Inside Java
Inside Java is a podcast for Java Developers brought to you directly from the people that make Java at Oracle. We'll discuss the language, the JVM, OpenJDK, platform security, innovation projects like Loom and Panama, and everything in between.
Episodes
"How JEPs Drive Java's Evolution" with Alex Buckley [AtA]
JDK Enhancement Proposals are OpenJDK's vehicle for documenting and communicating substantial changes of the Java language, its APIs, and the runtime but also the JDK project itself, for example when it comes to development processes. Their well-defined structure and the immense care that goes into writing them make them eminently readable and understanding them well is essential to understanding
"Java *is* Memory Efficient" with Ron Pressler [AtA]
Java's use of memory, often chided for being excessive, is actually a strength as it trades more memory use for fewer CPU cycles. Java can only make this tradeoff due to its moving garbage collectors, something more memory efficient platforms often cannot. But what's the point in leaving available memory on the table if using it makes your program run faster? Efficient use of that resource wouldn'
"Java Gets Post-Quantum TLS" [IJN]
With JDK 27 introducing hybrid key exchange schemes that combine ML-KEM with traditional ECDHE algorithms, Java applications can gain TLS-layer protection against the harvest-now, decrypt-later threat without rewriting business logic. In this episode of the Inside Java Newscast, Ana explains post-quantum hybrid key exchange for TLS 1.3 and demonstrates how a Java application can take advantage of
"Make Java Safer with Flexible Constructor Bodies" [IJN]
Flexible constructor bodies were added to Java 25 with JEP 513. In this episode of the Inside Java Newscast Billy Korando will review the issues with how constructors used to work before Java 25, either forcing developers to write convoluted code, or in some cases undermining the safety and integrity of child classes. Billy will then cover how flexible constructor bodies address these issues and h
"Ask the Architects at JavaOne'26" [AtA]
In JavaOne 2026's closing session, audience members had the opportunity to ask the Java architects questions. They asked about the state of structured concurrency and Project Babylon, how Java is being developed and the role AI plays in that process, the architects' pet projects, and whether they would ever consider breaking backward compatibility, etc. Make sure to check https://inside.java/podc
"You Must Avoid Final Field Mutation" [IJN]
With JDK 26 / JEP 500 starting to prevent final field mutation through reflection, it is important that Java projects stop employing that practice. For more, check https://inside.java/podcast
"How JDK 26 Improves G1's Throughput" [AtA]
G1 is Java's default garbage collector in most environments, and its throughput has been considerably improved in JDK 26 by streamlining its write barriers. This conversation explores the background of that change and dives deep into regions, write barriers, concurrent marking, card tables, and how all that impacts throughput before eventually getting to the improvements made in Java 26, which lay
"Analyzing Crashed JVMs" [IJN]
The Java tool jcmd ("j command") sends diagnostic commands to the JVM, which will react by supplying the desired information: from finalizer queues to heap and thread dumps, from GC insights to virtual thread scheduler statistics. At the moment, this requires a running JVM, but once candidate JEP 528 is adopted, a lot of that information can be seamlessly extracted from a crashed JVM's core dump,
"Java Carrier Classes & Discussing Syntax" [AtA]
Carrier classes are Project Amber's current idea to extend some of records' benefits to regular classes. Probably the most important among them is deconstruction, which would allow classes to participate in pattern matching and reconstruction. In recent weeks, there have been two mails to the Amber mailing list that describe that idea, and in this episode we discuss them both as well as the evolut
"Unboxing Java 26 for Developers" [IJN]
Java 26 is getting all packaged up to be shipped worldwide! As with every release of the JDK there are a number of new features, improvements, changes in behavior, and more developers should be aware of before upgrading. In this episode of the Inside Java Newscast we will review all the noteworthy changes coming in Java 26 that will impact developers.
