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Learn how to migrate from Oracle JDK to OpenJDK. Explore benefits, key steps, compatibility checks, and best practices for smooth migration.
Oracle Java vs OpenJDK: Everything you need to know before migrating. Explore costs, benefits, challenges, and expert tips for a smooth transition. Read the full guide now!
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Cybersecurity and me
It’s amusing to me that I helped some colleagues get OpenJDK installed. They were trying to do the for all users install and hitting up against the requirement that they don’t have administrator access to install software on their computers. So, I noticed the for me only option and got them to try it. I wonder how many software vendors are going this route because they know their users are…
How to Install OpenJDK 21 on Ubuntu 24.04
This article explains how to install OpenJDK 21 on Ubuntu 24.04. OpenJDK (Open Java Development Kit) is the open-source implementation of the Java Platform, Standard Edition (Java SE). It provides a full suite of development tools, including the Java compiler (javac) and the Java Runtime Environment (JRE), making it easier for developers to create, test, and run Java applications. By installing…
Educatozoid - A Free Platform to Learn and Enjoy at Same Time
Flight Recorder: Examining Java and Kotlin Ap
Flight Recorder: Examining Java and Kotlin Ap
Foreword This article is inspired by the JUG talk I gave about utilising Java Flight Recorder to profile Kotlin applications deployed into the cloud. It’s a very interesting subject that deserves definitely more attention. Introduction The goal of this article is to examine the possibilities of profiling a Kotlin and a similar Java application with JMC/Java Flight Recorder to get a better…
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jmap -heap fails on Ubuntu with OpenJDK
Whenever I try to use `jmap -heap`, which is usually when I’m in a hurry as things are going weird, it fails with:
java.lang.RuntimeException: unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap
Easily fixed by installing the OpenJDK debug symbols.
I’m currently using the openjdk-8 package, so I install the openjdk-8-dbg package. I install without its recommended packages, as it wants to install all kinds of stuff!
apt-get install --no-install-recommends openjdk-8-dbg
Now my jmap -heap works perfectly.
