log4j/log4j2/logback混用問題

如果不了解標(biāo)題提到的幾個日志框架帅涂，建議了解一下log4j/log4j2/logback簡單使用說明退敦，本節(jié)中pom依賴前面的內(nèi)容助析；

代碼地址

log4jdemo
log4j2demo
logbackdemo
logdemo

背景說明

java項目一般會選擇一種日志框架缠导，但很難保證當(dāng)前項目依賴的三方組件會選用和當(dāng)前項目相同的日志框架朴恳，比如當(dāng)前項目使用了logback窜骄，項目依賴了ES蛾魄，ES使用了log4j2日志框架，這時日志打印可能會有問題逛拱，甚至不打印日志敌厘，影響問題排查......

情景一

image.png

此時：
1.不在此項目（project）中指定日志屬性配置文件，原項目(project A,project B,project C)中各自使用原生日志框架類打印日志朽合，則用各自的日志配置文件打印日志俱两。
2.在此項目中指定日志屬性配置文件，原項目中的類則忽略原項目中的日志屬性配置文件曹步，用此項目中的日志屬性配置文件宪彩。

情景二

image.png

原項目(project A,project B,project C)都使用slf4j（見“升級log4j至slf4j”和“升級log4j2至slf4j”），此項目（project）中重新定義日志屬性配置文件讲婚，原項目中的類則使用log4j打印日志尿孔，啟動時，控制臺有告警，可以獲知詳細信息活合，如：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/mac2099/mvnRepository/org/slf4j/slf4j-log4j12/1.7.29/slf4j-log4j12-1.7.29.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/mac2099/mvnRepository/org/apache/logging/log4j/log4j-slf4j-impl/2.9.0/log4j-slf4j-impl-2.9.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/mac2099/mvnRepository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
new log4j 2021-10-11 23:32:04 [INFO] com.mac2099.log4j.Main: log4j demo
new log4j 2021-10-11 23:32:04 [INFO] com.mac2099.log4j2.Main: log4j2 demo
new log4j 2021-10-11 23:32:04 [INFO] com.mac2099.logback.Main: logback demo

得知最終使用了log4j日志框架雏婶；
pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>logdemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>logdemo</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>log4jdemo</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>log4j2demo</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>logbackdemo</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

排除掉子模塊中slf4j依賴的pom

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>logdemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>logdemo</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>log4jdemo</artifactId>
            <version>1.0-SNAPSHOT</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>log4j2demo</artifactId>
            <version>1.0-SNAPSHOT</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.logging.log4j</groupId>
                    <artifactId>log4j-slf4j-impl</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>logbackdemo</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

運行結(jié)果，全部使用了logback配置：

23:57:25,020 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
23:57:25,021 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
23:57:25,021 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/Users/mac2099/myinfo/code/logdemo/target/classes/logback.xml]
23:57:25,021 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs multiple times on the classpath.
23:57:25,021 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs at [jar:file:/Users/mac2099/mvnRepository/org/example/logbackdemo/1.0-SNAPSHOT/logbackdemo-1.0-SNAPSHOT.jar!/logback.xml]
23:57:25,022 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs at [file:/Users/mac2099/myinfo/code/logdemo/target/classes/logback.xml]
23:57:25,081 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
23:57:25,082 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
23:57:25,088 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [console]
23:57:25,092 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
23:57:25,130 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
23:57:25,130 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [console] to Logger[ROOT]
23:57:25,131 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
23:57:25,132 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@42f30e0a - Registering current configuration as safe fallback point

new logback2021-10-11 23:57:25 [INFO] com.mac2099.log4j.Main: log4j demo
new logback2021-10-11 23:57:25 [INFO] com.mac2099.log4j2.Main: log4j2 demo
new logback2021-10-11 23:57:25 [INFO] com.mac2099.logback.Main: logback demo

情景三

image.png

或者

image.png

如果project A使用了log4j白指，沒有使用slf4j留晚，則需要排除log4j并增加log4j-over-slf4j依賴，用來橋接日志打印

<dependency>
    <groupId>org.example</groupId>
    <artifactId>log4jdemo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <exclusions>
        <exclusion>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>log4j-over-slf4j</artifactId>
    <version>1.7.29</version>
</dependency>

