How to Set Up Jaeger on Spring Boot Java Application

How to Set Up Jaeger on Spring Boot Java Application

Jaeger is an open-source distributed tracing system that can be used to monitor and troubleshoot microservices-based distributed systems. In this article, we will see how to set up Jaeger on a Spring Boot Java application.

Prerequisites

Before we start, make sure that you have the following prerequisites:

• A Java Development Kit (JDK) version 8 or higher installed
• A Spring Boot application
• Docker installed on your machine

Step 1: Add Jaeger Dependencies

To get started with Jaeger, we need to add the following dependencies to our pom.xml file:

<dependency>
    <groupId>io.opentracing.contrib</groupId>
    <artifactId>opentracing-spring-jaeger-cloud-starter</artifactId>
    <version>3.0.0</version>
</dependency>
<dependency>
    <groupId>io.jaegertracing</groupId>
    <artifactId>jaeger-client</artifactId>
    <version>1.7.0</version>
</dependency>

The opentracing-spring-jaeger-cloud-starter dependency provides the necessary Spring Boot auto-configuration classes to set up Jaeger. The jaeger-client dependency provides the Jaeger client library.

Step 2: Configure Jaeger

Next, we need to configure Jaeger in our application. We can do this by adding the following properties to the application.properties file:

opentracing.jaeger.service-name=your-service-name
opentracing.jaeger.udp-sender.host=jaeger
opentracing.jaeger.udp-sender.port=6831
opentracing.jaeger.enabled=true

Here, your-service-name is the name of your Spring Boot application. We also specify the host and port of the Jaeger agent, which is running as a Docker container. Note that we have enabled Jaeger by setting the opentracing.jaeger.enabled property to true.

Step 3: Start Jaeger Agent

Before we run our Spring Boot application, we need to start the Jaeger agent as a Docker container. We can do this by running the following command:

docker run -d -p 5775:5775/udp -p 6831:6831/udp -p 6832:6832/udp -p 5778:5778 -p 16686:16686 -p 14268:14268 jaegertracing/all-in-one:1.7

This will start the Jaeger agent as a Docker container and expose the necessary ports.

Step 4: Run Spring Boot Application

Finally, we can run our Spring Boot application using the following command:

./mvnw spring-boot:run

Once the application is running, we can navigate to the Jaeger UI at http://localhost:16686 to view the traces.

Conclusion

In this article, we have seen how to set up Jaeger on a Spring Boot Java application. We added the necessary dependencies, configured Jaeger, started the Jaeger agent as a Docker container, and ran our Spring Boot application. With Jaeger, we can monitor and troubleshoot our microservices-based distributed systems.