JMH找不到资源:/META/BenchmarkList

Question

我无法在eclipse内部运行简单的JMH基准测试。Maven依赖关系：

        <dependency>
            <groupId>org.openjdk.jmh</groupId>
            <artifactId>jmh-core</artifactId>
            <version>1.12</version>
        </dependency>
        <dependency>
            <groupId>org.openjdk.jmh</groupId>
            <artifactId>jmh-generator-annprocess</artifactId>
            <version>1.12</version>
        </dependency>

Java代码：

public class BTest {
    @Benchmark
    public void test() {
        // todo
    }

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                 .include(BTest.class.getSimpleName())
                  .build();

        new Runner(opt).run();
    }
}

运行结果：

线程"main“中的异常:错误:无法找到资源:/META/BenchmarkList在org.openjdk.jmh.runner.AbstractResourceReader.getReaders(AbstractResourceReader.java:96) at org.openjdk.jmh.runner.BenchmarkList.find(BenchmarkList.java:104) at org.openjdk.jmh.runner.Runner.internalRun(Runner.java:256) at org.openjdk.jmh.runner.Runner.run(Runner.java:206) at com.test.BTest.main(BTest.java:24)

也许问题是，我是从eclipse运行的。

Answer 1

终于发现了。缺少exec-maven-plugin插件有一个问题。

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>exec-maven-plugin</artifactId>
    <executions>
        <execution>
            <id>run-benchmarks</id>
            <phase>integration-test</phase>
            <goals>
                <goal>exec</goal>
            </goals>
            <configuration>
                <classpathScope>test</classpathScope>
                <executable>java</executable>
                <arguments>
                    <argument>-classpath</argument>
                    <classpath />
                    <argument>org.openjdk.jmh.Main</argument>
                    <argument>.*</argument>
                </arguments>
            </configuration>
        </execution>
    </executions>
</plugin>

Answer 2

如果有人使用Gradle，请将插件添加到您的插件块中：

plugins {
    id 'java'
    id 'me.champeau.jmh' version '0.6.6'
}

然后在依赖项块中添加以下所有内容(查看最新版本的JMH 在这里的Maven)：

dependencies {
    jmh 'org.openjdk.jmh:jmh-core:1.35'
    jmh 'org.openjdk.jmh:jmh-generator-annprocess:1.35'

    // this is the line that solves the missing /META-INF/BenchmarkList error
    jmhAnnotationProcessor 'org.openjdk.jmh:jmh-generator-annprocess:1.35'
}

然后，只需使用以下方法在Gradle中运行您的基准测试：

./gradlew jmh

在IDE中运行

如果您还希望在IDE中而不是通过Gradle运行这些基准测试，则可以执行以下任一操作：

选项1- main方法

只需使用没有额外配置的主方法，IDE就会尊重您的注释配置：

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Benchmark)
@Fork(value = 1)
@Warmup(iterations = 5, timeUnit = TimeUnit.MILLISECONDS, time = 5000)
@Measurement(iterations = 5, timeUnit = TimeUnit.MILLISECONDS, time = 5000)
public class MyBenchmark {

    public static void main(String[] args) throws RunnerException {
        Options options = new OptionsBuilder()
            .include(MyBenchmark.class.getSimpleName())
            .build();
        new Runner(options).run();
    }

    // benchmarks omitted
}

选项2-安装JMH插件

如果您使用的是IntelliJ，请从Preferences > Plugins部分安装Java微带基准插件，然后可以完全省略main方法，IntelliJ将在类名旁边提供一个run按钮：

​

​

Answer 3

pom.xml必须具有以下对(JMH)框架的依赖关系和配置

<properties>
    <jmh.version>1.21</jmh.version>
</properties>
<dependencies>
<dependency>
    <groupId>org.openjdk.jmh</groupId>
    <artifactId>jmh-core</artifactId>
    <version>${jmh.version}</version>
</dependency>
<dependency>
    <groupId>org.openjdk.jmh</groupId>
    <artifactId>jmh-generator-annprocess</artifactId>
    <version>${jmh.version}</version>
</dependency>
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.11</version>
  <scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>java-jmh</finalName>
<plugins>
    <plugin>    
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
            <annotationProcessorPaths>
                <path>
                    <groupId>org.openjdk.jmh</groupId>
                    <artifactId>jmh-generator-annprocess</artifactId>
                    <version>${jmh.version}</version>
                </path>
            </annotationProcessorPaths>
        </configuration>
    </plugin>
    <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <executions>
            <execution>
                <id>run-benchmarks</id>
                <phase>integration-test</phase>
                <goals>
                    <goal>exec</goal>
                </goals>
                <configuration>
                    <classpathScope>test</classpathScope>
                    <executable>java</executable>
                    <arguments>
                        <argument>-classpath</argument>
                        <classpath />
                        <argument>org.openjdk.jmh.Main</argument>
                        <argument>.*</argument>
                    </arguments>
                </configuration>
            </execution>
        </executions>
    </plugin>
</plugins>

之后，转到命令行并运行$mvn干净安装命令