC. LogstashEncoder will automatically include all properties from the MDC in the JSON output for a log event. You don't even need to define a custom field in xml.
i am upgrading from log4j to log4j2 and new to log4j in general. I am finding it difficult to introduce lengthy loggers for every class file in the log4j2.properties file. For instance, if i had to create a new logger in log4j, it would be as simple as introducing a single line in the log4j.properties file compared to a whole block of properties against the same logger.
Ex:- If i have to add a logger for a class2 in package A, i would simply add it as follows :-
log4j.logger.A.Class1= DEBUG,file
log4j.logger.A.Class2 = DEBUG,file.
I can easily add another logger by simply introducing a third line in the log4j.properties file.
Whereas, if i have to do the same thing, i would have to add the loggers as below :-
loggers=file1,file2
logger.file1.name=A.Class1
logger.file1.level = debug
logger.file1.appenderRefs = file
logger.file1.appenderRef.file.ref = LOGFILE
logger.file2.name=A.Class2
logger.file2.level = debug
logger.file2.appenderRefs = file
logger.file2.appenderRef.file.ref = LOGFILE
So, if i have 100 classes the log4j2.properties file would be quite lengthy. Unlike if i had to do the same thing in log4j. Please note the prefix of file1, file2, etc.
Question is, is there a way i can write the logger the same way as i did in log4j? Or, is there a simpler way to achieve the same?
If above is not possible, i might as well stick to log4j. Cause it becomes a serious trouble for me to create loggers for each class in large projects.
Thanks in advance.
Take a look at the Log4J2 XML configuration file format with which it will suffice to add one single line to configure logging for a class. This provided that you are content with writing all the log to one and the same destination, otherwise more than one line per class may be required.
Example:
<?xml version="1.0" encoding="UTF-8" ?>
<Configuration>
<Appenders>
<Console name="CONSOLE" target="SYSTEM_OUT">
<PatternLayout pattern="%d %-5p %-30C - %m%n" />
</Console>
</Appenders>
<Loggers>
<Logger name="se.ivankrizsan.java.MyClass" level="DEBUG"/>
<Logger name="org.springframework" level="INFO"/>
<Root level="INFO">
<AppenderRef ref="CONSOLE" />
</Root>
</Loggers>
</Configuration>
Note also that you can specify the log-level for entire packages and thus multiple classes at once as with the org.springframework package in the above example.
Reference: Log4J2 XML configuration documentation.
I am trying to clean up the logging configuration one of our applications currently uses for it's log4net implementation. The application is called with an argument containing the filepath to an XML file. That XML file includes various configuration information, one of which is the logger name to use.
Currently, every configuration file has it's own logger, and every logger has their own appenders. As an example we would have:
logger job1
logger job2
logger job3
and
appender consoleJob1
appender consoleJob2
appender consoleJob3
appender rollingFileJob1
appender rollingFileJob2
appender rollingFileJob3
appender smtpJob1
appender smtpJob2
appender smtpJob3
Even though each of those appenders have nearly identical configurations. With hundreds of configuration files, this logging configuration section of the app.config is quite large. I believe I can consolidate most of these down to just a handful of generic appenders (Console, rollingFile, smtpToIT, smptpToSupport etc), and change each logger to use the generic appenders.
A big roadblock to how I visualize this working, is that each appender would need to use the logger's name in the configuration somewhere. Is there a variable or setting I can use in an appender that will allow the appender to use the logger's name? For instance, the RollingFileAppender should log to '\log[loggername].txt' The smtpAppender should have a subject of 'Log for [loggername] on MM\DD\YYYY'.
I took a look at http://logging.apache.org/log4net/release/config-examples.html, and believe I understand how the date can be added but I don't see anything about accessing the logger name from within the appender.
Is there anyway to access a property of the logger being used within the appender? Further, am I understanding how log4net is meant to be configured, with appenders being re-used among multiple loggers? I hadn't heard of log4net until a few weeks ago so I might be going about this all wrong.
I found the solution elsewhere, in an answer to a different question. Unfortunately I don't remember where I found it and only came back to my original question because of Newtopian's answer.
You can set a Global property through the following line:
log4net.GlobalContext.Properties["id"] = "SomeText";
Then refer to it in the appender as I did below:
<appender name="NewAuto2ProcessingTestFILE" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="Log/%property{id}NewAuto2ProcessingTest.txt" />
<appendToFile value="true" />
<maxSizeRollBackups value="10" />
<staticLogFileName value="true" />
<datePattern value=".yyyy-MM-dd.\\t\\x\\t" />
<rollingStyle value="Date" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%d [%t] %-5p - %m%n" />
</layout>
</appender>
Was looking for the same thing, unfortunately it seems it's not possible out of the box, check the doc here about the accepted variables in the pattern String.
You'd probably would have to create your own appender, or your own formatter, to gain access to more variables (I suspect both).
My Application is using logging in two manner....1) programatic 2) log4j.xml
I have to create the logs files in two ( 1 using programatic and other using log4j.xml ) locations.
