I am not using any XML configuration file, rather I am setting the logger configuration programmatically. The logger works correctly but just when I call the first line of the code below, a warning ERROR message shows up to tell me that the configuration file was not found and default configuration will be used.
But I don't want this message to be displayed on the console every time I rung the program because I will programmatically add the configuration myself.
The message:
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
It comes when I call the code below:
LoggerContext context = (LoggerContext) LogManager.getContext(false);
Or if I get the root logger first:
Logger logger = LogManager.getLogger(LogManager.ROOT_LOGGER_NAME);
Is there some kind of property that I can set to disable this message from being displayed? Or another approach?.
NOTE: I disabled another notification regarding Log4j2 JMX by setting the property -Dlog4j2.disable.jmx=true. But I couldn't find for this one.
Add the following system property in order to not show that message:
-Dorg.apache.logging.log4j.simplelog.StatusLogger.level=OFF
Alternatively, and more simply:
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.status.StatusLogger;
...
StatusLogger.getLogger().setLevel(Level.OFF);
You can simply do this in your main class.
static {
StatusLogger.getLogger().setLevel(Level.OFF);
}
You have to implement initialize method for proper initialization of log4j configurations from code.
Check the "How do I configure log4j2 in code without a configuration file" section in below page which provides the source code also.
http://logging.apache.org/log4j/2.x/faq.html
Related
the log file is generated when I run the code within IDE (Intellij IDEA).
as soon as I create runnable jar of the code and then try to run the jar then the logs are not generating.
I have made sure the log4j2.xml file is a part of classpath.
is there anything extra I have to do while creating jar in the Intellij IDEA?
Taken from the FAQ: How do I debug my configuration?
First, make sure you have the right jar files on your classpath. You need at least log4j-api and log4j-core.
Next, check the name of your configuration file. By default, log4j2 will look for a configuration file named log4j2.xml on the classpath. Note the “2” in the file name! (See the configuration manual page for more details.)
From log4j-2.9 onward
From log4j-2.9 onward, log4j2 will print all internal logging to the console if system property log4j2.debug is either defined empty or its value equals to true (ignoring case).
Prior to log4j-2.9
Prior to log4j-2.9, there are two places where internal logging can be controlled:
If the configuration file is found correctly, log4j2 internal status logging can be controlled by setting in the configuration file. This will display detailed log4j2-internal log statements on the console about what happens during the configuration process. This may be useful to trouble-shoot configuration issues. By default the status logger level is WARN, so you only see notifications when there is a problem.
If the configuration file is not found correctly, you can still enable log4j2 internal status logging by setting system property -Dorg.apache.logging.log4j.simplelog.StatusLogger.level=TRACE.
I am new to SLF4j and I don't know if the logback.xml file has loaded properly or not. The logback.xml file is in PROJECTNAME/src/main/java where all my packages are found.
My questions are:
How can I know if the configuration file has properly loaded or not
?
How can restrict the logging only from an explicit set of class,
only to avoid logging from libraries
You can add the debug="true" attribute to the <configuration> element to enable debug of the logback configuration. It will print the configuration to the console. See https://logback.qos.ch/manual/configuration.html#dumpingStatusData.
Simple answer, if the configuration file is loaded properly, you will see results in log file or console, depending on your configuration.
By default, logback searches file in src/main/resources instead of src/main/java if I remember correctly.
In the configuration file, you can define log lever on a specific logger. Normally you'll still want to see logs of the libraries, but maybe only WARN or ERROR, so you could set the root level to WARN/ERROR, and add a logger of your root package with DEBUG/INFO level.
Also, use a logback-test file (under src/test/resources) for your own dev environment.
I need to add debug points in my javaagent. I am having my premain method in one class and AgentClassFileTransformer in another class. Since my organization use following approach which use org.apache.commons.logging package I also tried to use that method.
private static final Log log = LogFactory.getLog(InstrumentingAgent.class);
But, if I add only the log4j.properties file to the resource folder of the project, it prints the logs from the class with premain method.
But for the class which implements ClassFileTransformer it says no appenders can be found. But, again if I add the commons-logging.properties file to the same resources folder, then it'll print all the logs required in the console. (Even if I use the logger of type log4j as follows, it still says no appenders can be found for Transformer class)
Commons-logging.properties
org.apache.commons.logging.Log = org.apache.commons.logging.impl.Log4JLogger
Warning for Transformer class
log4j:WARN No appenders could be found for logger (InstrumentationClassTransformer).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
In my case I'll be adding on debug level logs in my agent. But when the agent run with a product it shouldn't print debug logs on the console. In terms of log4j I have read about setting the log level of the logger using setLevel(Log.level) method. But since I am using commons-logging's LogFactory it doesn't give any option to set the level also. So I would like to have some suggestions on how to get over this situation.
How can I get this to work? Is it something that can be achieved or do I need to change the logging mechanism?
