Rustam Mehmandarov

A friendly reminder that #Java #HelloWorld looks like this since Java 24: void main() { println("Hello World"); } No, it is not "public static void main..." anymore. 🫶

Note: For Java 25 and onwards, you either statically import it with import static java.lang.IO.*; and use it like in the code above, or add IO.println("Hello World"); (which is a better practice!).

Rustam Mehmandarov reposted

🇳🇴 Hello, Stavanger! 👋🎤 #OracleACE expertise is joining Hello Stavanger 2026 on October 21–22, sharing knowledge and insights with the developer community. Attending? Catch the session and connect with Rustam! 🚀 🔗 social.ora.cl/6015BGviu3 @rustam.no

Rustam Mehmandarov reposted

@theguywiththeduketattoo.com

🇺🇸 #OracleACE expertise is heading to Colorado for dev2next 2026! 🚀🎤 Joining the developer community in Lone Tree on October 14–15? Catch our ACEs on stage, learn from their sessions, and connect with them at the event. 👋 🔗 social.ora.cl/6017BGvg1P @theguywiththeduketattoo.com @rustam.no

Rustam Mehmandarov reposted

Ivar Grimstad

Java and @jakarta.ee is everywhere. With @rustam.no at JFK on our way to @dev2next.bsky.social #JakartaEE #EclipseFoundation #Community

Rustam Mehmandarov reposted

Maarten Mulders 💙💛

@mthmulders.bsky.social

Learning about various types of security measures you can stack in LLM-powered applications from @rustam.no. Just like any other security problem domain: one defense layer isn't enough, you want to stack them.

IntelliJ IDEA, a JetBrains IDE

9 Sept

Happy Birthday, @sharatchander.bsky.social! Keep being amazing and that's for all you do for the #Java community! Enjoy your day! 🎂🥳

Rustam Mehmandarov reposted

dev2next.bsky.social

@dev2next.bsky.social

7 Sept

Ready to move beyond simple AI API calls in your Java apps? ☕🤖 @rustam.no shares 5 advanced strategies for building intelligent, resilient & scalable GenAI applications, with examples using Jakarta EE, LangChain4j & Quarkus at #dev2next. 🔗 www.dev2next.com/speaker/078e...

Rustam Mehmandarov reposted

@intellijidea.com

5 Aug

Too much happened in tech this July to keep up? We did the filtering for you. Catch the best releases, Java and Kotlin news, AI experiments, tutorials, standout ideas, and @thedonraab.bsky.social handpicked picks in Featured Content. Let’s go! 🚀 jb.gg/kn63l0

jb.ggJava Annotated Monthly – August 2026 - The JetBrains BlogJuly gave the tech world plenty to talk about, from fresh releases and useful tutorials to Kotlin updates, AI experiments, and new ideas across the wider ecosystem. We packed the best of it into one i

Rustam Mehmandarov reposted

Donald Raab

@thedonraab.bsky.social

18 July

Read a great blog from @smarks.bsky.social, which reminded me to watch "The Java Story" on my big screen. stuartmarks.wordpress.com/2026/07/17/t.... So good! Well done! 15 years ago I met some the folks in this story for the first time at JVMLS 2011. Proud to be part of the #Java community. 🙏👏

17 July

Excited to be a part of #JakartaOne Livestream 2026 Program Committee again, alongside an incredible group! We're especially looking forward to reviewing sessions covering: #JakartaEE, #CloudNative #Java, #AI, #AppMod and #microservices. CFP & Registration 👉 jakartaone.jakarta.ee/jakartaone-l...

mehmandarov.comResumable file uploads with plain Jakarta EE and TUS protocolPlain uploads break when connections drop. The TUS protocol fixes that with resumable uploads. Here we will implement it with pure Jakarta REST using POST, HEAD, PATCH, and a few headers.

15 July

A plain HTTP upload is all-or-nothing – one drop at 99% and you start from byte zero. 💥 🎉 New post: resumable uploads with the TUS protocol in pure Jakarta REST. Three methods, a few headers, working demo. 🔗 mehmandarov.com/tus-resumabl... #Java #JakartaEE

Rustam Mehmandarov reposted

Ivar Grimstad

@theguywiththeduketattoo.com

12 July

Hashtag Jakarta EE number 341 is out! Read about upcoming talks, new blog post from @rustam.no , @jakartaone.jakarta.ee CFP, and Vidocq entering the @jakarta.ee scene www.agilejava.eu/2026/07/12/h... #JakartaEE #EclipseFoundation #Community

agilejava.euHashtag Jakarta EE #341Welcome to issue number three hundred and forty-first of Hashtag Jakarta EE! Even if July traditionally is a rather slow month regarding conferences, I have a couple coming up next week. On Th…

mehmandarov.comBinary file uploads to REST endpoints using Jakarta EE or QuarkusHow to build a REST API that accepts binary attachments? As part of a multipart payload, or as the whole body. Standard Jakarta REST 3.1 EntityPart, the Quarkus @RestForm approach, and the raw applica...

