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Download the WAS Liberty Runtime: Step-by-Step Instructions and Tips


How to Download the WAS Liberty Runtime




WAS Liberty is a lightweight Java runtime that is ideal for building microservices, modern monolithic applications, and anything in between. It is built on the open source Open Liberty runtime and is compatible with MicroProfile and Jakarta EE. In this article, you will learn how to download and install WAS Liberty on your system, and how to verify that it is working properly.




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Why Use WAS Liberty?




WAS Liberty has many advantages over traditional application servers, such as:


  • It is fast and easy to install, configure, and update.



  • It has a small disk and memory footprint, which reduces infrastructure and license costs.



  • It supports a modular structure based on features, which enables you to enable only the runtime capabilities that your application needs.



  • It provides a flexible and consistent development and deployment experience across different platforms and cloud environments.



  • It supports the latest open standards, such as MicroProfile, Jakarta EE, and Java EE, which helps you avoid vendor lock-in and leverage community innovation.



How to Download and Install WAS Liberty




There are multiple ways to download and install WAS Liberty on your system, depending on your preferences and needs. Here are some of the most common methods:


Using Installation Manager




Installation Manager is a tool that allows you to manage installations, updates, and rollbacks of IBM products. You can use Installation Manager to install WAS Liberty from an online or offline repository, or from a local directory. You can also use Installation Manager to install additional features from the Liberty Repository. To use Installation Manager, you need to have a supported Java runtime environment (JRE) or Java SDK installed on your system. For more details on how to use Installation Manager, see Installing Liberty using Installation Manager.


Using Downloaded Archives




You can also download archive files (ZIP or JAR) that contain the WAS Liberty runtime and extract them on your system. This method is simple and does not require any installation tool. However, you need to manually update or uninstall WAS Liberty if needed. You can also use the featureUtility command to install additional features from the Liberty Repository. To use this method, you need to have a supported Java runtime environment (JRE) or Java SDK installed on your system. For more details on how to use this method, see Installing Liberty by using downloaded archives.


Using Developer Tools




If you are developing applications using Eclipse, Visual Studio Code, or IntelliJ IDEA, you can use the developer tools for these IDEs to install WAS Liberty and integrate it with your development environment. These tools enable fast iterative development with dev mode, code completion, configuration diagnostics, and more. You can also use these tools to install additional features from the Liberty Repository. To use these tools, you need to have a supported Java runtime environment (JRE) or Java SDK installed on your system. For more details on how to use these tools, see Develop with Liberty Tools.


How to Verify the Installation




After you install WAS Liberty on your system, you can verify that it is working properly by checking the server status and accessing the default web page.


Checking the Server Status




To check the server status, you can use the server command from the command line. The server command is located in the wlp/bin folder of your installation directory. For example, if you installed WAS Liberty in C:\wlp, you can run the following command:


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C:\ C:\wlp\bin>server status defaultServer


The output of this command will show you whether the server is running or not. If the server is running, you will see a message like this:


Server defaultServer is running.


If the server is not running, you will see a message like this:


Server defaultServer is not running.


You can also use the server start and server stop commands to start and stop the server, respectively.


Accessing the Default Web Page




To access the default web page, you can use a web browser and navigate to the following URL:


http://localhost:9080


This URL will show you a welcome page that contains some information about WAS Liberty and links to documentation and resources. You can also use this page to test your applications by adding the context root of your application to the URL. For example, if your application is called myApp, you can access it using this URL:


http://localhost:9080/myApp


Conclusion




In this article, you learned how to download and install WAS Liberty on your system using different methods. You also learned how to verify that WAS Liberty is working properly by checking the server status and accessing the default web page. WAS Liberty is a lightweight Java runtime that offers many benefits for developing and deploying modern applications. You can use WAS Liberty to build microservices, modern monolithic applications, and anything in between. You can also use WAS Liberty to leverage the latest open standards, such as MicroProfile, Jakarta EE, and Java EE. If you want to learn more about WAS Liberty and how to use it, you can check out the following resources:


  • WebSphere Liberty documentation



  • WebSphere Liberty guides



  • WebSphere Liberty blog



  • WebSphere Liberty forum



FAQs




What are the minimum supported Java levels for WAS Liberty?




The minimum supported Java levels for WAS Liberty depend on the version of WAS Liberty and the features that you use. For example, WAS Liberty 21.0.0.9 supports Java 8, Java 11, and Java 17. However, some features may require a specific Java level or higher. For more details on the minimum supported Java levels for WAS Liberty, see Supported Java SE levels for WebSphere Liberty.


What are the differences between WebSphere Liberty and Open Liberty?




WebSphere Liberty and Open Liberty are both lightweight Java runtimes that are built on the same code base. However, there are some differences between them, such as:


  • WebSphere Liberty is a commercial product that is supported by IBM and requires a license for production use.



  • Open Liberty is an open source project that is free for anyone to use and contribute to.



  • WebSphere Liberty includes some features that are not available in Open Liberty, such as IBM J9 JVM, IBM MQ JMS provider, IBM WebSphere Batch feature, and IBM WebSphere JCA feature.



  • Open Liberty includes some features that are not available in WebSphere Liberty, such as MicroProfile Reactive Messaging feature, MicroProfile Reactive Streams Operators feature, and MicroProfile Context Propagation feature.



How to add features to WAS Liberty?




You can add features to WAS Liberty using different methods, such as:


  • Using Installation Manager to install features from the online or offline repository.



  • Using featureUtility command to install features from the online or offline repository.



  • Using developer tools to install features from the online repository.



  • Using server.xml file to specify features that you want to enable for your server.



How to troubleshoot common issues with WAS Liberty?




If you encounter any issues with WAS Liberty, you can use various tools and techniques to troubleshoot them, such as:


  • Using log files to check for errors and warnings.



  • Using trace files to get more detailed information about events and operations.



  • Using dump files to get information about the state of the JVM and the application.



  • Using diagnostic tools to analyze performance and memory issues.



  • Using problem determination guides to find solutions for common problems.



</ Where to find more information about WAS Liberty?




If you want to find more information about WAS Liberty, you can use various sources, such as:


  • The official WebSphere Liberty website, which contains product overview, features, downloads, and support.



  • The Open Liberty website, which contains the open source project, guides, blog, and community.



  • The WebSphere Liberty Knowledge Center, which contains documentation, tutorials, samples, and reference.



  • The WebSphere Liberty YouTube channel, which contains videos, webinars, demos, and playlists.



I hope you enjoyed this article and learned something new. If you have any questions or feedback, please feel free to leave a comment below. Thank you for reading!





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