Programatic way ( have one more properties file in which all the things are mention like log level and all....lets say..thorugh this...file is getting created..name as "SAS_VP.log") :
Enumeration loggers = Logger.getRootLogger().getLoggerRepository().getCurrentLoggers();
......
Logger temp = (Logger)iter.next();
temp.setLevel(level);
log4j.xml
<appender name="FILE" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="/LOGS/SAM/SAM_VJ.log"/>
<param name="Threshold" value="DEBUG"/>
<param name="MaxFileSize" value="10000KB"/>
<param name="MaxBackupIndex" value="10"/>
<param name="Append" value="false"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{dd MMM yyyy HH:mm:ss,SSS} [%t] %5p [%F(% M):%L] %m%n"/>
</layout>
</appender>
<root>
<appender-ref ref="CONSOLE"/>
<appender-ref ref="FILE"/>
</root>
ISSUE :
Log level which i set programatically overwrite the log level of log4j.xml.Like in log4j.xml is have set the level "Debug" and Programatically I have set the level as "ERROR" then the file (SAM_VJ.log) which is created by log4j.xml only contains ERROR level logs.
How to solve this issue...I want that...my both logging ( programmatic and log4j ) should be indepedent.
Is there anything in log4j in which...if i have set the log level of package "com.sas" is "Debug" then nobody can modify that...something like mutable type
<logger name="com.sam">
<priority value="DEBUG"/>
</logger>
Looking for your suggesstion....
I'm not sure you should really ask for such a functionality.
You're talking about a way to configure the log4j framework, and yes, it supports 3 different ways of configuration:
properties file
xml configuration
programmatically, via your java code
Its ok to me that the programmatic configuration allows to change the configured state of log4j loggers/appenders whatsoever.
Your xml configuration should be loaded during the system startup, and then you apply your java code that overrides the configuration.
If you have a logic of supplying a configuration in Java, why don't you improve your logic and define an error level (from your example) only if you really wish to do it.
Its impossible to configure the same logger to work both with DEBUG level (and up) AND ERROR level (and up).
This is a feature in fact, and not a drawback, since it allows to change the behavior of LOG4j on the running system (without a restart) which is useful for issue tracking.
Of course you can WRAP your loggers so that they won't allow setLevel, but, I really don't see why would you do that.
Hope, this helps
Why not just use two appenders with different log levels instead?You can add levelMax and levelMin params to tell log4j the appender just log those levels.
<param name="LevelMax" value="warn" />
<param name="LevelMin" value="info" />
I am confused as to why INFO statements are making it to the Console. Here is the general setup:
<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<param name="Target" value="System.out"/>
<param name="Threshold" value="DEBUG"/>
<layout .../>
</appender>
<appender name="REST_LOG" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="/logs/rest.log" />
<param name="Threshold" value="INFO" />
....
</appender>
<category name="xyz.web">
<priority value="WARN" />
<appender-ref ref="CONSOLE" />
</category>
<category name="xyz.web.rest">
<priority value="INFO" />
<appender-ref ref="REST_LOG" />
</category>
So I want INFO and above statements to only do to REST_LOG and WARN statements and above to go to REST_LOG and CONSOLE. What I am seeing is INFO statements from xyz.web.rest in the REST_LOG as expected but also seeing INFO statements from xyz.web.rest in CONSOLE which I wasn't expecting.
Can somebody explain what is going on?
You should set additivity to false on the xyz.web.rest logger.
Without the additivity you will see all the INFO message logged with logger xyz.web.rest twice in the console, because the logger inherit the appender of Root logger
and of the xyz.web logger.
See the Appenders and Layouts section of the Log4j documentation
Named Hierarchy
A logger is said to be an ancestor of another logger
if its name followed by a dot is a prefix of the descendant logger
name. A logger is said to be a parent of a child logger if there are
no ancestors between itself and the descendant logger.
For example, the logger named "com.foo" is a parent of the logger
named "com.foo.Bar". Similarly, "java" is a parent of "java.util" and
an ancestor of "java.util.Vector". This naming scheme should be
familiar to most developers.
The root logger resides at the top of the logger hierarchy. It is exceptional in two ways:
it always exists,
it cannot be retrieved by name.
Appenders and Layouts
Each enabled logging request for a given logger will be forwarded to
all the appenders in that logger as well as the appenders higher in
the hierarchy. For example, if a console appender is added to the
root logger, then all enabled logging requests will at least print on
the console.
If in addition a file appender is added to a logger, say C, then
enabled logging requests for C and C's children will print on a file
and on the console. It is possible to override this default behavior
so that appender accumulation is no longer additive by setting the
additivity flag to false.
The thresholds are hierarchical. DEBUG includes all INFO, WARN, ERROR. So it is natural that if you define console with a threshold of DEBUG that it would receive INFO level messages.
If you only want console to receive WARN and ERROR, set its threshold to WARN.