9 July

🎉 New blog post: Binary file uploads to REST endpoints using #JakartaEE or #Quarkus. How to build a #REST API that accepts binary attachments? #Java mehmandarov.com/rest-api-bin...

Rustam Mehmandarov reposted

7 July

🚀 Meet our #OracleACE speakers at WeAreDevelopers World Congress 2026! Join @rustam.no and @martinelli.ch in Berlin, July 8–10, as they share their expertise alongside one of the world's biggest gatherings of developers and tech leaders. 🔗 www.wearedevelopers.com/world-congress

mehmandarov.comHomeRustam Mehmandarov – senior technologist, architect, speaker, and community builder. Blog, talks, and projects on cloud, architecture, AI, and security.

6 July

I completely rewrote and redesigned my blog and home page. 🎉 What do you think? ➡️ mehmandarov.com What other features would you like to see there? #KnowledgeSharing #Community #Java #GoogleDeveloperExperts

3 July

See you at @dev2next.bsky.social in October? #java #community #LLM #GenAI #security

dev2next.bsky.social@dev2next.bsky.social

The goal isn't perfect LLMs. It's building systems that fail safely when they're wrong 🤖 Join @rustam.no at #dev2next for practical patterns that improve security, reduce risk, and bring predictability to AI-powered applications. 🔗 www.dev2next.com/speaker/078e... #LLM #Security #AI #TechEvents

25 June

Vibe-coding is a fun way to prototype things. I created a PoC in minutes with #AIStudio and #BuildWithGemini. It's a great helper to see what can be done and how. A friendly reminder, just like with PoCs, it's not production ready out of the box. It still has to be reviewed. #GoogleIOConnect

25 June

AI agents and skills everywhere! Helping with all kinds of development. (Human supervision is important though. 🤓) #GoogleIOConnect #BuildWithGemini

mehmandarov.comUnknown JSON fields in Java REST clients: JSON-B, Jackson, Quarkus, and Spring BootWhat happens when a JSON response contains more fields than your DTO declares? The answer depends on your JSON provider. A look at the defaults for JSON-B, Jackson, Quarkus, and Spring when consuming…

22 June

🎉 New blog post! Extra JSON fields in REST responses: ignored or error? It depends. JSON-B, Jackson, #Quarkus, and #SpringBoot do not all behave the same. Inspired by a question at J-Spring in Utrecht. mehmandarov.com/unknown-json... #Java #JakartaEE #MicroProfile

agilejava.euHashtag Jakarta EE #338Welcome to issue number three hundred and thirty-eighth of Hashtag Jakarta EE! We are entering the summer months on the Northern Hemisphere, and with that the activity generally gets a little …

21 June

Thank you for the mention, @theguywiththeduketattoo.com! 🙌 #JakartaEE #Community

Ivar Grimstad@theguywiththeduketattoo.com

Hashtag Jakarta EE number 338 is out! Read about @jakarta.ee 12, #runWithJakartaEE on Strava, and @rustam.no's blog about Jakarta Expression Language www.agilejava.eu/2026/06/21/h... #JakartaEE #EclipseFoundation #Community

19 June

Can we talk more about all of these things? #programming

en.wikipedia.orgGoodhart's law - Wikipedia

19 June

And in general: "When a measure becomes a target, it ceases to be a good measure". en.wikipedia.org/wiki/Goodhar...

mehmandarov.comJakarta EL: safer rules without handwritten predicate parsersA practical look at Jakarta Expression Language as a small in-process policy engine – replacing a handwritten predicate parser with jakarta.el.ELProcessor, then hardening evaluation with a resolver wh...

17 June

🎉New blog post: Before writing your own rules parser, have a look at Jakarta Expression Language (EL). Less parser code, more standard platform. Plus the security work you shouldn't skip: trusted inputs, resolver whitelists, and timeouts. mehmandarov.com/jakarta-el-s... #Java #JakartaEE #Security

𝙳𝚘𝚝𝚊𝚗 𝙷𝚘𝚛𝚘𝚟𝚒𝚝𝚜 ✈️ Codemotion Milan 🇮🇹

12 June

It is fiiiine. Humans don't need to write books anymore, but we will put humans to review the text and pick out the works of Shakespeare (and others). Also, look how fast they are typing!! ⌨🐒

Einar W. Høst@einarwh.bsky.social

The great misunderstanding about the infinite monkey theorem is to think that we’d be able to pick out the works of Shakespeare.

