Jmeter干货分享：当你的Log viewer不显示日志时，可能是引入的Jar包冲突导致

问题描述

近期使用Jmeter时发现了一个非常奇怪的问题，就是Jmeter是可以正常使用运行脚本，但是在Log viewer中确没有任何日志，如下图：

问题排查过程

真是百思不得其解啊，在网上各种获取资料，大多数都是说跟Jmeter的log日志配置有关系，按照指引 ，真是一顿操作猛如虎，仔细一看原地杵啊！！！ 没有任何效果！！！ 然后重新解压了同版本（5.4.1）的jmeter（保证jmeter 是干净的），没有出现任何问题，排除了jmeter版本的bug。

这时我又重新启动了我出现问题的jmeter，偶然发现控制台报错，信息如下：

SLF4J: Class path contains multiple SLF4J bindings.

SLF4J: Found binding in [jar:file:/C:/apache-jmeter-5.4.1/lib/activemq-all-5.16.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: Found binding in [jar:file:/C:/apache-jmeter-5.4.1/lib/log4j-slf4j-impl-2.13.3.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.Reload4jLoggerFactory]

 INFO | Setting Locale to en_EN

 INFO | Loading user properties from: user.properties

 INFO | Loading system properties from: system.properties

 INFO | Copyright (c) 1998-2021 The Apache Software Foundation

 INFO | Version 5.4.1

 INFO | java.version=1.8.0_151

 INFO | java.vm.name=Java HotSpot(TM) 64-Bit Server VM

 INFO | os.name=Windows 10

 INFO | os.arch=amd64

 INFO | os.version=10.0

 INFO | file.encoding=GBK

 INFO | java.awt.headless=null

 INFO | Max memory     =2147483648

 INFO | Available Processors =4

 INFO | Default Locale=English (EN)

 INFO | JMeter  Locale=English (EN)

 INFO | JMeterHome=C:\apache-jmeter-5.4.1

 INFO | user.dir  =C:\apache-jmeter-5.4.1\bin

 INFO | PWD       =C:\apache-jmeter-5.4.1\bin

 INFO | IP: 10.32.166.9 Name: PC-20230210MTLI FullName: host.docker.internal

 INFO | search_paths=../lib;../lib/ext;../lib/ext/ice_lib;../lib/ext/js_video_lib;

 INFO | Adding to classpath and loader: ../lib

 INFO | Adding to classpath and loader: ../lib/ext

 INFO | Adding to classpath and loader: ../lib/ext/ice_lib

 INFO | Adding to classpath and loader: ../lib/ext/js_video_lib

================================================================================

Don't use GUI mode for load testing !, only for Test creation and Test debugging.

For load testing, use CLI Mode (was NON GUI):

   jmeter -n -t [jmx file] -l [results file] -e -o [Path to web report folder]

& increase Java Heap to meet your test requirements:

   Modify current env variable HEAP="-Xms1g -Xmx1g -XX:MaxMetaspaceSize=256m" in the jmeter batch file

Check : https://jmeter.apache.org/usermanual/best-practices.html

================================================================================

 INFO | Setting LAF to: laf:com.sun.java.swing.plaf.windows.WindowsLookAndFeel

 INFO | Loaded icon properties from org/apache/jmeter/images/icon.properties

 WARN | Found JAR conflict: ..\lib\accessors-smart-1.2.jar and C:\apache-jmeter-5.4.1\lib\accessors-smart-1.2.jar

 WARN | Found JAR conflict: ..\lib\activemq-all-5.16.5.jar and C:\apache-jmeter-5.4.1\lib\activemq-all-5.16.5.jar

 WARN | Found JAR conflict: ..\lib\apiguardian-api-1.1.0.jar and C:\apache-jmeter-5.4.1\lib\apiguardian-api-1.1.0.jar

 WARN | Found JAR conflict: ..\lib\asm-9.0.jar and C:\apache-jmeter-5.4.1\lib\asm-9.0.jar

 WARN | Found JAR conflict: ..\lib\bsf-2.4.0.jar and C:\apache-jmeter-5.4.1\lib\bsf-2.4.0.jar

 WARN | Found JAR conflict: ..\lib\bsh-2.0b6.jar and C:\apache-jmeter-5.4.1\lib\bsh-2.0b6.jar

 WARN | Found JAR conflict: ..\lib\bshclient.jar and C:\apache-jmeter-5.4.1\lib\bshclient.jar

 WARN | Found JAR conflict: ..\lib\caffeine-2.8.8.jar and C:\apache-jmeter-5.4.1\lib\caffeine-2.8.8.jar

 WARN | Found JAR conflict: ..\lib\checker-qual-3.8.0.jar and C:\apache-jmeter-5.4.1\lib\checker-qual-3.8.0.jar

 WARN | Found JAR conflict: ..\lib\commons-codec-1.15.jar and C:\apache-jmeter-5.4.1\lib\commons-codec-1.15.jar

 WARN | Found JAR conflict: ..\lib\commons-collections-3.2.2.jar and C:\apache-jmeter-5.4.1\lib\commons-collections-3.2.2.jar

 WARN | Found JAR conflict: ..\lib\commons-collections4-4.4.jar and C:\apache-jmeter-5.4.1\lib\commons-collections4-4.4.jar

 WARN | Found JAR conflict: ..\lib\commons-dbcp2-2.8.0.jar and C:\apache-jmeter-5.4.1\lib\commons-dbcp2-2.8.0.jar

 WARN | Found JAR conflict: ..\lib\commons-io-2.8.0.jar and C:\apache-jmeter-5.4.1\lib\commons-io-2.8.0.jar

 WARN | Found JAR conflict: ..\lib\commons-jexl-2.1.1.jar and C:\apache-jmeter-5.4.1\lib\commons-jexl-2.1.1.jar

解决办法

此时问题真像大白，是引入了第三方jar包，产生了版本冲突（该问题是我之前压测mq引入的jar包，当时压测是可以正常执行的，所以就一直没太注意这个问题。。。）

所以大家在使用Jmeter引入第三方jar包进行测试时，一旦发现了一些莫名其妙的问题，可以排查一下是不是自己引入的jar包造成的版本冲突！

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