如果project B使用了log4j2告嘲，沒有使用slf4j错维，則需要排除log4j2并增加log4j-to-slf4j依賴，用來橋接日志打印

<dependency>
    <groupId>org.example</groupId>
    <artifactId>log4j2demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <exclusions>
        <exclusion>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-to-slf4j</artifactId>
    <version>2.12.1</version>
</dependency>

運行結(jié)果橄唬，全部使用了logback配置：

06:47:20,868 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
06:47:20,868 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
06:47:20,868 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/Users/mac2099/myinfo/code/logdemo/target/classes/logback.xml]
06:47:20,869 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs multiple times on the classpath.
06:47:20,869 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs at [jar:file:/Users/mac2099/mvnRepository/org/example/logbackdemo/1.0-SNAPSHOT/logbackdemo-1.0-SNAPSHOT.jar!/logback.xml]
06:47:20,869 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs at [file:/Users/mac2099/myinfo/code/logdemo/target/classes/logback.xml]
06:47:20,944 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
06:47:20,945 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
06:47:20,950 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [console]
06:47:20,955 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
06:47:20,997 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
06:47:20,998 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [console] to Logger[ROOT]
06:47:20,998 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
06:47:20,999 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@5fe5c6f - Registering current configuration as safe fallback point

new logback2021-10-12 06:47:21 [INFO] com.mac2099.log4j.Main: log4j demo
new logback2021-10-12 06:47:21 [INFO] com.mac2099.log4j2.Main: log4j2 demo
new logback2021-10-12 06:47:21 [INFO] com.mac2099.logback.Main: logback demo

升級log4j至slf4j

引入依賴

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.example</groupId>
    <artifactId>log4jdemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>log4jdemo</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <!--日志 start-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <!--將基礎(chǔ)庫升級到slf4j赋焕，使用slf4j的api打印日志-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.29</version>
        </dependency>

        <!--日志end-->
    </dependencies>
</project>

Main.java

package com.mac2099.log4j;

// 使用slf4j
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Hello world!
 */
public class Main {
    static final Logger LOGGER = LoggerFactory.getLogger(Main.class);
    public static void main(String[] args) {
        LOGGER.info("log4j demo");
    }
}

log4j.properties

log4j.rootLogger=INFO,console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Target=System.out
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%p] %c: %m%n

升級log4j2至slf4j

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.example</groupId>
    <artifactId>log4j2demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.12.1</version>
        </dependency>
        <!--將基礎(chǔ)庫升級到slf4j，使用slf4j的api打印日志-->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j-impl</artifactId>
            <version>2.9.0</version>
        </dependency>
    </dependencies>
</project>

Main.java

package com.mac2099.log4j2;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Hello world!
 */
public class Main {
    static final Logger LOGGER = LoggerFactory.getLogger(Main.class);
    public static void main(String[] args) {
        LOGGER.info("log4j2 demo");
    }
}

log4j2.properties

rootLogger.level=info
rootLogger.appenderRef.stdout.ref=STDOUT
appender.console.type=Console
appender.console.name=STDOUT
appender.console.layout.type=PatternLayout
appender.console.layout.pattern=%d{yyyy-MM-dd HH:mm:ss} [%p] %c: %m%n

