DubJUG - Java Champion Gerrit Grunwald

Java Champion and Azul developer, Gerrit Grunwald (aka Hansolo) joined us on the evening of Tuesday October 31st at TechMeetup.space in Dublin city centre.

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Welcome to the Jungle - A safari through the JVM landscape

OpenJDK with it’s Java Virtual Machine is great but there is not only one flavour but many. There is Oracle OpenJDK, Eclipse Temurin, IBM Semeru, Amazon Corretto, Azul Zulu, Alibaba Dragonwell, Huawei Bi Sheng, Tencent Kona and many more.

Did you ever ask yourself which one is better, faster, free or something similar?

Or do you want to know where the differences are in those distributions? Well then this session might bring some answers to your questions. It will give you an idea about what the JVM is and will cover all the available distributions not only of OpenJDK but also of GraalVM and will try to explain the differences and features of the available distributions. It will also try to give you an idea what JVM to use for specific use cases.

Drinks and food courtesy of our wonderful partner network

Wargames - Vulnerabilities in Java and why you should care

Java is great and we all spend time on making it more performant, more scalable and maintainable. But should we also be spending some time on making it more secure?

With all that new Java releases and features also come new vulnerabilities and exploits. Because Java is everywhere, it has a huge attack surface which makes it interesting for hackers to search for vulnerabilities in Java and foremost in Java based applications.

Whilst Gerrit professes he's not a Java security specialist, if you, like him, wonder what all these mystique acronyms like NVD, CVE, CVSS, CPU, PSU etc. mean and how they are related to Java security, this session will explain it to you.

Available tools are also shown for you to check whether your Java application is vulnerable to known issues (Oct 2023).

About Gerrit.

Gerrit Grunwald is a software engineer that loves coding for around 40 years already. He is a true believer in open source and has participated in popular projects like JFXtras.org as well as his own projects (TilesFX, Medusa, Enzo, SteelSeries Swing, SteelSeries Canvas, JDKMon).

Gerrit blogs regularly at http://harmonic-code.org, he is an active member of the Java community, where he founded and leads the Java User Group Münster (Germany), he is a JavaOne rockstar and a Java Champion. He is a speaker at conferences and user groups internationally and writes for several magazines.


About the Dublin Java User Group

Since 2006, the Dublin Java User Group, aka DubJUG, has been working with the global Java community to amplify technical knowledge for the benefit of Irish based developers and businesses.

DubJUG Partners

Teckro builds mobile first, Cloud based SaaS Technology solutions, used by the global pharmaceutical companies to change how they conduct clinical Trials.

Using the latest technology including Kotlin, Spring Boot, REST APIs, React, ES6, Swift, MySQL, Apache Kafka, Maven, Gradle, Cassandra, Git, Docker, Kubernetes, Helm, Datadog, AWS, Sonar and much more, Teckro’s makes a real difference globally. Quality of life is improved. In the end, lives will be saved.

Website: www.teckro.com/ / Twitter: @teckroofficial


Stackand.Co have been enriching the professional lives of Java software professionals for over 20 years experience. They have helped many great people elevate their careers, and local companies acquire with the best developers for their teams.

Perhaps they can do the same for you working with companies like this one?

Website: Stackand.Co / Twitter: StackanddotCo


Liberty IT is part of Liberty Mutual Insurance. We’re the cogs behind the #78 Fortune-ranked company, the key drivers behind their global digital enablement journey, reimagining insurance by delivering an ever more efficient service for our customers.

Website: LibertyIT.co.uk / Twitter: @Liberty_IT


Many more technology companies support our community - find out more about them here.