"Towards Better Checked Exceptions" [IJN]
Java's checked exceptions are both an integral part of the language and one of its most contested features. Whether their introduction was a mistake and whether they should all be turned unchecked are frequently discussed topics but since the former is not overly relevant and the latter unlikely, this conversation isn't moving Java forward. Instead, let's talk about specific issues with checked ex
"LazyConstants in JDK 26" [IJN]
Lazily initializing fields in Java is error-prone and undermines constant-folding. JDK 26 comes with JEP 526, which previews LazyConstant, a type that lazily initializes a value through a given Supplier. It executes that supplier at most once successfully and then assigns the value to a field annotated with @Stable, which allows constant folding. This API is also a poster child for how OpenJDK dev
"HTTP/3 in Java" [ATA]
HTTP/3 is the next version of the internet's most important application layer protocol. But, somewhat surprisingly, it uses UDP (via the new QUIC protocol) instead of TCP/IP, which has implications for the number of initial round trips, HTTP version selection, and time to first byte, but also adoption and evolution. Java 26 supports HTTP/3 out of the box. Nicolai Parlog talks to Daniel Fuchs and D
"Carrier Classes" [IJN]
This episode presents Project Amber lead Brian Goetz's recent email "Data Oriented Programming, Beyond Records", wherein he describes plans to improve Java's data handling capabilities by introducing carrier classes, a generalization of records. Like them, carrier classes describe their state through a component list that defines the type's external API: accessors, a constructor, and matching deco
"Java's Plans for 2026" [IJN]
In 2026, Java keeps evolving: Project Valhalla is gunning for merging its value types preview in the second half of this year; Babylon wants to incubate code reflection; Loom will probably finalize the structured concurrency API; Leyden plans to ship AOT code compilation; and Amber hopes to present JEPs on constant patterns and pattern assignments. And those are just the most progressed features -
The New Inside Java Podcast
Welcome to the new Inside Java Podcast. In this meta episode, Nicolai Parlog introduces you to the podcast's new structure with two shows under one umbrella: The long-form conversations you know become Ask the Architects episodes and they'll be accompanied by the Inside Java Newscast as a podcast.
"Scripting Java, Collections & Generics, BeJUG"
In this special episode of the Inside Java Podcast, Nicolai Parlog talks to Adam Bien about scripting with Java, to Maurice Naftalin about the history and tradeoffs of the collections framework and erasure, and to Tom Cools about the innovative way the Belgian Java User Group organizes itself.
"Predictability or Innovation? Both!" with Georges Saab
This Inside Java Podcast takes a meta approach. Instead of focusing on specific features, it explores the bigger picture: What are the right problems for Java to tackle? What are the current and future challenges for the Java platform? Why is predictability so important for Java, and what's driving the recent focus on learners and students? Nicolai Parlog discusses these topics with Georges Saab,
"From Sumatra to Panama, from Babylon to Valhalla" with John Rose
Java's development embraces the past as well as the future and after contributing to it for over 30 years, John Rose is intimately familiar with the process. In this episode he talks about feature design, the right amount of technical debt (which isn't actually zero), why Rice's theorem demands a mix of static and dynamic checks, how Project Sumatra eventually birthed Panama and Babylon, and more.
"From Cowboy Mode to Careful Stewardship" with Mark Reinhold
Java is a 30-year success story, made possible because its development consistently aligned with users' needs. In its early days, the platform required new features quickly, but over time, minimizing code breakage while carefully evolving the platform became essential. Critical junctures along that path included the introduction of modules and the current strive toward integrity by default. Nicola
"Amber & Valhalla - Incremental Design and Feature Arcs" with Brian Goetz
OpenJDK projects such as Amber and Valhalla are renowned for their careful and methodical approach to designing and introducing new features to the Java platform. In this episode, Nicolai Parlog is joined by Brian Goetz, Java Language Architect at Oracle and lead of both Project Amber and Project Valhalla. Brian shares insights and updates on these influential initiatives as they discuss Amber's u
"Deprecations & Removals" with Stuart Marks
Java is not just adding features, it's also removing old ones that became obsolete and are either a maintenance burden, performance drag, or hazardous to use. In this episode we touch on 32bit ports, applets, finalization, and the security manager. Nicolai Parlog talks to Stuart Marks, who works in the JDK Core Libraries group at Oracle. Right now, he's dressed in a lab coat and wears a stethoscop
