log4j2

问题 I am using below conversion pattern log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS Z} [%t] %-5p %c- %m%n but I want to remove new line characters. I have tried using %replace(%ex){'[\r\n]+', '\\n'}%nopex%n but it's not working %replace is not working. it only reading %r and then eplace 回答1: It seems you were not using the right syntax of the %replace - see Log4j Layouts for the right one. Using the right syntax, you could remove all the newlines using the following

问题 By default log4j2 prints stacktrace on multiple lines, separated by newline characters. Something like: java.lang.NullPointerException: error enovountered at ... at ... at ... I want my stacktrace on a single line, something like, essentially using | as a delimiter rather than \n java.lang.NullPointerException: error enovountered at ... | at ... | at ... How will I accomplish something like this in log4j2? 回答1: As the PatternLayout documentation specifies, the %throwable family of conversion

问题 By default log4j2 prints stacktrace on multiple lines, separated by newline characters. Something like: java.lang.NullPointerException: error enovountered at ... at ... at ... I want my stacktrace on a single line, something like, essentially using | as a delimiter rather than \n java.lang.NullPointerException: error enovountered at ... | at ... | at ... How will I accomplish something like this in log4j2? 回答1: As the PatternLayout documentation specifies, the %throwable family of conversion

问题 I have an application that used log4j1.2.17.Now I want to change it to log4j2. So i changed the pom.xml (I'm sure that i have remove the log4j1 in any dependency), add the log4j2.xml. The log4j2 works fine, and it log the infomation that i want.But i got the below error at the begining. ERROR StatusLogger Caught java.lang.AbstractMethodError setting feature http://xml.org/sax/features/external-general-entities to false on DocumentBuilderFactory org.apache.xerces.jaxp

问题 I have an application that used log4j1.2.17.Now I want to change it to log4j2. So i changed the pom.xml (I'm sure that i have remove the log4j1 in any dependency), add the log4j2.xml. The log4j2 works fine, and it log the infomation that i want.But i got the below error at the begining. ERROR StatusLogger Caught java.lang.AbstractMethodError setting feature http://xml.org/sax/features/external-general-entities to false on DocumentBuilderFactory org.apache.xerces.jaxp

问题 I'm using log4j2 (2.11.1) with Java 11 and attempting to get a Logger object using: private static final Logger LOG = LogManager.getLogger(); (Imported from log4j-api in org.apache.logging.log4j ) At runtime, I receive the following error: WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance. Exception in thread "main" java.lang.ExceptionInInitializerError Caused by: java.lang.UnsupportedOperationException: No class provided, and an appropriate one

问题 I'm using log4j2 (2.11.1) with Java 11 and attempting to get a Logger object using: private static final Logger LOG = LogManager.getLogger(); (Imported from log4j-api in org.apache.logging.log4j ) At runtime, I receive the following error: WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance. Exception in thread "main" java.lang.ExceptionInInitializerError Caused by: java.lang.UnsupportedOperationException: No class provided, and an appropriate one

问题 We are currently upgrading log4j1 to log4j2, In our project we have log4j1 code that overriding the log file programatically by calling below 2 methods together setAppend(false); activateOptions(); What is equivalent option in log4j2?. Below is my sample code? class TestAppender extends RollingFileAppender { public void m1(){ setAppend(false); activateOptions(); } } class Test{ public void callm1(){ TestAppender ta = new TestAppender(); ta.m1(); } log4j.properties # Define the root logger

问题 We are currently upgrading log4j1 to log4j2, In our project we have log4j1 code that overriding the log file programatically by calling below 2 methods together setAppend(false); activateOptions(); What is equivalent option in log4j2?. Below is my sample code? class TestAppender extends RollingFileAppender { public void m1(){ setAppend(false); activateOptions(); } } class Test{ public void callm1(){ TestAppender ta = new TestAppender(); ta.m1(); } log4j.properties # Define the root logger

问题 We are currently upgrading log4j1 to log4j2, In our project we have log4j1 code that overriding the log file programatically by calling below 2 methods together setAppend(false); activateOptions(); What is equivalent option in log4j2?. Below is my sample code? class TestAppender extends RollingFileAppender { public void m1(){ setAppend(false); activateOptions(); } } class Test{ public void callm1(){ TestAppender ta = new TestAppender(); ta.m1(); } log4j.properties # Define the root logger