Rustam Mehmandarov reposted

Einar W. Høst

@einarwh.bsky.social

12 June

The great misunderstanding about the infinite monkey theorem is to think that we’d be able to pick out the works of Shakespeare.

Rustam Mehmandarov reposted

Einar W. Høst

@einarwh.bsky.social

4 June

Hard to think of a more poignant expression of the state of affairs in the industry than the Joy of Coding conference taking a break this year.

Rustam Mehmandarov reposted

@horovits.bsky.social

29 May

JCon MakeIT Slovenia speaker selfie with @rustam.no @jensknipper.de @lomagnette.bsky.social #JCon #JConOpenBlend #MakeIT

27 May

What an amazing evening! The pleasure was all mine! Thank you, @hansolo.eu! 😍

This post is unavailable.

mehmandarov.comSane API error handling with RFC 9457 Problem Details in Jakarta EEA practical look at RFC 9457 Problem Details for HTTP APIs in Jakarta EE – a hand-made ProblemDetail + ExceptionMapper approach, the Zalando Problem library, and a short note on Quarkus and Spring.

27 May

🎉 New Blog Post: Sane API error handling with RFC 9457 Problem Details in Java mehmandarov.com/rfc-9457-pro... #jakartaee #java #rfc9457 #api #rest

Rustam Mehmandarov reposted

Ivar Grimstad

@theguywiththeduketattoo.com

16 May

On the way home from a wonderful @geecon.bsky.social with @rustam.no and @jakarta.ee KRK ✈️ CPH #JakartaEE #EclipseFoundation #Community #geecon

15 May

Now it is time for @fmartin.ch to talk about his bug 🐛 collection at @geecon.bsky.social!

14 May

🚨 Breaking news. 🚨 #Java 😂🤣🤣

14 May

Now it is @hansolo.eu's turn to take the stage at @geecon.bsky.social and talk about improving #JVM startup times! #java #community

Rustam Mehmandarov reposted

13 May

🚀 GeeCON Kraków 2026 is just around the corner! 🇵🇱 We’re excited to see Oracle ACEs sharing insights and expertise at one of Europe’s favorite developer conferences! ☕💡 📍 Kraków, Poland | 📅 May 14–15, 2026 🔗 2026.geecon.org @theguywiththeduketattoo.com @rustam.no #OracleACE

3 May

💯!

Donald Raab@thedonraab.bsky.social

Ask questions. Find answers. Verify them. Check again. And again. And then? Then again. Your reputation. Your credibility. Your life. Your family. Not AI's.

agilejava.euHashtag Jakarta EE #330Welcome to issue number three hundred and thirty of Hashtag Jakarta EE! This week, I was at Open Community eXperience (OCX) in Brussels. I will publish a post about it shortly. This year, OCX unfortunately conflicted with JCON Europe in Cologne. This was kind of a bummer for me, but these things happen in the busy conference season. Next year, at least these two conferences won't conflict.

26 Apr

Happy to be mentioned in this edition. #Java #JakartaEE

Ivar Grimstad@theguywiththeduketattoo.com

Hashtag Jakarta EE number 330 is out! With the 2027 dates for Open Community eXperience and JCON, GitHub CoPilot Enterprise at Eclipse Foundation, and an excellent article by Rustam #JakartaEE #EclipseFoundation #Community #OCX

20 Apr

Finally checking #Codemotion Madrid off my wishlist! 🇪🇸✅ Today, I’m taking the stage to talk about API design, architecture patterns, and development with #Java and #JakartaEE. Really excited for this one! #APIdesign #Architecture

Paging @andresalmiray.com: I don't mean to snitch, but @ixchelruiz.bsky.social just said mvn clean install from the stage. Aloud. 🤣🤣🤣

mehmandarov.comAPI versioning in Java using JAX-RS with Jakarta EE and MicroProfileExploring common API versioning strategies in Java using JAX-RS with Jakarta EE and MicroProfile – URL, header, and media type versioning – with pros, cons, and practical code examples.

19 Apr

🎉 New blog post: API versioning in Java using JAX-RS with Jakarta EE and MicroProfile mehmandarov.com/api-versioni... #jakartaee #java #microprofile #api