如何修复‘brave.propagation.CurrentTraceContext$ScopeDecorator'？：ClassNotFoundException

Question

我在我的项目中使用了spring-cloud-starter-sleuth。然后，当它启动时，它将显示ClassNotFoundException:brave.propagation.CurrentTraceContext$ScopeDecorator

这是SpringBoot2.1.2.RELEASE和Spring Greenwich.RC2的一个非常开始的项目；在我添加依赖‘spring - cloud -starter-sleuth’之前，它运行得很好；

我启动了一个只有spring- cloud -starter-sleuth的新项目(Spring Cloud INITIALIZR demo)，但它仍然不起作用；

POM为：

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.RC2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

代码就是：

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

删除的原因是: brave.propagation.CurrentTraceContext$ScopeDecorator at java.net.URLClassLoader.findClass(URLClassLoader.java:382) java.lang.ClassNotFoundException at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~na:1.8.0_191 at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~na:1.8.0_191 ... 25个常见的帧被省略

Answer 1

或者，您可以使用spring cloud Greenwich.RELEASE版本来修复您的ClassNotFoundException问题

Answer 2

将下面的依赖项添加到您的dependencyManagement部分，然后重试！

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-sleuth</artifactId>
    <version>2.0.2.RELEASE</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>