Not Exactly related to the Question, But the below are my learning in log4j2 migration. hope it helps someone. Since the log4j vulnerability which was discovered in late 2021, many organizations have upgraded to log4j2 to overcome it. and many developers needed to understand what exactly is log4j and what is the vulnerability. I recommend … Read more
There are two ways to make log4j2 find your custom plugin: through the packages configuration attribute and through a javac-generated plugin dat file. Option 1: the packages attribute There was an old version of log4j2 where the packages attribute no longer worked, but this was fixed in 2.0.1. This should not be an issue any … Read more
Default Property map Looking at http://logging.apache.org/log4j/2.x/manual/configuration.html#PropertySubstitution you can specify a default property map in the configuration file. That takes this form: <Configuration status=”debug”> <Properties> <Property name=”oauthLoginLogPath”>default/location/of/oauth2.log</Property> </Properties> … <Appenders> <Appender type=”File” name=”File” fileName=”${sys:oauthLoginLogPath}”> …. </Configuration Then, if you start your app with system property -DoauthLoginLogPath=/path/oauth2.log, the File appender fileName value will first be looked up … Read more
As of 2.0-beta9 this is now configurable in xml <configuration … shutdownHook=”disable”> Considering its now disabled, I guess I need to manually shutdown the logging system at the end of my shutdown hook. However I couldn’t find a means thorough the external interface, only in the internal api import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.core.config.Configurator; import org.apache.logging.log4j.core.LoggerContext; … … Read more
I would recommend using the log4j-1.2 adapter that is included in the log4j2 distribution. That way, any libraries coded to the log4j-1.2 API will work with log4j2 without any code changes. Your classpath should include: log4j-api-2.6.1.jar log4j-core-2.6.1.jar log4j-1.2-api-2.6.1.jar log4j2.xml Your classpath should not include: log4j-1.2.x.jar log4j.properties or log4j.xml (these will be ignored by log4j2 anyway) … Read more
You’re creating a call-loop with log4j-slf4j-impl-2.3.jar and log4j-to-slf4j-2.3.jar. log4j-slf4j-impl-2.3.jar is the implementation of the adapter that sends slf4j calls to log4j. log4j-to-slf4j-2.3.jar is sending log4j calls right back to slf4j. Remove this one.
You could use the static method #initialize(String contextName, ClassLoader loader, String configLocation) (see source here) in org.apache.logging.log4j.core.config.Configurator. (You can pass null for the class loader.) Be aware that this class is not part of the public API so your code may break with any minor release. For completeness, you can also specify the location of … Read more
An alternative to using the built-in lookups is to create a custom lookup. This can be accomplished in a few lines of code with a log4j2 plugin. Your custom lookup then provides the exact value you want to show in the file header at each roll over. The plugin code would look something like this: … Read more
Since 2.5, Log4j supports a custom Delete action that is executed on every rollover. You can control which files are deleted by any combination of: Name (matching a glob or a regex) Age (“delete if 14 days old or older”) Count (“keep only the most recent 3”) Size (“keep only the most recent files up … Read more
Here is what I constructed after going through the documentation and worked. rootLogger.level = INFO property.filename = trace.log appenders = R, console appender.console.type = Console appender.console.name = STDOUT appender.console.layout.type = PatternLayout appender.console.layout.pattern = %d %5p [%t] (%F:%L) – %m%n appender.R.type = RollingFile appender.R.name = File appender.R.fileName = ${filename} appender.R.filePattern = ${filename}.%d{yyyy-MM-dd} appender.R.layout.type = PatternLayout appender.R.layout.pattern … Read more