I would like to use graylog as central logging server and currently I am just using slf4j Logger "slf4j-api" as Java logging framework for logging in my java application. Can i use SLF4J to send logging to Graylog? or Which additional libraries do i need to send these logs to Graylog?
SLF4J is just a facade for other logging libraries.
You have to use a GELF appender for the specific logging framework (Log4j, Logback, java.util.logging, etc.) you're using in your application.
Check out the Graylog Marketplace for existing GELF appenders for Java logging frameworks:
https://marketplace.graylog.org/addons?tag=java
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I am working with embedded undertow and using org.jboss.logging.Logger for logging. I cannot use log4j or slf4j since the application which is gonna use my jar might not be using different version of log4j and there might be some conflicts. And also since undertow already has jobss.logging in-built I do not want to add any dependency to my jar.
So, is there any way I can add the logging level at run time by passing the level as a parameter to a method or constructor?
JBoss Logging is just a logging facade like slf4j. You need a log manager to configure logging. JBoss Logging works with JUL, JBoss Log Manager, log4j, log4j2 and logback. If you don't have a log manager on your class path then JUL will be used.
You can also define which log manager JBoss Logging should attempt to bind using the org.jboss.logging.provider system property. The valid values are:
jboss for the JBoss Log Manager
jdk for JUL
log4j2 for log4j2
log4j for log4j
slf4j for logback
I want to use Log4J2 API, but I want all logs to be processed by java.util.logging (which will use Tomcat implementation). For example it's possible with SLF4J and slf4j-jdk14 library. Is it possible with Log4J2? I've found log4j-jul library, but it seems to work the other way: JUL API will be redirected to Log4J implementation.
I'm aware that it's possible to replace Tomcat logging subsystem with Log4J2, but it seems a fragile solution to me.
Why do you consider using Log4j 2 to handle the logging as fragile? Have you seen http://logging.apache.org/log4j/2.x/log4j-appserver/index.html?
No, Log4j does not provide a bridge to route logging to java.util.logging. You can route the Log4j 2 API to SLF4J and then route that to java.util.logging.
We used Apache commons logging API for logging (debug,error etc methods), and we had used log4j implementation.
we used LogManager.getCurrentLoggers() from log4j to get all the loggers.
Now we deployed our application in jboss wildfly which uses different logging implementation (Jboss logging) so our code is not working since all our loggers now are from Jboss.
Now either i have to find alternate equivalent of LogManager.getCurrentLoggers() in Jboss or exclude logging subsystem in jboss-deployment-structure.xml.
is there any way to get listofloggers through common logging api? so that my code always works irrespective of the logging implementations?
I am writing standalone java application which is using Hibernate. Maven brought jboss-logging library for me. I am not using JBoss. The question is: can I log with this library only, or I need to download some logging implementation like log4j?
JBoss Logging is just a logging facade. To configure your loggers, e.g. use/add handlers, you need a log manager like JBoss Log Manager, the J.U.L. log manager, logback or log4j.
JBoss Logging will attempt to discover which log manager is being used. You can specify which log manager you'd like to use with the org.jboss.logging.provider system property. The allowed values for `org.jboss.logging.provider' are:
jboss - for JBoss Log Manager
jdk - For the J.U.L. log manager
log4j - For the log4j log manager
slf4j - For logback with slf4j
Hibernate uses JBoss Logging for it's i18n capabilities, it's vararg logging methods and the ability to not be tied to a log manager.
Of course you can absolutely use JBoss Logging in your project. If you want to configure logging handlers you'd also have to use a log manager as well.
afaik, jboss-logging is more a extra layer on top of normal logging api, to provide more sophisticated feature like i18n etc.
JBoss-logging can use other logging library (e.g. SLF4J) as the underlying handler for log.
I believe if you are writing a simple standalone Java app, you do not need to use JBoss-logging (unless you know you really want and need to do so).
Using SLF4J (with LogBack or Log4J binding) will be a good choice. Visit http://slf4j.org for more information
Make sure you have jboss-logging and your logger implementation in your classpath and set the system property org.jboss.logging.provider to log4j, jdk, slf4j or jboss depending on what you want. In theory autodetection may also work.
https://github.com/jboss-logging/jboss-logging/blob/master/src/main/java/org/jboss/logging/LoggerProviders.java#L29
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