How to Download JMS 2.0 Jar
If you are a Java developer who wants to use the Java Message Service (JMS) API to communicate with messaging systems, you might be wondering how to download the latest version of the JMS jar file, which is JMS 2.0. In this article, we will explain what JMS 2.0 is, what features and benefits it offers, and how to download and use it in your application.
What is JMS 2.0?
JMS 2.0 is the first update to the JMS specification since version 1.1 was released in 2002. It is part of the Java EE 7 platform and can be used in Java EE Web or EJB applications, or it can be used standalone in a Java SE environment.
download jms 2.0 jar
JMS 2.0 introduces a new API for sending and receiving messages that reduces the amount of code a developer must write. It also supports resource injection, which allows the application server to take care of the creation and management of JMS objects, simplifying the application even further.
Features of JMS 2.0
The new API is known as the simplified API. It consists of three new interfaces: JMSContext, JMSProducer, and JMSConsumer:
JMSContext replaces the separate Connection and Session objects in the classic API with a single object.
JMSProducer is a lightweight replacement for the MessageProducer object in the classic API. It allows message delivery options, headers, and properties to be configured using method chaining (sometimes known as a builder pattern).
JMSConsumer replaces the MessageConsumer object in the classic API and is used in a similar way.
The simplified API offers all the features of the classic API plus some additional features, such as:
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Support for asynchronous message delivery using a CompletionListener object.
Support for shared subscriptions for topics, which allow multiple consumers to share a single subscription.
Support for delivery delay, which allows messages to be sent with a specified delay before they are delivered.
Support for delivery count, which allows messages to be annotated with the number of times they have been delivered.
Benefits of JMS 2.0
The main benefit of JMS 2.0 is that it makes it easier and faster to develop applications that use messaging systems. By using the simplified API, developers can write fewer lines of code, avoid boilerplate code, and focus on the business logic of their applications.
Another benefit of JMS 2.0 is that it supports resource injection for applications that run in a Java EE application server. This means that developers do not have to create and manage JMS objects manually, but can rely on the application server to do it for them. This reduces the complexity and improves the portability of the application.
How to Download JMS 2.0 Jar for Different Environments
In order to use JMS 2.0 in your application, you need to download the jms.jar file that contains the JMS 2.0 interfaces and add it to your classpath. The way to download the jms.jar file depends on the environment you are using for your application.
Downloading JMS 2.0 Jar for Java EE Applications
If you are developing a Java EE application that runs in a Java EE 7 compliant application server, such as GlassFish, WildFly, or WebLogic, you do not need to download the jms.jar file separately. The application server already provides the JMS 2.0 interfaces as part of the Java EE platform.
All you need to do is to use resource injection to obtain a JMSContext object from the application server. You can do this by using the @Inject annotation on a field or a method parameter of type JMSContext. For example:
import javax.inject.Inject; import javax.jms.JMSContext; public class MyBean @Inject private JMSContext context; // use context to send and receive messages
You can also specify the name of the connection factory and the destination that you want to use with the @JMSConnectionFactory and @JMSDestination annotations respectively. For example:
import javax.inject.Inject; import javax.jms.JMSContext; import javax.jms.JMSConnectionFactory; import javax.jms.JMSDestination; public class MyBean @Inject @JMSConnectionFactory("jms/MyConnectionFactory") @JMSDestination("jms/MyQueue") private JMSContext context; // use context to send and receive messages
Using Resource Injection
Resource injection is the preferred way to obtain JMS objects in a Java EE application, as it simplifies the code and makes it more portable. However, if you need more control over the creation and configuration of JMS objects, you can also use JNDI lookup to obtain them from the application server.
Using JNDI Lookup
JNDI lookup is an alternative way to obtain JMS objects in a Java EE application, if resource injection is not available or suitable for your needs. You can use JNDI lookup to obtain a connection factory and a destination from the application server's naming service, and then use them to create a JMSContext object. For example:
import javax.jms.ConnectionFactory; import javax.jms.Destination; import javax.jms.JMSContext; import javax.naming.InitialContext; public class MyBean private JMSContext context; public void init() throws Exception // obtain connection factory and destination from JNDI InitialContext ic = new InitialContext(); ConnectionFactory cf = (ConnectionFactory) ic.lookup("jms/MyConnectionFactory"); Destination dest = (Destination) ic.lookup("jms/MyQueue"); // create JMSContext object context = cf.createContext(); // use context to send and receive messages
Downloading JMS 2.0 Jar for Java SE Applications
If you are developing a standalone Java SE application that uses JMS 2.0, you need to download the jms.jar file and add it to your classpath. You also need to download and add the jar files of the specific messaging provider that you want to use, such as ActiveMQ, HornetQ, or RabbitMQ.
There are two ways to download the jms.jar file for Java SE applications: using Maven dependency or using direct download link.
Using Maven Dependency
If you are using Maven as your build tool, you can add the following dependency to your pom.xml file to download the jms.jar file automatically:
<dependency> <groupId>javax.jms</groupId> <artifactId>javax.jms-api</artifactId> <version>2.0</version> </dependency>
You also need to add the dependencies of the messaging provider that you want to use, according to their documentation.
Using Direct Download Link
If you are not using Maven, you can download the jms.jar file directly from the following link:
You also need to download and add the jar files of the messaging provider that you want to use, according to their documentation.