"Integrity by Default" with Ron Pressler
The Java runtime offers a host of guarantees like memory safety, type safety, encapsulation, and many more. What makes these aspirations actual guarantees is a property called "integrity". But there are a few mechanisms in Java that allow undermining integrity - some for good, some for less good reasons. Integrity by default states that all such operations need to be disabled by default. Today we
"Efficient Initialization Using Stable Values" with Per Minborg
The Stable Values API is a preview feature in Java 25 that allows developers to define immutable objects that are initialized at most once. It combines the flexibility of lazy initialization with the performance advantages of final fields. In this episode, Ana hosts Per Minborg, a member of the Java Core Library team at Oracle and co-author of JEP 502 on Stable Values. Per explains the concept beh
"Ahead of Time Computation" with Dan Heidinga
OpenJDK's Project Leyden aims to improve the startup and warmup time of Java applications, for now by shifting computation from those phases to the applications' build time. Java 24 ships with ahead-of-time class loading and linking, which is the first step in that direction. In this episode, we learn about that as well as about Leyden's approach to reach its goals and some features that are avail
"Stream Gatherers" with Viktor Klang
In this episode, Ana is joined by Viktor Klang, core JDK architect and author of the Stream Gatherers JDK Enhancement Proposal, to dive into one of the standout features of JDK 24: the Gatherers API. Viktor explains how Gatherers extend the Java Stream API with custom intermediate operations, why they were added to the platform, and how they can enhance your day-to-day Java development. He also sh
"Doc, JavaDoc and Markdown" with Jonathan Gibbons
Java leads by example regarding documentation: JavaDoc inspires trust in developers through its transparency on each Java API functionality, and the javadoc tool helps developers generate equally great documentation for their APIs and libraries. In this episode, Ana hosts Jonathan Gibbons, core contributor and maintainer of JDK tools, to discuss JavaDoc/javadoc developments, focusing on markdown i
"Inside Java Weekly: JDK 24 and More" with Chad
In this shorter-format pod, Chad talks about JDK 24, preview features, and more. Show Notes JEP 11: Incubator Modules https://openjdk.org/jeps/11 JEP 12: Preview Features https://openjdk.org/jeps/12 Using the Preview Features Available in the JDK https://dev.java/learn/new-features/using-preview/ JEP 483: Ahead-of-time Compilation https://openjdk.org/jeps/483 JEP 485: Stream Gatherers https://op
"The Panama Effect" with Jorn Vernee
The Foreign Function and Memory API will be finalised in JDK 22. This API helps you integrate native code within your Java program. Using this new API you can efficiently invoke code outside the JVM, safely access memory not managed by the JVM, call native libraries and process native data without the brittleness and danger of JNI. Jorn Vernee, core contributor and maintainer of the FFM API, is A
"Sequenced Collections" with Stuart Marks
Sequenced Collections, targeted for JDK 21, are a new collection type created to represent a sequence of elements with a defined encounter order. Ana recorded this episode with Stuart Marks, the owner of JEP 431 about Sequenced Collections. Stuart discusses the essence of Sequenced Collection interfaces, what needs those address and how they fit within the existing Collections framework. He explai
"Preview Features: A Look Back and A Look Ahead" with Alex Buckley
Preview Features have been essential to the delivery of Java for the past 5 years, and Java 20 is no exception with second previews of both Virtual Threads and the Foreign Function & Memory API. Chad discussing the importance of Preview Features with Alex Buckley, as well as an Informational JEP that added some further clarification for Preview Features with large surface areas. Some show notes: J
"Helidon Níma & Virtual Threads"
Helidon Níma is the first Java microservices framework built from the ground up on virtual threads. David recorded this episode with Tomas Langer, the Helidon architect. Tomas discusses virtual threads from a framework developer point of view. He explains Níma, its architecture and how virtual threads fit in. He also shares his views on virtual threads and some behind the scenes details and how it
"Java Language - State of the Union"
In this episode, David discusses with Gavin Bierman, the latest evolution in the Java Language. In addition to being a regular guest on this podcast, Gavin spends most of his time on designing new Java language features. They are chatting about Project Amber's latest features related to Pattern Matching but also the String Template feature currently in draft. Through this discussion, you will also
"JavaFX"
During JavaOne, David sat down with Kevin Rushforth (OpenJFX Project Co-Lead, Oracle) to discuss the JavaFX, OpenJFX and the new JavaFX builds that Oracle is now producing.
