How can we use Spring Cloud Sleuth with spring MVC project?

Question

I am trying to use spring cloud sleuth with spring web mvc project. We are sending the request from spring web mvc to another spring boot project. I need to have the traceID and spanId to display in the UI. How can we achieve this?

EDIT

POM.xml for the spring boot application. I am using the latest version of Spring Boot and added the dependency of spring cloud sleuth.

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.test</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>

<properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Hoxton.SR1</spring-cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <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>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </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>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

Web MVC code: I am using spring rest template and calling the spring boot service from the spring web mvc application.

@Controller
public class HelloController {

    @Autowired
    RestTemplate restTemplate;

    private Logger logger = Logger.getLogger(HelloController.class);

    @GetMapping("/hello")
    public String hello(Model model) {
        logger.info("Hello from controller");
        ResponseEntity<String> entity = restTemplate.getForEntity("http://localhost:8092/test", String.class);
        String response = entity.getBody();
        logger.info("Response from Service: "+ response);
        model.addAttribute("name", "Test");
        return "welcome";
    }
}

Answer 1

In order to do that, you need to inject the Tracer bean and then if you call tracer.currentSpan().context().traceIdString() and tracer.currentSpan().context().spanIdString().