jmeter报错java.lang.NoClassDefFoundError: Could not initialize class io.grpc.netty.NettyChannelBuilder

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博客讲述了在使用JMeter进行远程负载测试RocksDB服务接口时遇到的Java运行时错误NoClassDefFoundError，该错误与io.grpc.netty.NettyChannelBuilder类初始化失败有关。博主分析了可能的解决方案，包括检查jar包冲突、更新依赖版本以及尝试使用纯净版JMeter。尽管尝试了多种方法，问题依然存在，最终通过使用纯净版JMeter5.4.1解决了问题。

背景：使用jmeter远程负载机压测rocksdb(研发在rocksdb上封了一层服务，压测的是服务接口)时，jmeter后台报以下错误：

2021-12-09 18:02:06,970 ERROR o.a.j.JMeter: Uncaught exception in thread Thread[线程组 1-1,6,main]
java.lang.NoClassDefFoundError: Could not initialize class io.grpc.netty.NettyChannelBuilder
   at io.grpc.netty.NettyChannelProvider.builderForTarget(NettyChannelProvider.java:43) ~[rocksdb-1.0-SNAPSHOT-jar-with-dependencies.jar:?]
   at io.grpc.netty.NettyChannelProvider.builderForTarget(NettyChannelProvider.java:24) ~[rocksdb-1.0-SNAPSHOT-jar-with-dependencies.jar:?]
   at io.grpc.ManagedChannelBuilder.forTarget(ManagedChannelBuilder.java:76) ~[rocksdb-1.0-SNAPSHOT-jar-with-dependencies.jar:?]
   at com.zhaopin.perf.RocksDBPerf.setupTest(RocksDBPerf.java:29) ~[rocksdb-1.0-SNAPSHOT-jar-with-dependencies.jar:?]
   at org.apache.jmeter.protocol.java.sampler.JavaSampler.sample(JavaSampler.java:194) ~[ApacheJMeter_java.jar:5.4.1]
   at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:638) ~[ApacheJMeter_core.jar:5.4.1]
   at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:558) ~[ApacheJMeter_core.jar:5.4.1]
   at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:489) ~[ApacheJMeter_core.jar:5.4.1]
   at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:256) ~[ApacheJMeter_core.jar:5.4.1]
   at java.lang.Thread.run(Unknown Source) [?:1.8.0_291]

详细看了下错误，第一感觉是jar包冲突（因为在本地环境idea中调试脚本正常）

我本地的maven依赖信息如下：

<?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>rocksdb</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>3.17.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java-util -->
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java-util</artifactId>
            <version>3.17.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/io.grpc/grpc-all -->
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-all</artifactId>
            <version>1.40.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.jmeter</groupId>
            <artifactId>ApacheJMeter_core</artifactId>
            <version>3.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.jmeter</groupId>
            <artifactId>ApacheJMeter_java</artifactId>
            <version>3.2</version>
        </dependency>
        <!--protobuf相关end-->
    </dependencies>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <build>
        <extensions>
            <extension>
                <groupId>kr.motd.maven</groupId>
                <artifactId>os-maven-plugin</artifactId>
                <version>1.5.0.Final</version>
            </extension>
        </extensions>

        <plugins>
            <plugin>
                <groupId>org.xolstice.maven.plugins</groupId>
                <artifactId>protobuf-maven-plugin</artifactId>
                <version>0.5.0</version>
                <configuration>
                    <protocArtifact>
                        com.google.protobuf:protoc:3.1.0:exe:${os.detected.classifier}
                    </protocArtifact>
                    <pluginId>grpc-java</pluginId>
                    <pluginArtifact>
                        io.grpc:protoc-gen-grpc-java:1.11.0:exe:${os.detected.classifier}
                    </pluginArtifact>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>compile-custom</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>

                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>com.zhaopin.perf.RocksDBPerf</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

        </plugins>
    </build>
</project>

解决思路：

1、手工把错误涉及的jar包（grpc-netty-1.40.1.jar）放到 jmeter的 bin/exp目录下-------错误依旧

2、认为单个jar包版本冲突问题，就将grpc-netty包单独在pom文件中引入最新版本（由1.40.1升级为1.42.1）-------错误依旧

3、重新从jmeter官网，下载了个纯净版jmeter5.4.1，把压测脚本打包成的jar放到bin/exp目录下-----调用压测接口成功。