log4j

问题 I have a trouble when using %C in ConversionPattern with AsyncAppender. My Lo4J configuration is: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="console" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy/MM/dd HH:mm:ss,SSS} %C{1} - %m%n" /> </layout> </appender> <appender name=

问题 I saw several questions on the topic, but since they are rather related to errors I don't think this is a duplicate. My problem is that I can't get any logging out of a .war I'm deploying on JBoss 6 EAP, there are no errors logged also however. There is also a file named as my .war created under the /log folder in JBoss, but it is also empty. The .war deploys fine and works. Since I'm using Spring I can't even see it initializing it's contexts. Logging works perfectly under Tomcat 7 with the

问题 I added the system environment value PROJECT_HOME=C:\Program Files\Project Now i'm trying to use the system environment value in log4j.properties but didn't set it **log4j.properties** **log4j.appender.LOGFILE.File="${env.PROJECT_HOME}"/project.log** Could you please tell me how to set system environment variables in log4j.properties? Using log4j-1.2.7 version 回答1: This is supported by EnvironmentLookup in log4j - 2. See examples. Use ${sys:PROJECT_HOME} instead of ${env.PROJECT_HOME} 来源：

问题 Here is the challenge I'm facing: I have a servlet program. And I need to write logs for each user to the folder named after that user. Something like this: // stores message to David folder // /root_path/David/logfile.log logger.error(MarkerManager.getMarker("David"), "Error happened"); // stores message to Mark folder // /root_path/Mark/logfile.log logger.error(MarkerManager.getMarker("Mark"), "Something is broken"); In my example I used markers. But I don't really know whether markers

问题 I have a package "com.example". This package has five classes. I want to log four of these classes to a file, but exclude the fifth class. I could write four loggers, e.g. logger name="com.example.Class1", and add the same appender to all four loggers. Is there no easier way (let us think that I have 100 instead of 5 classes)? There are some other questions like this one. But the other guys just wanted to exclude a class to log this class. This can be solved using the addivity flag. But I

问题 I'm wondering how to convert the following code to output those lines into a text file, and not to standard output: import org.apache.log4j.Logger; import org.apache.log4j.PropertyConfigurator; public class HelloWorld { static final Logger logger = Logger.getLogger(HelloWorld.class); public static void main(String[] args) { PropertyConfigurator.configure("log4j.properties"); logger.debug("Sample debug message"); logger.info("Sample info message"); logger.warn("Sample warn message"); logger

问题 I have multiple instances of a thread class running at any given time. I have log4j setup to be used for logging needs. I need a way to setup log4j so that every instance of my thread class outputs its log in a different log file. Here is what I have done ( in pseudo code) public class doSomething extends Thread { private Logger d_logger; public doSomething(int id){ d_logger = Logger.getLogger("doSomething"+id); String logFileName = "doSomething"+id+".log"; Properties prop = new Properties;

问题 I have following XML configration i would like to convert to java property file. I am getting below error log4j:WARN Failed to set property [filter] to value "org.apache.log4j.varia.DenyAllFilter". log4j:ERROR Could not instantiate class [true]. java.lang.ClassNotFoundException: true at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader

问题 In Log4j, what is the difference between NDC and MDC? Can I have a simple example where they are used? 回答1: To expand on the link which Sikorski put in the comments: NDC In NDC, the N stands for nested , meaning you control a single value with a Stack. You "push" a string, then you can "push" another whenever processing dictates; and when processing is complete you can pop it off to see the former value. This sort of contextual logging would be useful in some deeply-nested processing. Setting

问题 I'm building an Apache Spark Streaming application and cannot make it log to a file on the local filesystem when running it on YARN . How can achieve this? I've set log4.properties file so that it can successfully write to a log file in /tmp directory on the local file system (shown below partially): log4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.File=/tmp/application.log log4j.appender.file.append=false log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j