Micrometer Tracing traceId not passing into downstream

Let's say I have two Microservice. When trying to use Micrometer, traceId was not traversing to the next microservice.

I am providing code of cart service which will call product service.

The traceId which gets printed in cart and product service are different.

Not able to understand the issue.

server.port=8081
spring.application.name=product_catalog
logging.level.org.springframework.web.servlet.DispatcherServlet=TRACE
management.tracing.sampling.probability=1.0
management.endpoints.web.exposure.include=*
logging.pattern.level=%5p [${spring.application.name:},%X{traceId:-},%X{spanId:-}]



import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class ShoppingCartService {

@Autowired
RestTemplate restTemplate;
Logger logger = LoggerFactory.getLogger(ShoppingCartService.class);

@GetMapping("/cart")
public String addItem() {
    logger.info("add item - process started");
    final Product itemProduct = 
restTemplate.getForObject("http://localhost:8081/product",
            Product.class);
    System.out.println("itemProduct" + itemProduct);
    return "ok";
    }
}






     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-aop</artifactId>
    </dependency>
    <dependency>
        <groupId>io.micrometer</groupId>
        <artifactId>micrometer-tracing-bridge-brave</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

After migrating to Spring Boot 3, you need to add an interceptor to RestTemplate.

This worked for me.

Add the library to pom.xml

<dependency>
    <groupId>io.zipkin.brave</groupId>
    <artifactId>brave-instrumentation-spring-web</artifactId>
</dependency>

Add TracingClientHttpRequestInterceptor to RestTemplate

import brave.Tracing;
import brave.http.HttpTracing;
import brave.spring.web.TracingClientHttpRequestInterceptor;

@Bean
public HttpTracing create(Tracing tracing) {
    return HttpTracing
        .newBuilder(tracing)
        .build();
}

@Bean
public RestTemplate restTemplate(HttpTracing httpTracing) {
    return new RestTemplateBuilder()           
            .interceptors(TracingClientHttpRequestInterceptor.create(httpTracing))
        .build();
}

I hope this helps!

I am getting same issue of traceid not being traversing between services. I have used following dependencies. I have injected RestTemplate with above approach

<dependencies>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
	<groupId>io.micrometer</groupId>
	<artifactId>micrometer-tracing</artifactId>
	<version>1.1.5</version>
</dependency>
<dependency>
	<groupId>io.micrometer</groupId>
	<artifactId>micrometer-tracing-bridge-brave</artifactId>
</dependency>	
<dependency>
	<groupId>io.zipkin.brave</groupId>
	<artifactId>brave-instrumentation-spring-web</artifactId>
</dependency>
<dependency>
	<groupId>io.zipkin.reporter2</groupId>
	<artifactId>zipkin-reporter-brave</artifactId>
	<version>2.15.1</version>
</dependency>

Please help to resolve