我希望通过 jMeter extension 向 Kafka 消费者发送动态生成的消息来对 Kafka 进行负载测试。 ，由 jMeter plugin manager 安装.
我的 Kafka 已完美配置、设置和运行。我关注了these instructions设置 Kafka 测试计划并运行它，但每次设置并运行它时，我都会在日志中收到此错误:
2017/03/23 10:35:48 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.assertions.BSFAssertion
2017/03/23 10:35:49 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.extractor.BSFPostProcessor
2017/03/23 10:35:49 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.modifiers.BSFPreProcessor
2017/03/23 10:35:49 INFO - jmeter.protocol.http.sampler.HTTPSamplerBase: Parser for text/html is org.apache.jmeter.protocol.http.parser.LagartoBasedHtmlParser
2017/03/23 10:35:49 INFO - jmeter.protocol.http.sampler.HTTPSamplerBase: Parser for application/xhtml+xml is org.apache.jmeter.protocol.http.parser.LagartoBasedHtmlParser
2017/03/23 10:35:49 INFO - jmeter.protocol.http.sampler.HTTPSamplerBase: Parser for application/xml is org.apache.jmeter.protocol.http.parser.LagartoBasedHtmlParser
2017/03/23 10:35:49 INFO - jmeter.protocol.http.sampler.HTTPSamplerBase: Parser for text/xml is org.apache.jmeter.protocol.http.parser.LagartoBasedHtmlParser
2017/03/23 10:35:49 INFO - jmeter.protocol.http.sampler.HTTPSamplerBase: Parser for text/vnd.wap.wml is org.apache.jmeter.protocol.http.parser.RegexpHTMLParser
2017/03/23 10:35:49 INFO - jmeter.protocol.http.sampler.HTTPSamplerBase: Parser for text/css is org.apache.jmeter.protocol.http.parser.CssParser
2017/03/23 10:35:49 INFO - jorphan.exec.KeyToolUtils: keytool found at 'keytool'
2017/03/23 10:35:49 INFO - jmeter.protocol.http.proxy.ProxyControl: HTTP(S) Test Script Recorder SSL Proxy will use keys that support embedded 3rd party resources in file /Users/jordan/Downloads/apache-jmeter-3.1/bin/proxyserver.jks
2017/03/23 10:35:49 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.protocol.java.sampler.BSFSampler
2017/03/23 10:35:49 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.protocol.mongodb.config.MongoSourceElement
2017/03/23 10:35:49 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.protocol.mongodb.sampler.MongoScriptSampler
2017/03/23 10:35:49 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.timers.BSFTimer
2017/03/23 10:35:49 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.visualizers.BSFListener
2017/03/23 10:35:49 INFO - jmeter.gui.util.MenuFactory: Skipping org.apache.jmeter.visualizers.MonitorHealthVisualizer
2017/03/23 10:35:49 INFO - jmeter.samplers.SampleResult: Note: Sample TimeStamps are START times
2017/03/23 10:35:49 INFO - jmeter.samplers.SampleResult: sampleresult.default.encoding is set to ISO-8859-1
2017/03/23 10:35:49 INFO - jmeter.samplers.SampleResult: sampleresult.useNanoTime=true
2017/03/23 10:35:49 INFO - jmeter.samplers.SampleResult: sampleresult.nanoThreadSleep=5000
2017/03/23 10:38:54 INFO - jmeter.services.FileServer: Default base='/Users/jordan'
2017/03/23 10:38:54 INFO - jmeter.gui.action.Load: Loading file: /Users/jordan/Downloads/apache-jmeter-3.1/bin/test-plans/kafka-test.jmx
2017/03/23 10:38:54 INFO - jmeter.services.FileServer: Set new base='/Users/jordan/Downloads/apache-jmeter-3.1/bin/test-plans'
2017/03/23 10:38:54 INFO - jmeter.save.SaveService: Testplan (JMX) version: 2.2. Testlog (JTL) version: 2.2
2017/03/23 10:38:54 INFO - jmeter.save.SaveService: Using SaveService properties file encoding UTF-8
2017/03/23 10:38:54 INFO - jmeter.save.SaveService: Using SaveService properties version 3.1
2017/03/23 10:38:54 INFO - jmeter.save.SaveService: All converter versions present and correct
2017/03/23 10:38:54 INFO - jmeter.save.SaveService: Loading file: /Users/jordan/Downloads/apache-jmeter-3.1/bin/test-plans/kafka-test.jmx
2017/03/23 10:38:54 INFO - jmeter.services.FileServer: Set new base='/Users/jordan/Downloads/apache-jmeter-3.1/bin/test-plans'
2017/03/23 10:39:04 INFO - jmeter.engine.StandardJMeterEngine: Running the test!
