log4j

/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:61598,suspend=y,server=n -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=61597 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath "/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java

I have my own logging engine which writes the logs on a separate thread with a blocking queue. For the sake of using "standard software" I am thinking about switching to log4j. I don't want my highly concurrent software to be slowed down by log commands that write everything to disk as some as the command is called. Can log4j be used as a dumpster instead? Log4j is the logging implementation on most JavaEE app-servers out there, so that's a good advert for its concurrency abilities. Having said that, I have seen Log4j 1.2 deadlock under high load conditions. A bit of investigation highlighted

异常信息 Exception in thread "main" java .lang .NoClassDefFoundError : org/apache/commons/logging/LogFactory at org .springframework .boot .SpringApplication .<clinit>(SpringApplication .java : 179 ) at com .example .log 4j2 .Log 4j2Application .main (Log4j2Application .java : 10 ) Caused by: java .lang .ClassNotFoundException : org .apache .commons .logging .LogFactory at java .net .URLClassLoader .findClass (URLClassLoader .java : 381 ) at java .lang .ClassLoader .loadClass (ClassLoader .java : 424 ) at sun .misc .Launcher $AppClassLoader .loadClass (Launcher .java : 331 ) at java .lang

How does The JDK's Logger compare to Apache log4j ? Which one is better for new projects that target Java 6? How do they compare in terms of flexibility and configurability? To my mind the only thing the JDK Logger has going for it is that it is part of the JDK, so it doesn't add an external dependency. If the choice is only between those two, I'd go with Log4j. It still has better support in terms of appenders, the number of people who know it (in my anecdotal observations), and a better API (that is subjective as well). Starting a project today, the most tempting thing to do is go with slf4j

Closed. This question is off-topic . It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I spark-submit jobs on an Amazon EMR cluster. I'd like all spark logging to be sent to redis/logstash. What is the proper way to configure spark under EMR to do this? Keep log4j: Add a bootstrap action to modify /home/hadoop/spark/conf/log4j.properties to add an appender? However, this file already contains a lot of stuff and is a symlink to hadoop conf file. I don't want to fiddle too much with that as it already

log4j:WARN No appenders could be found for logger (org.apache.zookeeper.ZooKeeper). log4j:WARN Please initialize the log4j system properly. Exception in thread "main" org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /servers/server at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783) at cn.itcast.bigdata.zkdist.DistributedServer.registerServer(DistributedServer.java:46) at cn.itcast.bigdata

Is there a lightweight logging framework/server I can use to setup remote logging in Java? I know log4j has SocketAppenders but a) I want a library that is more out of the box where I can simply run a log server, b) I want the logging calls to be completely asynchronous non-blocking from the rest of the code and c) A nice web based dashboard/viewer on the log-server would be also nice You could use log4j with a SyslogAppender and use some tool for viewing the syslog(-ng). Use the async appender wrapper that ships with log4j, a nice article about that can be found here . Apache Flume and Apache

日志存储系统常用技术方案介绍 日志存储系统常用技术方案有两种：一是log4j/logback+mongodb的方式，一种是基于ELK的日志存储系统。 日志一般存储在数据库和文件系统中。日志数据要和生产正式库分开存储，否则会影响正式库的运行，带来隐患。另外，为了防止日志存储性能问题，后期可以考虑采用异步的消息队列形式进行存储。 下面详细讲解。 　　1.便捷的日志存储方式log4j+mongodb 　　1）安装和配置简介 　　需要引入的jar包有：Mongo Java driver、Log4J(1.2.16以上版本)、log4mongo-java，通过log4j.properties属性文件配置，整合log4j和mongodb。log4j可直接写数据到mongodb中。 　　2）日志分析和查看 　　可通过mongovision这个web客户端进行日志的查看和分析。mongovision，使用extjs作为前端，体验较好，需要java7及以上版本。 　　2.基于ELK的日志系统 　　ELK=ElasticSearch+LogStash+Kibana 　　日志数据流如下：应用将日志落地在本地文件，部署在每台服务器上的FileBeat负责收集日志，然后将日志发送给LogStash；LogStash对日志进行处理解析等操作；然后将处理后的Json对象传递给ElasticSearch

What is meant by "Attempted to append to closed appender " ? The following is a small part of my log4j.xml file <appender name="stdout" class="org.apache.log4j.ConsoleAppender"> <param name="Threshold" value="TRACE" /> <param name="Target" value="System.out" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d %-5p: %m%n" /> </layout> </appender> <logger name="java.sql" additivity="false"> <level value="trace" /> <appender-ref ref="stdout" /> </logger> I am trying to print some sql queries out , but I am getting the above error . Am I missing something ?