Most OpenJ9 platforms create debug images as part of the build, automatically on jenkins or when running make all. These are overlays to the JDK which add additional debug information for native debuggers, such as gdb or windbg, to help developers diagnose problems. Looking at a build for the xLinux platform in Jenkins, you can…
OpenJ9 has been using the JPP to produce a custom set of libraries from a single JCL codebase since its inception. The customized libraries are used to build OpenJ9 JDKs. Initially, only the OpenJ9 JCL codebase is structured to support various JPP configurations. Recently the JPP is extended to preprocess some of the JCL code…
Overview A previous blog post described how to deploy unprivileged containers that restore an application that checkpointed itself using OpenJ9 CRIU Support on Kubernetes. This post goes over how to build a simple Spring Boot Application, how to configure the application to use OpenJ9 CRIU Support to checkpoint itself, and how to use Knative Serving…
Introduction In this blog post, we continue to look under the hood of OpenJ9’s CRIU support by examining some ways in which a Java application and the JVM can cooperate to ensure a successful restore with expected behavior. This is a continuation of OpenJ9 CRIU Support: A look under the hood where we started to…
A recent blog post on OpenJ9 CRIU support introduced the motivations and concept of this new feature. In this blog post, we delve deeper into the support built for this feature in the OpenJ9 JVM and JCL (Java Class Library) components. You may be wondering what the difference is between checkpointing a container running a…
