slf4j | 易学教程

Redirect System.out and System.err to slf4j

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问题 I needed to redirect System.out/err.println outputs to slf4j. I know that this is not the way to do logging properly but there is an external library, which logs to System.out 回答1: You can use sysout-over-slf4j. The sysout-over-slf4j module allows a user to redirect all calls to System.out and System.err to an SLF4J defined logger with the name of the fully qualified class in which the System.out.println (or similar) call was made, at configurable levels. If you are not using Maven, download

JUL to SLF4J Bridge

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问题 I'm currently observing that a 3rd party library (namely restfb) is using java.util.logging and I'm seeing those logs end up in STDOUT even though I don't have an SLF4J console appender configured in my logback.xml. I also have the jul-to-slf4j bridge in my classpath. Does the jul-to-slf4j bridge only log to the appenders configured by logback when the bridge is installed or does it also log to stdout? 回答1: You need to call SLF4JBridgeHandler.install(). You also need to enable all log levels

SLF4j 和 common-logging

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 看现在有很多开源的软件，log记录都是用SLF4j，以前自己是用common-logging觉得十分方便，可以动态的切换实际的log系统，这样common-logging和SLF4J有什么区别。网上找了一篇文档，觉得说明了一些问题： Apache Common-Logging是广泛使用的Java日志门面库。我以前一直都使用它和log4j编写日志。 Apache Common-Logging通过动态查找的机制，在程序运行时自动找出真正使用的日志库。 Apache Common-Logging一直都运作得很好。直到最近，我写OSGI插件时，它不能工作了。原因是 Apache Common-Logging使用了ClassLoader寻找和载入底层的日志库。而OSGI中，不同的插件使用自己的ClassLoader。一个线程的ClassLoader在执行不同的插件时，其执行能力是不同的。 OSGI的这种机制保证了插件互相独立，然而确使Apache Common-Logging无法工作！解决之道是使用新的日志门面库Slf4j。 Slf4j库类似于Apache Common-Logging。但是，他在编译时静态绑定真正的Log库。使用Slf4j时，如果你需要使用某一种日志实现

2、slf4j、log4j 和 common-logging的关系

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 前面有一篇日志中简单的介绍了 log4j，同时也介绍了它与commons-logging的关系，但是突然冒出来一个slf4j，并且slf4j有取代commons-logging的趋势，所以，我们可以推知slf4j与commons-logging的作用应该相差不大的。好，下面开始先讲讲slf4j。 1.slf4j 他只提供一个核心slf4j api(就是slf4j-api.jar包)，这个包只有日志的接口，并没有实现，所以如果要使用就得再给它提供一个实现了些接口的日志包，比如：log4j,common logging,jdk log日志实现包等，但是这些日志实现又不能通过接口直接调用，实现上他们根本就和slf4j-api不一致，因此slf4j又增加了一层来转换各日志实现包的使用，当然slf4j-simple除外。 slf4j+log4j组合使用模式： 1. slf4j-api-1.5.11.jar 2. slf4j-log4j12-1.5.11.jar 3. log4j-1.2.15.jar 4. log4j.properties(也可以是 log4j.xml) JCL+Log4J组合使用模式（即commons-logging+log4j）： 1. commons-logging-1.1.jar 2.

Why Kotlin's loop (for) not work correct with org.slf4j.Logger?

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问题 In my Kotlin project in folder src/resources/ I has file pairs_ids.txt. Here code: This is a property file: key=value The count of all lines are 1389 . Here code that read content of this file line by line. import org.slf4j.LoggerFactory private val logger = LoggerFactory.getLogger("Exchange") private var allSymbolsIDsMap: Map<String, String> = mapOf() val pairsIDs = getResourceAsText("/pairs_ids.txt") allSymbolsIDsMap = pairsIDs.split(",").associate { val (left, right) = it.split("=") left

slf4j-log4j converts objects to string before passing to Asynchronus logger

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问题 I'm looking to log the request and response to a web service. I'm using slf4j with underlying log4j2 implementation. My logger statement looks like the below. LOGGER.info("{}",new CustomObject(request,response,param1,param2)); I have implemented the toString methods in all the necessary objects and in the CustomObject class to log all attributes of that object. I see that the toString method of the CustomObject is called before it passes the log message to the Asynch logger. Is there anyway

How to change slf4j level at runtime?

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问题 I've using SLF4j as my logging framework, backed by log4j. My problem is that I am looking for a way to change the logging level for my logger at runtime. I understand that slf4j does not permit this directly through its own API, and hence, I have to access the logging provider directly. Personally, I find this to be a huge deficiency in slf4j. So now my question is how can I determine programatically through slf4j which provider I am using? The biggest purpose of using slf4j is that you

Log4j debug to file - Info to console

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问题 I'm using log4j for logs. I have a class that i want to print to the console only log.info level, And print to some file log.info + log.debug levels (The same class). I tried to setup the log4j.xml as follows :  <appender name="parserFile" class="org.apache.log4j.FileAppender"> <param name="File" value="/var/log/java/parser/parser.log" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{E MMM dd HH:mm:ss} %c : %m%n" /> <

MDC Logger with CompletableFuture

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问题 I am using MDC Logger, which is perfectly working for me except in one case. Wherever in the code we have used CompletableFuture, for the created thread the MDC data is not getting passed to next thread and due to which Logs are failing. For example in the code I have used below snippet for creating new Thread. CompletableFuture.runAsync(() -> getAcountDetails(user)); And the result of logs as below 2019-04-29 11:44:13,690 INFO | /app/rest/controller/userdetails | f80fdc1f-8123-3932-a405

LoginAuthenticator not found by logback

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问题 I want to use logback-android-1.1.1-2.jar and slf4j-api-1.7.6.jar in my android project. But I get following error in Android Studio: Unable to resolve superclass of Lch/qos/logback/core/net/LoginAuthenticator; (2251) Link of class 'Lch/qos/logback/core/net/LoginAuthenticator;' failed I have opened logback-android.jar and I see that LoginAuthenticator file exists. Do you have any idea how to resolve this problem ? It could be caused by Android Studio? Gradle file: apply plugin: 'android'