log4j | 易学教程

Log level in tests for PlayFramwork 1.x

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问题 When I launch my tests in localhost:9000/@tests# in console I can see long-long log with DEBUG log-level. I want to get rid of that. I tried to put to my application.conf line like: application.log=INFO or even this line: application.log.system.out=off But it does not work. Maybe I should put log4j setting specially for test context somehow..? 回答1: You can simply prefix those two rules with the "test" id. %test.application.log.system=off %test.application.log=ERROR And by the way log levels

Adding log4j.properties to war file (in Solr application)

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问题 I have a problem with logging in Solr. I want it not to write everything on standard output (I mean glassfish server.log). I want it to use log4j and to write its messages to separate file. I've created log4j.xml file but I don't know if I can add it to the .war file. I've tried external log4j.xml file and setting JVM option -Dlog4j.configuration=file:/{path_to_file} and it worked but only partially. I have some other applications installed on glassfish and all of them started to write to

A unique ID per User / Session in logs on all levels? Log4J?

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问题 Well we are doing some performance testing to figure out what steps of our application take how much time. Of course easy to parse / filter logs with regexp are a charm. To the problem: Our jsf application is split into several projects, which are used by other (non jsf) applications. My first approach would have been: if(logger.isDebugEnabled()) logger.debug("Service call took: " + (System.currentTimeMillis() - time)+ " JSESSIONID="+CookieUtil.getJsessionId(FacesContext.getCurrentInstance())

Will the Java optimizer remove parameter construction for empty method calls?

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问题 Suppose I have code like : log.info("Now the amount" + amount + " seems a bit high") and I would replace the log method with a dummy implementation like : class Logger { ... public void info() {} } Will the optimizer inline it and will the dead code removal remove the parameter construction if no side effects are detected? 回答1: I would guess that the compiler (javac) will not, but that the just in time compiler very likely will. For it to work however, it has to be able to deduct that

Log file not being updated/created using log4j in java

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问题 I am trying to capture the logs using log4j in Java. The executeable is in linux envirnment and it displays the logging message, however, it is not writing into the log file. I am using log4j.xml and this is what I have so far <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="LocalFileAppender" class="org.apache.log4j.RollingFileAppender"> <param name="File" value="logs

Output Spark application id in the logs with Log4j

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问题 I have a custom Log4j file for the Spark application. I would like to output Spark app id along with other attributes like message and date so the JSON string structure would look like this: {"name":,"time":,"date":,"level":,"thread":,"message":,"app_id":} Now, this structure looks like this: {"name":,"time":,"date":,"level":,"thread":,"message":} How can I define such layout for the Spark driver logs? My log4j file looks like this: <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j

Hibernate log using hibernate.stat

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问题 I am using log4j.xml to config my hibernate logging. I used org.hibernate.stat to view the statistics. However I am not able to view the specific SQL statement with the statistics. I do not want to use hibernate.SQL as I want to view the time taken to process the respective query. Below is a segment of my log4j.xml file: <category name="org.hibernate.stat"> <level value="debug"/> <appender-ref ref="LOG_FILE"/> </category> <category name="org.hibernate"> <priority value="debug" /> </category>

logging static methods in a parent class

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问题 I have an abstract class Parent, with 2 subclasses A and B. Parent has one static method called do(). I am wondering if there is a way for that static method to add log info in Logger for class A when it's called as A.do() and log B when it's called as B.do(). The usual protected final Logger LOGGER = Logger.getLogger(getClass()); won't work as do() is a static method so Logger needs to be static as well, but the getClass() method is obviously not static. Thanks. 回答1: I wouldn't recommend it,

Log4j:Logs are displying on console but File is not getting updated

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问题 Here i am using log4j API in standalone application in Netbeans.Logs are getting printed on console but NOT in File.Log4j file is present in the source folder .Please help me! Below is the my log4j.properties file log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.file.layout.ConversionPattern=%d %5p %c{1}\:%L - %m%n log4j.appender.file.File=E:\\Final\\Testing123.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.DatePattern`enter code here`='

SpringBoot项目实现日志链路追踪

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 1.背景简述依赖原始的log4j2配置，很难从某服务庞杂的日志中，单独找寻出某次API调用的全部日志。本文通过在日志中打印唯一的traceId来实现每次调用的追踪。 2.关键思路 2.1.MDC 日志追踪目标是每次请求级别的，也就是说同一个接口的每次请求，都应该有不同的traceId。每次接口请求，都是一个单独的线程，所以自然我们很容易考虑到通过ThreadLocal实现上述需求。考虑到log4j本身已经提供了类似的功能MDC，所以直接使用MDC进行实现。关于MDC的简述 Mapped Diagnostic Context，即：映射诊断环境。 MDC是 log4j 和 logback 提供的一种方便在多线程条件下记录日志的功能。 MDC 可以看成是一个与当前线程绑定的哈希表，可以往其中添加键值对。关于MDC的关键操作向MDC中设置值：MDC.put(key, value); 从MDC中取值：MDC.get(key); 将MDC中内容打印到日志中：%X{key} 2.2.自定义Filter 假定已经解决了traceId的存放问题，那么何时进行traceId的存放呢？其实有多重实现思路，例如：过滤器、AOP、拦截器等等。本文采用过滤器的形式，即：自定义一个Filter