最后編輯于：2021.10.20 21:51:02

?著作權(quán)歸作者所有,轉(zhuǎn)載或內(nèi)容合作請聯(lián)系作者

人面猴
序言：七十年代末轧坎，一起剝皮案震驚了整個濱河市宏邮，隨后出現(xiàn)的幾起案子泽示，更是在濱河造成了極大的恐慌缸血，老刑警劉巖，帶你破解...
沈念sama閱讀 206,482評論 6贊 481
死咒
序言：濱河連續(xù)發(fā)生了三起死亡事件械筛，死亡現(xiàn)場離奇詭異捎泻，居然都是意外死亡，警方通過查閱死者的電腦和手機埋哟，發(fā)現(xiàn)死者居然都...
沈念sama閱讀 88,377評論 2贊 382
救了他兩次的神仙讓他今天三更去死
文/潘曉璐我一進店門笆豁，熙熙樓的掌柜王于貴愁眉苦臉地迎上來，“玉大人赤赊，你說我怎么就攤上這事闯狱。” “怎么了抛计？”我有些...
開封第一講書人閱讀 152,762評論 0贊 342
道士緝兇錄：失蹤的賣姜人
文/不壞的土叔我叫張陵哄孤，是天一觀的道長。經(jīng)常有香客問我吹截，道長瘦陈，這世上最難降的妖魔是什么？我笑而不...
開封第一講書人閱讀 55,273評論 1贊 279
?港島之戀（遺憾婚禮）
正文為了忘掉前任波俄，我火速辦了婚禮晨逝，結(jié)果婚禮上，老公的妹妹穿的比我還像新娘懦铺。我一直安慰自己捉貌，他們只是感情好，可當(dāng)我...
茶點故事閱讀 64,289評論 5贊 373
惡毒庶女頂嫁案：這布局不是一般人想出來的
文/花漫我一把揭開白布。她就那樣靜靜地躺著趁窃，像睡著了一般苍匆。火紅的嫁衣襯著肌膚如雪。梳的紋絲不亂的頭發(fā)上棚菊，一...
開封第一講書人閱讀 49,046評論 1贊 285
城市分裂傳說
那天浸踩，我揣著相機與錄音，去河邊找鬼统求。笑死检碗，一個胖子當(dāng)著我的面吹牛，可吹牛的內(nèi)容都是我干的码邻。我是一名探鬼主播折剃，決...
沈念sama閱讀 38,351評論 3贊 400
雙鴛鴦連環(huán)套：你想象不到人心有多黑
文/蒼蘭香墨我猛地睜開眼，長吁一口氣：“原來是場噩夢啊……” “哼像屋！你這毒婦竟也來了怕犁？” 一聲冷哼從身側(cè)響起，我...
開封第一講書人閱讀 36,988評論 0贊 259
萬榮殺人案實錄
序言：老撾萬榮一對情侶失蹤己莺，失蹤者是張志新（化名）和其女友劉穎奏甫，沒想到半個月后，有當(dāng)?shù)厝嗽跇淞掷锇l(fā)現(xiàn)了一具尸體凌受，經(jīng)...
沈念sama閱讀 43,476評論 1贊 300
?護林員之死
正文獨居荒郊野嶺守林人離奇死亡阵子，尸身上長有42處帶血的膿包…… 初始之章·張勛以下內(nèi)容為張勛視角年9月15日...
茶點故事閱讀 35,948評論 2贊 324
?白月光啟示錄
正文我和宋清朗相戀三年，在試婚紗的時候發(fā)現(xiàn)自己被綠了胜蛉。大學(xué)時的朋友給我發(fā)了我未婚夫和他白月光在一起吃飯的照片挠进。...
茶點故事閱讀 38,064評論 1贊 333
活死人
序言：一個原本活蹦亂跳的男人離奇死亡，死狀恐怖誊册，靈堂內(nèi)的尸體忽然破棺而出领突，到底是詐尸還是另有隱情，我是刑警寧澤案怯，帶...
沈念sama閱讀 33,712評論 4贊 323
?日本核電站爆炸內(nèi)幕
正文年R本政府宣布君旦，位于F島的核電站，受9級特大地震影響殴泰，放射性物質(zhì)發(fā)生泄漏于宙。R本人自食惡果不足惜，卻給世界環(huán)境...
茶點故事閱讀 39,261評論 3贊 307
男人毒藥：我在死后第九天來索命
文/蒙蒙一悍汛、第九天我趴在偏房一處隱蔽的房頂上張望捞魁。院中可真熱鬧，春花似錦离咐、人聲如沸谱俭。這莊子的主人今日做“春日...
開封第一講書人閱讀 30,264評論 0贊 19
一樁弒父案，背后竟有這般陰謀
文/蒼蘭香墨我抬頭看了看天上的太陽昆著。三九已至县貌，卻和暖如春，著一層夾襖步出監(jiān)牢的瞬間凑懂，已是汗流浹背煤痕。一陣腳步聲響...
開封第一講書人閱讀 31,486評論 1贊 262
情欲美人皮
我被黑心中介騙來泰國打工，沒想到剛下飛機就差點兒被人妖公主榨干…… 1. 我叫王不留接谨，地道東北人摆碉。一個月前我還...
沈念sama閱讀 45,511評論 2贊 354
代替公主和親
正文我出身青樓，卻偏偏與公主長得像脓豪，于是被迫代替她去往敵國和親巷帝。傳聞我的和親對象是個殘疾皇子，可洞房花燭夜當(dāng)晚...
茶點故事閱讀 42,802評論 2贊 345

log4j/log4j2/logback混用問題

代碼地址

背景說明

情景一

情景二

情景三

升級log4j至slf4j

升級log4j2至slf4j

推薦閱讀更多精彩內(nèi)容