2017/03/23 10:39:04 INFO - jmeter.samplers.SampleEvent: List of sample_variables: []
2017/03/23 10:39:04 INFO - jmeter.samplers.SampleEvent: List of sample_variables: []
2017/03/23 10:39:04 INFO - jmeter.protocol.java.sampler.JavaSampler: Created class: co.signal.kafkameter.KafkaProducerSampler. Uses tearDownTest: true
2017/03/23 10:39:04 INFO - jmeter.gui.util.JMeterMenuBar: setRunning(true,*local*)
2017/03/23 10:39:05 INFO - jmeter.engine.StandardJMeterEngine: Starting ThreadGroup: 1 : Thread Group
2017/03/23 10:39:05 INFO - jmeter.engine.StandardJMeterEngine: Starting 1 threads for group Thread Group.
2017/03/23 10:39:05 INFO - jmeter.engine.StandardJMeterEngine: Thread will continue on error
2017/03/23 10:39:05 INFO - jmeter.threads.ThreadGroup: Starting thread group number 1 threads 1 ramp-up 1 perThread 1000.0 delayedStart=false
2017/03/23 10:39:05 INFO - jmeter.threads.ThreadGroup: Started thread group number 1
2017/03/23 10:39:05 INFO - jmeter.engine.StandardJMeterEngine: All thread groups have been started
2017/03/23 10:39:05 INFO - jmeter.threads.JMeterThread: Thread started: Thread Group 1-1
2017/03/23 10:39:05 ERROR - jmeter.threads.JMeterThread: Test failed! java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at kafka.utils.Logging$class.logger(Logging.scala:24)
at kafka.utils.VerifiableProperties.logger(VerifiableProperties.scala:23)
at kafka.utils.Logging$class.info(Logging.scala:66)
at kafka.utils.VerifiableProperties.info(VerifiableProperties.scala:23)
at kafka.utils.VerifiableProperties.verify(VerifiableProperties.scala:180)
at kafka.producer.ProducerConfig.<init>(ProducerConfig.scala:57)
at co.signal.kafkameter.KafkaProducerSampler.setupTest(KafkaProducerSampler.java:90)
at org.apache.jmeter.protocol.java.sampler.JavaSampler.sample(JavaSampler.java:193)
at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:475)
at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:418)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:249)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 12 more
2017/03/23 10:39:05 INFO - jmeter.threads.JMeterThread: Thread finished: Thread Group 1-1
2017/03/23 10:39:05 INFO - jmeter.engine.StandardJMeterEngine: Notifying test listeners of end of test
2017/03/23 10:39:05 WARN - jmeter.engine.StandardJMeterEngine: Error encountered during shutdown of org.apache.jmeter.protocol.java.sampler.JavaSampler@51cd3642 java.lang.NullPointerException
at co.signal.kafkameter.KafkaProducerSampler.teardownTest(KafkaProducerSampler.java:96)
at org.apache.jmeter.protocol.java.sampler.JavaSampler.testEnded(JavaSampler.java:292)
at org.apache.jmeter.engine.StandardJMeterEngine.notifyTestListenersOfEnd(StandardJMeterEngine.java:216)
at org.apache.jmeter.engine.StandardJMeterEngine.run(StandardJMeterEngine.java:437)
at java.lang.Thread.run(Thread.java:745)
2017/03/23 10:39:05 INFO - jmeter.gui.util.JMeterMenuBar: setRunning(false,*local*)
所以，我得到的错误表明它找不到org/apache/log4j/logger，但我不确定如何解决这个问题。我看过other known issues其他人也遇到过，想看看是否和我的类似，但没有结果。我想也许我的测试计划写错了，但我找不到任何问题。对于我做错了什么有什么建议吗？
最佳答案
java.lang.ClassNotFoundException This exception indicates that the class was not found on the classpath. This indicates that we were trying to load the class definition, and the class did not exist on the classpath.
尝试添加 log4j jar。
如果是 Maven 项目，您可以添加以下依赖项，随时更改为合适的版本。
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version>
</dependency>
如果存在版本冲突，也可能会发生这种情况，因为 log4j jar 可能捆绑在另一个 jar 中，请尝试找出并排除 log4j jar。
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.10</artifactId>
<version>0.8.1.1</version>
<exclusions>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</dependency>
关于java - Kafkameter NoClassDefFoundError，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42982179/