Update 1
I have even added the package name, as mentioned by madhawa, but still it doesn't print logs of ClassFileTransformer.
log4j.rootLogger=DEBUG, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.conversionPattern=%5p [%t] (%F:%L) - %m%n
log4j.logger.org.javaagent.instrumentation=DEBUG
It seems you haven't configure log4j.properties file correctly. Please add relevant packages and try again.
I am using c3p0-0.9.2.1 jar and i have this jar in my class path and lib folder.
Whenever i connect for the first Time i get this Error:
com.mchange.v2.cfg.DelayedLogItem [ level -> FINE, text -> "The configuration file for resource identifier '/mchange-commons.properties' could not be found. Skipping.", exception -> java.io.FileNotFoundException: Resource not found at path '/mchange-commons.properties'.]
com.mchange.v2.cfg.DelayedLogItem [ level -> FINE, text -> "The configuration file for resource identifier 'hocon:/reference,/application,/' could not be found. Skipping.", exception -> java.io.FileNotFoundException: HOCON lib (typesafe-config) is not available. Also, no resource available at '/reference,/application,/' for HOCON identifier 'hocon:/reference,/application,/'.]
My application is running fine though.i am not able to gauge what is this error and should i be worried about this error?If yes, how to remove this error.What am i doing wrong.
These are DEBUG level messages, basically documenting c3p0's checking all the various places configuration information can be placed, and usually not finding anything in most of those places. The FileNotFoundExceptions are how c3p0 sees there is nothing there.
c3p0 and libraries under com.mchange in general are intended to log at INFO level for normal use. If you log at DEBUG or FINE, you may see more stuff than you'd like, including things like these perfectly harmless an expected FileNotFoundExceptions during the search for config files.
I looked at the DelayedLogItem class in the cp30 package and also debugged the code.
It seems this class doesn't use logback or any logger for that matter. Actually it does something similar as most loggers, it defines its own log levels etc. The log message is actually the result of the toString() method.
During debugging I found that the BasicMultiPropertiesConfig class is trying to find some configuration files and when it doesn't it calls a method dumpToSysErr which outputs the log lines to standard error.
So it looks like there is no way to use any logger to 'catch' these log message and show it based on your logger configuration.
By the way, if you configure e.g. logback to do TRACE logging on com.mchange, then it also logs using logback (including stacktraces).
As far as i understand log4j can handle system property -Dlog4j.debug. If you run your app with it you will get log4j's debug output.
Example: java -Dlog4j.debug -jar test.jar
Is there something similar for log4j 2?
Update January 2018:
From Log4j 2.10, this is easy: just run your program with system property log4j2.debug (no value needed; an empty string is fine).
The current (log4j-2.1) documentation on the status logger is a bit confusing.
Basically:
Until a configuration is found, status logger level can be controlled with system property org.apache.logging.log4j.simplelog.StatusLogger.level.
After a configuration is found, status logger level can be controlled in the configuration file with the "status" attribute, for example: <Configuration status="trace">.
UPDATE: the documentation was improved in log4j-2.2.
It can be confusing, the nearest equivilent of the Log4J 1.x command line argument -Dlog4j.debug is -Dorg.apache.logging.log4j.simplelog.StatusLogger.level=trace which sets the Log4J 2.x "status logger" level to trace and provides detailed output about the logging configuration.
Log4J 1.x allows you to manually specify the location of the configuration file on the command line using -Dlog4j.configuration=file:///var/lib/tomcat7/log4j.xml where the configuration file is located at /var/lib/tomcat7/log4j.xml. In Log4J 2.x there is a subtle difference in the argument -Dlog4j.configurationFile=file:///var/lib/tomcat7/log4j.xml, 'configurationFile' rather than 'configuration'.
Obviously you need to ensure that your configuration file is suitible for the version of Log4J being used, the XML structure differs between 1.x and 2.x.
I've had a frustrating amount of difficulty getting Log4J2 up and running, and printing the StatusLogger is no exception. In theory you can set it in the config file with the status field, however I've not been able to make that work thusfar.
You can run the following at the beginning of your main method however:
StatusConsoleListener listener = new StatusConsoleListener(Level.ALL);
StatusLogger.getLogger().registerListener(listener);
LogManager.getLogger(LogManager.ROOT_LOGGER_NAME); // initialize logger
Note your main() class cannot have any static Loggers, or they'll be initialized before this is called, meaning the loading status messages won't print.
In case someone needs to set DEBUG level programmatically
// for your custom logger
Configurator.setLevel("com.name.of.logger", Level.DEBUG);
// for root logger
Configurator.setRootLevel(Level.DEBUG);
OR without imports
org.apache.logging.log4j.core.config.Configurator.setLevel(
"com.name.of.logger",
org.apache.logging.log4j.Level.DEBUG
);