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IBM Semeru Runtimes
A family of cloud-based runtimes for your Java applications
The IBM Semeru Runtimes are free enterprise-ready OpenJDK-based binaries that can drop-in replace your current Java language runtime. Built with the OpenJDK class libraries and the Eclipse OpenJ9 JVM, IBM Semeru Runtimes deliver high quality, strong security, and top performance to run your Java applications cost-effectively on-prem or in the cloud.
19 December 2025
Article
Achieve high performance Java applications with IBM Semeru Runtimes and Open Liberty
Boost Java application throughput with IBM Semeru Runtimes – learn how the –Xtune:throughput flag, shared classes cache, and native crypto acceleration deliver higher performance while keeping startup, rampup, and memory footprint low.
19 December 2025
Tutorial
Boost Java performance with OpenJ9 JITServer in Kubernetes
Explore how to use OpenJ9 JITServer in Kubernetes to optimize Java performance, improve startup time, reduce container memory usage, and scale cloud-native Java applications on IBM Cloud, OpenShift, and Kubernetes clusters for enterprise workloads.
16 December 2025
Article
Optimize your Java cloud-native applications with OpenJ9 JITServer
In this practical guide and demo, discover how Eclipse OpenJ9 JITServer cuts memory use and cloud costs while keeping Java micro‑container performance high.
11 December 2025
Article
Where do you get your Java?
Looking for the right Java distribution? Learn how IBM Semeru Runtimes compares to other vendors, its performance benefits, and how to choose the best fit for your applications.
21 November 2025
Article
Optimizing Java applications with JFR
Unlock the power of JFR for debugging performance issues in IBM Semeru Runtimes. Dive into thread contention and CPU contention analysis, and leverage JMC's lock instances and processes views for in-depth insights. Follow our step-by-step guide to improve your Java application's efficiency.
15 October 2025
Tutorial
Create your first generative AI Java application with Quarkus and LangChain4j
In this tutorial, learn how to build a Java and Quarkus REST API that uses LangChain4j to call an LLM and generate custom poems on any topic.
09 June 2025
Article
Collecting and transporting a JFR dump from a containerized environment
This article provides the steps to configure and record a JFR dump from a running Semeru application in a containerized environment (specifically an OpenShift environment) and transport it to your local system, with the assumption that you do not have SSH access to the pod that is running the container.
19 June 2024
Article
Explore options for downloading IBM Semeru Runtimes
Learn about IBM Semeru Runtimes, editions available, and where to download.
03 June 2024
Article
Creating cloud-native applications: 12-factor applications
The 12-factor app methodology provides guidelines to help developers design and build cloud-native apps. Explore how to take advantage of each of these factors to create apps, using open source technologies, that thrive in the cloud.
13 December 2023
Article
WebSphere and Open Liberty: Ideal for cloud-native Java applications
Simplify the development and deployment of Java apps with WebSphere Liberty or Open Liberty.
