log4j

问题 In our application, we decided to name the log4j configuration file as a custom name to avoid inadvertent loading of the default file from another jar. To configure this, we use org.springframework.util.Log4jConfigurer to specify the log4j location. <bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetClass"> <value>org.springframework.util.Log4jConfigurer</value> </property> <property name="targetMethod"> <value>initLogging</value> <

问题 log4j.properties: # configure the root logger log4j.rootLogger=INFO, SYSLOG # configure Syslog facility LOCAL6 appender log4j.appender.SYSLOG=org.apache.log4j.net.SyslogAppender log4j.appender.SYSLOG.threshold=INFO log4j.appender.SYSLOG.syslogHost=localhost log4j.appender.SYSLOG.facility=LOCAL6 log4j.appender.SYSLOG.layout=org.apache.log4j.PatternLayout log4j.appender.SYSLOG.layout.conversionPattern="MyApp: %d\{ISO8601\}%m\n" logger class import org.apache.log4j.Logger; public class

问题 I have 4 java/Java EE applications- Two are server based j2ee applications running in WebSphere. Other two are standalone java applications. My logging framework is log4j using log4j.properties. Question 1: Can I have a same log file for logging from all the applications. Will it cause any file writing issues even if all the applications are writing at the same time? Question 2: If all the applications can write without any issues, how can I pre-append the application name to each of the log

问题 I use Java and Log4j.. I want to log a string with german special characters, like for example Ü Ä ä etc.. But in my LogFile it appears like this: <E4><FC><F6> log4j.properties log4j.rootLogger = ALL, rollingFile log4j.appender.rollingFile=org.apache.log4j.RollingFileAppender log4j.appender.rollingFile.File=/home/tomcat/logs/debug.log log4j.appender.rollingFile.MaxFileSize=10MB log4j.appender.rollingFile.MaxBackupIndex=2 log4j.appender.rollingFile.layout = org.apache.log4j.PatternLayout log4j

问题 Need to disable log4j output to console during jUnit tests running but all other log4j output should be enable. There are lot exceptions during testing while checking method reaction on incorrect argument, so exception is ok. 回答1: Create a new log4j properties file called e.g. log4j-test.properties with logging disabled. In your surefire config in the POM, add argLine with -Dlog4j.configuration=log4j-test.properties . 回答2: I know this question is quite old, but still relevant in my opinion,

问题 Need to disable log4j output to console during jUnit tests running but all other log4j output should be enable. There are lot exceptions during testing while checking method reaction on incorrect argument, so exception is ok. 回答1: Create a new log4j properties file called e.g. log4j-test.properties with logging disabled. In your surefire config in the POM, add argLine with -Dlog4j.configuration=log4j-test.properties . 回答2: I know this question is quite old, but still relevant in my opinion,

问题 It seems that although the log level was set to INFO, SLF4J is still evaluating the expression. package com.ab.test.slf4j; import org.apache.log4j.PropertyConfigurator; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class SimpleTest { static final Logger logger = LoggerFactory.getLogger(SimpleTest.class); public static void main(String[] args) { PropertyConfigurator.configure("log4j.properties"); logger.debug("Test " + testEnter()); logger.debug("Test {}", testEnter()); }

问题 It seems that although the log level was set to INFO, SLF4J is still evaluating the expression. package com.ab.test.slf4j; import org.apache.log4j.PropertyConfigurator; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class SimpleTest { static final Logger logger = LoggerFactory.getLogger(SimpleTest.class); public static void main(String[] args) { PropertyConfigurator.configure("log4j.properties"); logger.debug("Test " + testEnter()); logger.debug("Test {}", testEnter()); }

问题 I'm working on the development of an application that is deployed on WebLogic 10.3. It is packaged as an EAR and includes one module. The application works fine by itself but I am faced with issue related to logging. I am using Log4j. The library is included in the EAR file and log4j.xml is placed under JAR module. So the config location is the following: A.ear/B.jar/log4j.xml Log4j config is following: <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

问题 I have the following layout patter in my log4j xml file: "%d{ISO8601} %c %p [%t] [%x] 9.5.4.RC12 %m%n" What I want is that when ever I get a log containing message process [proc#] completed , it should be skipped. I mean every log except the one containing this message should be printed. [proc#] will contain the process number of max lenght 4. What can I desing a filter with this function in my xml config file. If so, then how? 回答1: ExpressionFilter can do that. In a filter definition inside