How to Use JMS 2.0 Jar in Your Application
Once you have downloaded and added the jms.jar file and the messaging provider jar files to your classpath, you can start using JMS 2.0 in your application. Here are some basic steps to follow:
Creating a JMSContext Object
The first step is to create a JMSContext object, which represents the connection and session to the messaging system. You can do this by using the createContext() method of the ConnectionFactory object that you obtain from the messaging provider. For example:
import javax.jms.ConnectionFactory; import javax.jms.JMSContext; // obtain connection factory from messaging provider ConnectionFactory cf = ...; // create JMSContext object JMSContext context = cf.createContext();
You can also specify the session mode and the user credentials as parameters of the createContext() method, if needed. For example:
import javax.jms.ConnectionFactory; import javax.jms.JMSContext; import javax.jms.JMSException; // obtain connection factory from messaging provider ConnectionFactory cf = ...; // create JMSContext object with auto-acknowledge mode and user credentials JMSContext context = cf.createContext("user", "password", JMSContext.AUTO_ACKNOWLEDGE);
Sending and Receiving Messages with JMSProducer and JMSConsumer Objects
The next step is to create a JMSProducer object and a JMSConsumer object, which are used to send and receive messages respectively. You can do this by using the createProducer() and createConsumer() methods of the JMSContext object. For example:
import javax.jms.Destination; import javax.jms.JMSConsumer; import javax.jms.JMSContext; import javax.jms.JMSProducer; // obtain destination from messaging provider Destination dest = ...; // create JMSProducer object JMSProducer producer = context.createProducer(); // create JMSConsumer object JMSConsumer consumer = context.createConsumer(dest);
You can also specify message delivery options, headers, and properties for the producer and the consumer by using the methods of the JMSProducer and JMSConsumer interfaces. For example:
import javax.jms.Destination; import javax.jms.JMSConsumer; import javax.jms.JMSContext; import javax.jms.JMSProducer; import javax.jms.Message; // obtain destination from messaging provider Destination dest = ...; // create JMSProducer object with delivery delay of 10 seconds JMSProducer producer = context.createProducer().setDeliveryDelay(10000); // create JMSConsumer object with message selector JMSConsumer consumer = context.createConsumer(dest, "priority > 5"); // send a text message with priority header producer.setPriority(9).send(dest, "Hello"); // receive a text message Message message = consumer.receive();
Using Simplified API and Method Chaining
One of the advantages of JMS 2.0 is that it allows you to use a simplified API and method chaining to write concise and readable code. For example, you can use the following code to send and receive a text message in one line:
import javax.jms.Destination; import javax.jms.JMSContext; // obtain destination from messaging provider Destination dest = ...; // send and receive a text message in one line String reply = context.createProducer().send(dest, "Hello").createReplyToConsumer().receiveBody(String.class);
This code uses the following methods of the JMSProducer interface:
send(Destination destination, String body): sends a text message to the specified destination.
createReplyToConsumer(): creates a temporary destination and a consumer for receiving replies.
receiveBody(Class c): receives a message and returns its body as an instance of the specified class.
Conclusion
In this article, we have learned what JMS 2.0 is, what features and benefits it offers, and how to download and use it in your application. We have seen how to use resource injection or JNDI lookup to obtain JMS objects in a Java EE application, and how to use Maven dependency or direct download link to obtain them in a Java SE application. We have also seen how to use the simplified API and method chaining to write less code and more readable code.
Summary of the Article
The main points of this article are:
JMS 2.0 is the latest version of the Java Message Service API that simplifies the development of applications that use messaging systems.
JMS 2.0 introduces a new simplified API that consists of three new interfaces: JMSContext, JMSProducer, and JMSConsumer.
JMS 2.0 supports resource injection for Java EE applications, which allows the application server to create and manage JMS objects for the application.
JMS 2.0 supports method chaining for JMSProducer and JMSConsumer objects, which allows message delivery options, headers, and properties to be configured using a builder pattern.
JMS 2.0 supports some additional features, such as asynchronous message delivery, shared subscriptions, delivery delay, and delivery count.
To use JMS 2.0 in your application, you need to download the jms.jar file and add it to your classpath. You can use Maven dependency or direct download link to obtain the jms.jar file for Java SE applications. You do not need to download the jms.jar file for Java EE applications, as it is provided by the application server.
FAQs
Here are some frequently asked questions about JMS 2.0:
What is the difference between JMS 2.0 and JMS 1.1?
The main difference between JMS 2.0 and JMS 1.1 is that JMS 2.0 introduces a new simplified API that reduces the amount of code a developer must write to use messaging systems. JMS 2.0 also supports some additional features that are not available in JMS 1.1, such as asynchronous message delivery, shared subscriptions, delivery delay, and delivery count.
Can I use JMS 2.0 with any messaging provider?
You can use JMS 2.0 with any messaging provider that supports the JMS 2.0 specification and provides a connection factory implementation for it. Some examples of messaging providers that support JMS 2.0 are ActiveMQ, HornetQ, RabbitMQ, and IBM MQ.
Can I use JMS 2.0 with any Java version?
You can use JMS 2.0 with any Java version that supports the Java SE 7 platform or higher. This includes Java SE 7, Java SE 8, Java SE 9, and Java SE 10.
Can I mix the simplified API and the classic API in my application?
Yes, you can mix the simplified API and the classic API in your application, as long as you use them with the same connection factory and destination objects. However, it is recommended to use the simplified API whenever possible, as it offers more advantages and less complexity than the classic API.
Where can I find more information about JMS 2.0?
You can find more information about JMS 2.0 from the following sources:
The official specification document:
The official user guide:
The official tutorial:
The official reference implementation:
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