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
Related
We have older java code which was using log4j 1.17 and application logs were writing to log file properly. As part of vulnerability fixing we have to migrate to log4j 2.17.2 (Mandatory as part of compliance). We have followed the migration plan as per the Apache blog- https://logging.apache.org/log4j/2.x/manual/migration.html
So, now we have added the reference of log4j-1.2-api-2.17.2.jar, log4j-api-2.17.2.jar and log4j-core-2.17.2.jar files instead of log4j-1.17.
But, with log4j-2.17, no logs are populating in the log file....though application is running and functionalities also working....but no logs in the log file.
As soon as we refer the log4j-1.17, log files are starts populating. I am not able to figure out what is going wrong here.
Below is how the logger was instantiated in old code-
static Logger log = Logger.getLogger(SendApproverDetails.class);
Log4j.Properites files details-
Updated the log4j.properites file with
#PiotrP.Karwasz suggestion. Still no luck-
I'm running a web application in a Weblogic server (Im not realy familiar with ).
Via JVM args a log4j config is passed with log level DEBUG to the application.
In the log file I can also find some log entries of DEBUG level.
So far so good.
During debugging I found some calls to logger.debug() that are not in the log file.
private static final org.slf4j.Logger logger = LoggerFactory.getLogger(ActionCtr.class);
The method call is definitely hit but nothing is written to a file.
If I do a step into during debugging I see in the logger:
org.slf4j.impl.JDK14LoggerAdapter(com.example.application.ActionCtr)
"java.util.logging.FileHandler.pattern" -> "%h/java%u.log"
And this leads to some questions for me (as I can not change the running application):
1) how could it bee that it uses the application is using a mixed up log4j and java.util.logging
2) How could I determine what is used in what classes?
3) There is no %h/java%u.log (~/java*.log) so I've tried to provide a java.util.logging conform properties file,
but this changed nothing - how an I determine where the running logger got its config from to configure it right?
1) how could it be that it uses the application is using a mixed up log4j and java.util.logging
Any of those logging frameworks could be used by the application directly or a dependent library that the application is using. It doesn't take too many dependencies to end up with a bunch of logging framework hitchhikers.
The SLF4J manual explains how that logging framework wrangles all of these other frameworks. This why you are seeing the org.slf4j.impl.JDK14LoggerAdapter.
How could I determine what is used in what classes?
Assuming you mean direct usages you can use Jdeps or Javap.
how an I determine where the running logger got its config from to configure it right?
The JConsole tool can access the JUL loggers at runtime. It will also show you all of the system properties which may include paths to logging.properties files.
If the application is pragmatically configuring the logging in an non-standard way then one option would be to use the java.security.debug using the access option. Run the application under a security manager will all or all required permissions but then enable access tracing.
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.
I have tomcat 8 configured and running nicely with log4j2.
Also catalina spooling nice JSON log with JSONlayout.
But here is a thing.
Does anyone know how to switch to JSONlayout for Tomcat's access file or even address Tomcat accessfile with log4j2 and it's pattern?
Tomcat still spooling localhost_access_log in default format.
The Tomcat access log is defined as a valve in server.xml file, there you can set whatever pattern you like, even use another implementation of the valve for access logging.
Take a look to this for more details: https://tomcat.apache.org/tomcat-8.0-doc/config/valve.html#Access_Log_Valve
Regards.
I have a web service built on Apache Wink (1.1.3), running under Tomcat, started from Eclipse for debugging. How do I turn full logging on for some Wink classes?
For a start, I just tried turning it on for all of Wink with these lines in the logging.properties file of the Tomcat conf directory:
org.apache.wink.level = FINEST
org.apache.wink.handlers = java.util.logging.ConsoleHandler
I also tried putting these lines in another file and referencing that file with -Djava.util.logging.config.file=.... Neither of these worked.
Apache Wink uses slf4j for logging. Meaning you should configure it with your favorite logger.
For example adding slf4j-jdk14.jar to your classpath will send the logs to the JDK's native logger.
I suggest you read the slf4j two pages manual.