"Java 19 is Here!"
In this two-part episode, Chad interviews Ron Pressler, architect and lead for Project Loom, on Virtual Threads and Structured Concurrency, followed by Brian Goetz, Chief Language Architect, on Record Patterns and the arc of features in Project Amber leading to data-oriented programming. Show notes: JDK 19 JEP 425 Virtual Threads JEP 429 Structured Concurrency Game of Life by Elliot Barlas Projec
"JavaOne is Back!"
Chad interviews Sharat Chander about both the history of JavaOne, and what to expect with the return of it in October. Show notes: Update blog series on Inside.java Register Now to get Early Pricing
"Towards Generational ZGC"
In this episode, David talks with Erik Österlund about the work he did on the Z Garbage Collector, and the plans to make ZGC a Generational GC. Amongst other things, Erik shares some details on the underlying techniques, and the expected benefits.
"Java 18 is Here!"
In this special episode Chad talks with Naoto Sato on JEP 400, UTF-8 by Default, and Michel Trudeau on JEP 413, Code Snippets in Java API Documentation. To round things out, we also pulled in highlights from podcast episodes 21 and 22 to provide an overview of JEP 408, Simple Web Server, and JEP 421, Deprecate Finalization for Removal. Check out Java 18 today at Dev.java!
"The Simple Web Server"
David remotely sat down with Julia Boes, Senior Member of Technical Staff in Dublin, to discuss the Simple Web Server (SWS). The SWS, introduced in JDK 18, is a minimal web server that serves static files. It comes with a command-line tool and an API. In this episode, Julia explains why another web server might be useful. She explains its goals, its features, who it is for but also what it is not!
"JEP 421 and Finalization Deprecation"
In this episode, David remotely sat down with Brent Christian to discuss Finalization and the effort to gradually deprecate this now outdated, brittle, and complex mechanism from the platform. After covering some of the finalization weaknesses, Brent discusses the alternatives to properly deal with resources, i.e. try with resources and the Cleaner API. He then continues with JEP 421 which will be
"Java 17 is Here!" Part 2
To celebrate the Java 17 release, we have not one but two podcast episodes! In this second part, Chad discusses the evolution of the Java language with Brian Goetz, the Java Language Architect. Chad then concludes this special Java 17 episode with Stuart Marks, aka Dr. Deprecator, on the importance of deprecation!
"Java 17 is Here!" Part 1
To celebrate the launch of Java 17 we have not one but two podcast episodes! In this first part, Chad discusses some exiting license changes with Donald Smith, i.e. the Free Java License. Chad then continues the discussion on Project Panama and the Vector API with Paul Sandoz. Make sure to also listen to the upcoming Part 2 where Chad discusses with Brian Goetz and Dr. Deprecator aka Stuart Marks!
"Java's steady march towards strong encapsulation" with Alan Bateman
With JEP 403, Java 17 will strongly encapsulate the JDK internals. This is the latest step in a process that began in Java 9 with the modularization of the JDK. In this episode, Alan Bateman joins Chad to discuss the importance of strong encapsulation, the history, how this will affect your applications today, and what to do in order to prepare for it.
"Pattern Matching" with Gavin Bierman
In this episode, David discusses with Gavin Bierman a new set of Java language features coming from Project Amber, i.e. Pattern Matching. In addition to `sealed classes` and `pattern matching for instanceof`, they are covering in great detail a new (and great!) JDK 17 preview feature: `pattern matching for switch`.
"Let's discuss JDK and Networking" with Michael McMahon and Daniel Fuchs
In this episode, David (remotely) sat down with Michael McMahon and Daniel Fuchs both from the Java Dublin engineering team to discuss some of the recent JDK network-related updates: from the HTTP/2 Client API (Java 11) and its updates in Java 16 to the new Java 16 Unix Domain Socket Channel API. There's even a small HTTP/3 sneak peek.
