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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.
How To Install Graylog On Ubuntu 20.04
How To Install Graylog On Ubuntu 20.04
In this article, you’ll learn how to install Graylog on Ubuntu 20.04. Graylog is an open-source enterprise-grade log management system, And also it will extract data from the server and aggregates logs. Graylog allows visualizing and search logs on web UI. Steps to Install Graylog On Ubuntu 20.04 Step 1: Update the Ubuntu system to avoid any dependency issues it is always recommended updating the…
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In this tutorial, you will learn how to install OpenJDK 11 on CentOS 7. Oracle JDK includes compiler but compiler for OpenJDK 11 is included in openjdk-devel..
