How to Download Jersey 2.x Jar for Your Java RESTful Web Services Project
If you are developing web services in Java, you might have heard of Jersey. Jersey is an open source framework that provides a Java API for RESTful web services (JAX-RS). It simplifies the development and deployment of web services by using annotations and resource classes.
download jersey 2.x jar
Jersey has two major versions: Jersey 1.x and Jersey 2.x. Jersey 1.x is based on JAX-RS 1.1, while Jersey 2.x is based on JAX-RS 2.0 (or 2.1). Jersey 2.x has many advantages over Jersey 1.x, such as improved performance, modularity, extensibility, client API, server-sent events, JSON processing, etc.
In this article, you will learn how to download Jersey 2.x jar for your Java RESTful web services project. You will also learn how to add it as a dependency to your project using Maven or Gradle, and how to create and test a simple RESTful web service with Jersey 2.x.
Prerequisites
Before you can download and use Jersey 2.x jar, you need to have the following prerequisites:
Java SE 8 or later
Maven or Gradle (optional but recommended)
An IDE of your choice (such as Eclipse, IntelliJ IDEA, or VSCode)
Postman (optional but recommended)
Downloading Jersey 2.x Jar
There are two ways to download Jersey 2.x jar: from the official website or from Maven Central Repository.
To download it from the official website, go to [11]( and click on the Download link. You will see a list of available versions of Jersey. Choose the latest stable version (currently 2.34) and click on the zip file link under Bundles. This will download a zip file containing all the jars and documentation for Jersey 2.x.
To download it from Maven Central Repository, go to [10]( and search for org.glassfish.jersey.core. You will see a list of available artifacts for Jersey core modules. Choose the latest stable version (currently 2.34) and click on the jar file link under Files. This will download a jar file containing only the core module of Jersey 2.x.
Adding Jersey 2.x Jar to Your Project
Once you have downloaded Jersey 2.x jar, you need to add it as a dependency to your project. You can do this manually by copying the jar file to your project's lib folder and adding it to your classpath, or you can use Maven or Gradle to manage your dependencies automatically.
If you are using Maven , you need to add the following dependency to your pom.xml file:
```xml
org.glassfish.jersey.core
jersey-server
2.34
``` This will download and include the jersey-server jar and its transitive dependencies to your project.
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If you are using Gradle, you need to add the following dependency to your build.gradle file:
```groovy dependencies implementation 'org.glassfish.jersey.core:jersey-server:2.34' ``` This will do the same as Maven.
Creating a Simple RESTful Web Service with Jersey 2.x
Now that you have added Jersey 2.x jar to your project, you can create a simple RESTful web service with Jersey 2.x using annotations and resource classes.
A resource class is a Java class that represents a web resource and handles HTTP requests. A resource class can have one or more methods annotated with @Path, @GET, @POST, @PUT, @DELETE, etc. to specify the URI path and the HTTP method of the resource. A resource class can also have fields or parameters annotated with @PathParam, @QueryParam, @FormParam, @HeaderParam, etc. to inject values from the request.
For example, let's create a simple resource class that handles GET requests to /hello and returns a greeting message. The code would look something like this:
```java import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.Produces; import javax.ws.rs.core.MediaType; @Path("/hello") public class HelloResource @GET @Produces(MediaType.TEXT_PLAIN) public String sayHello() return "Hello, world!"; ``` To register this resource class with Jersey 2.x, you need to create an application class that extends ResourceConfig and registers the resource class. The code would look something like this:
```java import org.glassfish.jersey.server.ResourceConfig; public class HelloApplication extends ResourceConfig public HelloApplication() register(HelloResource.class); ``` To deploy this application with Jersey 2.x, you need to configure a servlet container (such as Tomcat or Jetty) and map the application class to a URL pattern. For example, if you are using Tomcat, you need to add the following servlet and servlet-mapping elements to your web.xml file:
```xml
jersey
org.glassfish.jersey.servlet.ServletContainer
javax.ws.rs.Application
HelloApplication
jersey
/api/*
``` This will map the application class to the /api URL pattern. You can change this according to your preference.
Testing Your RESTful Web Service with Postman
Once you have deployed your application with Jersey 2.x, you can test your RESTful web service with Postman, a popular tool for sending HTTP requests and inspecting responses.
To test your web service with Postman, follow these steps:
Open Postman and create a new request.
Select GET as the HTTP method and enter the URL of your web service. For example, if you are running Tomcat on localhost:8080 and mapped your application to /api, enter
Click Send and check the response. You should see a status code of 200 OK and a body of Hello, world!.
You can also test other HTTP methods and parameters by changing the request accordingly.
Conclusion
In this article, you learned how to download Jersey 2.x jar for your Java RESTful web services project. You also learned how to add it as a dependency to your project using Maven or Gradle, and how to create and test a simple RESTful web service with Jersey 2.x.
Jersey 2.x is a powerful and easy-to-use framework for developing and deploying web services in Java. It supports JAX-RS 2.0 (or 2.1) features and provides many additional modules and extensions for JSON processing, server-sent events, client API, etc.
If you want to learn more about Jersey 2.x, you can check out the official website, the Jersey 2.x User Guide, and the Swagger Core Jersey 2.x Project Setup. These resources will help you learn more about the features, modules, extensions, and best practices of Jersey 2.x.
FAQs
Here are some frequently asked questions about Jersey 2.x:
What is the difference between Jersey 1.x and Jersey 2.x?
Jersey 1.x is based on JAX-RS 1.1, while Jersey 2.x is based on JAX-RS 2.0 (or 2.1). Jersey 2.x has many advantages over Jersey 1.x, such as improved performance, modularity, extensibility, client API, server-sent events, JSON processing, etc.
How do I migrate from Jersey 1.x to Jersey 2.x?
There is no direct migration path from Jersey 1.x to Jersey 2.x, as they are not compatible. You need to rewrite your code and configuration to use the new API and features of Jersey 2.x. You can refer to the Migration Guide for more details.
What are the dependencies of Jersey 2.x?
Jersey 2.x depends on Java SE 8 or later, and optionally on Maven or Gradle for dependency management. It also depends on other libraries such as HK2, javax.inject, javax.annotation, javax.validation, etc. You can find the complete list of dependencies in the pom.xml file of each module.
How do I use JSON with Jersey 2.x?
Jersey 2.x supports JSON processing with various modules and extensions, such as MOXy, Jackson, Jettison, JSON-P, JSON-B, etc. You can choose the one that suits your needs and preferences. You can refer to the JSON Support for more details.
How do I use server-sent events with Jersey 2.x?
Jersey 2.x supports server-sent events (SSE) with the jersey-media-sse module. SSE is a technology that allows a server to push data to a client over HTTP. You can use SSE to create real-time applications such as chat, news feed, notifications, etc. You can refer to the Server-Sent Events Support for more details.
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