Download and Install Eureka Server Jar for Java 11 and Jakarta EE 9
How to Download Eureka Server Jar and Why You Need It
If you are developing microservices-based applications, you might have heard of Eureka Server. Eureka Server is a service discovery platform that helps you manage and coordinate your microservices in a distributed system. In this article, you will learn what Eureka Server is, what are its benefits, how to download Eureka Server jar from GitHub, how to run it as a Spring Boot application, and how to register and discover microservices with it.
What is Eureka Server and What are Its Benefits
Eureka Server is an application that holds the information about all client-service applications in your system. Every microservice will register into the Eureka Server and Eureka Server knows all the client applications running on each port and IP address. Eureka Server is also known as Discovery Server.
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Eureka Server is a Service Discovery Platform for Microservices
Service discovery is a key component of microservices architecture. Service discovery allows microservices to find and communicate with each other without hard-coding their locations. This makes the system more flexible and resilient to changes.
Eureka Server provides service discovery for microservices. It allows microservices to register themselves at runtime as they appear in the system, and to discover other registered services using a simple REST API. Eureka Server also handles the health checking of the registered services and removes them from the registry if they become unavailable.
Eureka Server Enables Dynamic Scaling, Load Balancing, and Fault Tolerance
One of the advantages of microservices architecture is that it allows for dynamic scaling of the application based on the demand. However, scaling also introduces challenges such as load balancing and fault tolerance. How do you distribute the load among multiple instances of a service? How do you handle failures of some instances without affecting the whole system?
Eureka Server helps you solve these challenges by providing load balancing and fault tolerance features. Eureka Server uses a client-side load balancer called Ribbon that can automatically distribute the requests among multiple service instances based on various criteria such as availability, response time, etc. Eureka Server also uses a circuit breaker called Hystrix that can detect failures of service instances and redirect the requests to fallback methods or other available instances.
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How to Download Eureka Server Jar and Run It as a Spring Boot Application
Eureka Server is an open source project developed by Netflix and hosted on GitHub. You can download the latest release of Eureka Server jar from GitHub and run it as a Spring Boot application on your local machine or on any cloud platform that supports Java.
Prerequisites for Downloading Eureka Server Jar
To download and run Eureka Server jar, you need the following prerequisites:
A Java Development Kit (JDK) version 11 or higher. You can download JDK from [Oracle](^7^) or use any other distribution such as [OpenJDK](^8^).
A Git client to clone the Eureka repository from GitHub. You can download Git from [here](^9^).
A command-line tool such as Terminal on Mac or Linux, or Command Prompt or PowerShell on Windows.
Steps for Downloading Eureka Server Jar from GitHub
To download Eureka Server jar from GitHub, follow these steps:
Open your command-line tool and navigate to a directory where you want to clone the Eureka repository. For example, on Mac or Linux, you can use the following command: cd /Documents
Clone the Eureka repository from GitHub using the following command: git clone
This will create a directory called eureka in your current directory.
Navigate to the eureka-server subdirectory inside the eureka directory using the following command: cd eureka/eureka-server
This is where the Eureka Server jar file is located.
List the contents of the eureka-server directory using the following command: ls
You should see a file called eureka-server-1.10.16-SNAPSHOT.jar. This is the Eureka Server jar file that you need to run.
Steps for Running Eureka Server Jar as a Spring Boot Application
To run Eureka Server jar as a Spring Boot application, follow these steps:
Make sure you have JDK 11 or higher installed and set as your default Java version. You can check your Java version using the following command: java -version
You should see something like this: java version "11.0.12" 2021-07-20 LTS Java(TM) SE Runtime Environment 18.9 (build 11.0.12+8-LTS-237) Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.12+8-LTS-237, mixed mode)
If you see a different version or an error message, you need to install or update your JDK.
Run the Eureka Server jar file using the following command: java -jar eureka-server-1.10.16-SNAPSHOT.jar
This will start the Eureka Server application on port 8761 by default. You should see something like this: ... 2023-06-21 04:15:23.456 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Started Eureka Server 2023-06-21 04:15:23.459 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Setting up periodic instance registry sync task 2023-06-21 04:15:23.460 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Eureka data center value eureka.datacenter is not set, defaulting to default 2023-06-21 04:15:23.460 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Eureka environment value eureka.environment is not set, defaulting to test 2023-06-21 04:15:23.461 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : isAws returned false 2023-06-21 04:15:23.462 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Initialized server context 2023-06-21 04:15:23.462 INFO 1234 --- [ main] c.n.e.r.PeerAwareInstanceRegistryImpl : Got 1 instances from neighboring DS node 2023-06-21 04:15:23.462 INFO 1234 --- [ main] c.n.e.r.PeerAwareInstanceRegistryImpl : Renew threshold is: 1 2023-06-21 04:15:23.462 INFO 1234 --- [ main] c.n.e.r.PeerAwareInstanceRegistryImpl : Changing status to UP 2023-06-21 04:15:23.464 INFO 1234 --- [ main] e.s.EurekaServerInitializerConfiguration : Started Eureka Server ...
This means that the Eureka Server is up and running.
Open your web browser and go to You should see the Eureka Dashboard, which shows the status of the Eureka Server and the registered services.
How to Register and Discover Microservices with Eureka Server
Now that you have downloaded and run the Eureka Server jar, you can use it to register and discover microservices in your system. To do this, you need to add Eureka Client dependency to your microservice project, configure your microservice to register with Eureka Server, and use Eureka Dashboard to view registered microservices.
How to Add Eureka Client Dependency to Your Microservice Project
To register your microservice with Eureka Server, you need to add Eureka Client dependency to your microservice project. Eureka Client is a library that provides the functionality of registering and discovering services with Eureka Server. You can use any Java framework or tool to create your microservice project, such as Spring Boot, Maven, Gradle, etc.
For example, if you are using Spring Boot and Maven, you can add the following dependency