I am new to Log4j2. I am trying to configure a logging system using slf4j and log4j2.
I have few doubts.
While configuring log4j2, I noticed configuration logs form log4j2 is printed in console. I want to print those logs in file instead of console.
Is there any way to use log4j2's appender .
PS : I noted that log4j2 uses StatusLogger to print its configuration logs. Is there any way to make it use a file.
The simplest way to do this is to redirect the process output to a file:
java -cp lib/*.jar com.mypackage.MyClass > output.txt
There are some properties you may be able to use to tell Log4j to write status logs to a file (probably org.apache.logging.logj.simplelog.logFile), but at best this will work after Log4j 2 is fully initialized. I assume you are interested in the internal status log statements that are emitted during Log4j 2 startup and initialization. For that, I'd recommend redirecting to a file.
Related
I'm using log4j2 in a Web Application (servlet 3.0 API)
Log4j2 is configuring itself automatically when the application is started using a log4j2.xml file inside the WEB-INF directory.
When the context is started I execute some logic that produce some logs, and all the log produced are working accordingly to the rules defined in the log4j2.xml file.
At the end of my initialization logic I call a service that gives to me one or more log4j2 xml configuration files (for example, config1.xml, config2.xml and config3.xml).
Now I want to 'reconfigure' log4j using my initial log4j2.xml file together with all the new configuration files.
I cannot find a way to do this; I can find only a way to add programmatically new Appenders, new Loggers and so on;
I'd like to tell log4j2 "hey, here are some new configuration files; please, parse them and update your configuration accordingly"
There is a way to do this?
thanks
Thanks to Vionixt comment to my question, I solved the problem.
The code I used was:
System.setProperty("log4j.configurationFile", "<configFile1>,<configFile2>,<configFile3>");
LoggerContext.getContext(false).reconfigure();
where LoggerContext is
org.apache.logging.log4j.core.LoggingContext
After reconfiguration, all the new Logging rules were available and also used!
thank you so much,
cheers
My application is using Spring to handle the interaction with database (Sql Server)
And commons-logging-1.1.1.jar, log4j-1.2.17.jar, slf4j-api-1.6.3.jar and slf4j-log4j12-1.7.6.jar are put into build path for the logging framework of the application.
The last two logging jar (slf4j-api and slf4j-log4j12) are for another component inside the application to use log4j.
Here is my questions:
When Spring-Jdbc runtime excecption happens, the exception is only showed in the console of eclipse with the font color red. The exception is NOT logged into the log file. But the normal log (like log.info(...)) are all in the log file. Why can't the run-time exception be in the log file and how to solve this problem.
When I use SimpleJdbcCall to call the stored procedure with parameters in MapSqlParameterSource, the following log shows up:
14:43:30 [INFO ] Added default SqlReturnUpdateCount parameter named #update-count-1
14:43:30 [INFO ] Added default SqlReturnUpdateCount parameter named #update-count-1
......
It's really annoying because the number of this message is so large. I want to turn off this particular log message without affecting another logging with the same level (INFO)
And my log4j.xml is fine I think because the logging are basically fine except the above issues.
Spring is using commons-logging internally that's why you can see the messages in your eclipse console. To redirect commons-logging to slf4j/log4j you need to remove commons-logging-1.1.1.jar from your classpath and add jcl-over-slf4j.jar from your slf4j version. To get rid of the dublicate red eclipse messages (jul and jcl) you can set the logging level in logging.properties for the console handler to warning:
java.util.logging.ConsoleHandler.level = WARNING
Second issue was solved here.
I am using Logback in my application hosted on Websphere App Server. Logback is configured to log to System Out (and others are hesitant to change to a different file). The issue is that Websphere uses its own format for logging to System Out. Executing logger.debug("test") in my app yields:
[8/7/12 12:27:55:629 CDT] 0000003a SystemOut O DEBUG com.myapp... test
where everything up to the "O" is added by Websphere. The rest is from Logback
I have set up Logback to use the following pattern: %-5level %logger{36} - %msg%n so that I don't repeat timestamp and thread info which Websphere does on its own, but I am still annoyed that I can't fully customize the logging to System Out from within Logback.
I don't know a whole lot about logging best practices. Before, I have logged to separate files by web app, but for this project, I was told the System Out files are monitored by a third party and I should not change from using System Out. Is there any way to get around my issue given these requirements and tell Websphere not to mess with my System Out logging, or is the only solution to start logging to a different file? Thanks!
Your logback is configured to write messages to System.out. However, everything that is written to System.out is redirected by WebSphere and written to the SystemOut.log file with the same format as log messages produced by WebSphere, but with a severity indicator "O". It is not possible to change that.
Note that it is likely that the people who told you to use SystemOut.log actually meant that you should ensure that logging is done using WebSphere's log system so that messages are written with the correct category and severity and that log levels can be changed at runtime. Since WebSphere's log system is build on java.util.logging you should probably just replace logback by slf4j-jdk14 to satisfy their requirement.
I don't think you're going to be able to change the format. And if you could, it might break the current monitoring anyway.
I wonder if anyone would mind if you log to two loggers at the same time, SystemOut for the existing monitoring, and your own for a more readable format.
The problem is that Logback redirects the messages to console output instead of java.util.logging. Console output has no log levels and that's why WebSphere just writes "O".
We solved this by implementing a Logback appender that redirects logs to JUL (java.util.logging) instead. We convert Logback log levels to JUL levels (e.g. Logback "ERROR" is JUL "SEVERE").
We also wanted to use Websphere's trace options. If trace is enabled for a class/package pattern, you will see Logback DEBUG and TRACE messages in Websphere's trace.log. You can also check if the trace is enabled by calling Logback's isDebugEnabled() / isTraceEnabled().
See this answer with a full implementation:
https://stackoverflow.com/a/74386323/395879
I am logging issues at my application like that:
private static Logger logger = LoggerFactory.getLogger(Student.class);
...
logger.info(msg);
logger.debug(another_msg);
I use Java and Spring framework running on Apache Tomcat 6 and slf4j for logging. When I debug my application on Intellij IDEA I see two tabs: Server and Tomcat Log. That logs are seen at Server tab. Under tomcat folder there is no file that records that logs. However I want to see it at file end if I can I want to change the log level(debug, info etc.) to see the logs.
How can I do it?
Search for the log4j.properties file in your application.
In the log4j.properties you specify the path for the log file.
See here
sl4j is not complete logging implementation, it is a facade to which we can couple other frameworks like log4j, java.util.logging, commons etc. so identify your logging framework and check the corresponding doc for the configuration file.FOr log4j it will be log4j.properties
I am using Tomcat version 5.5.x. My WAR sets its own logging properties successfully and logs to $TOMCAT_HOME/logs/.YYYY-MM-DD.log. Everything that is written to my log is also written to catalina.out. Is there a way to stop the redundant logging to catalina.out stop?
Change your application's logging configuration so it doesn't log anything to the console/standard out. Tomcat redirects standard out to the catalina.out file, so if you see output in catalina.out it implies your application is writing to the console.