"Java 16 is Here!" with Mikael Vidstedt
The release of Java 16 was a good reason to invite Mikael Vidstedt, Director of JVM Engineering, again into the show. In this episode, Chad and Mikael discuss some of the new JDK 16 features, the 6 months release cadence but also how some Valhalla initial bits are starting to gradually appear into the platform, and more! For the detailed show-notes, make sure to check-out the episode page at https
"Records Serialization" with Julia Boes and Chris Hegarty
Records are a standard and permanent Java language feature starting Java 16. This was a good occasion for David to discuss Records, and more specifically Records serialisa… Records serialization with Julia Boes and Chris Hegarty. Julia and Chris are both from the Dublin Java engineering team. They both work on Core Libraries, and as such, they have been deeply involved in the recent serialization
"JDK Flight Recorder" with Markus Grönlund
Chad discusses JDK Flight Recorder (JFR) with Markus Grönlund. Learn all about JFR including how to get started, the problems it addresses, the many event types it outputs, the new streaming capabilities, and more! Links Mentioned JDK11 - Introduction to JDK Flight Recorder https://www.youtube.com/watch?v=7z_R2Aq-Fl8 JEP 328: Flight Recorder https://openjdk.java.net/jeps/328 Continuous Monitoring
"jpackage" with Kevin Rushforth
David Delabassée recently sat down with Kevin Rushforth to discuss the Packaging Tool (JEP 392) more commonly known as jpackage, a new tool that will be made production-ready in JDK 16…
"How to contribute to OpenJDK" with Stuart Marks and Jesper Wilhelmsson
David Delabassée recently sat down with Stuart Marks and Jesper Wilhelmsson to discuss various ways of contributing to OpenJDK. Spoiler alert: there are many!
"Project Panama - The Foreign Linker API" with Maurizio Cimadamore and Jorn Vernee
David Delabassee continues the Panama discussion (cf. Episode 9) with Maurizio Cimadamore and Jorn Vernee. This episode focuses on the Foreign Linker API and the jextract tool.
"Project Panama - The Foreign Memory Access API" with Maurizio Cimadamore and Jorn Vernee
In this episode, David Delabassee discusses Project Panama's Foreign Support with Maurizio Cimadamore and Jorn Vernee. The episode starts with an overview of Project Panama, its Foreign Support and then discusses in detail the Foreign Memory Access API. Panama's Foreign Linker API will be discussed in a follow-up episode.
"Project Loom" with Ron Pressler
Chad Arimura discusses Project Loom with Ron Pressler. Relevant links: https://wiki.openjdk.java.net/display/loom/Main https://inside.java/tag/loom https://github.com/openjdk/loom For all episodes and more, check out Inside Java and follow @java on Twitter. Episodes are now available on YouTube as well.
"The Vector API" with John Rose and Paul Sandoz
In this episode, David Delabassee discusses the new Vector API with John Rose and Paul Sandoz. For more episodes, check out https://inside.java/podcast. Resources: JEP 338: Vector API (Incubator) jdk.incubator.vector Javadoc OpenJDK 16 EA Builds Daniel Lemire's blog
"Project Skara" with Joe Darcy and Erik Duveblad
Chad Arimura discusses Project Skara with Joe Darcy and Erik Duveblad. Relevant Links: https://github.com/openjdk https://github.com/openjdk/jdk https://inside.java/tag/skara https://githubuniverse.com/Project-Skara-migrating-OpenJDK-to-Git-&-GitHub/ For all episodes and more, check out Inside Java and follow @java on Twitter.
"The Z Garbage Collector" with Per Liden
In this episode, David Delabassee (Developer Relations) discusses with Per Liden (ZGC Lead) the Z Garbage Collector that is now production ready in JDK 15.
"Record Classes" with Gavin Bierman
In this episode, David Delabassee (Developer Relations) discusses with Gavin Bierman (Consulting Member of Technical Staff) a new Java Language feature emerging from Project Amber, i.e. Records classes! For more episodes, check out Inside Java and follow @Java on Twitter. Contact us here.
"The State of Java" with Georges Saab
Our guest today is Georges Saab (@gsaab), Vice President of Development of the Java Platform Group. We discuss the State of Java after 25 years, the latest innovations in OpenJDK, and why his name is spelled differently. Our host is Chad Arimura (@chadarimura), VP of Java Developer Relations. For future episodes and more, make sure to check out Inside Java and follow @java on Twitter. Additional
"Java 15 is Here!" with Mikael Vidstedt
David Delabassee (@delabassee) discusses the latest Java release, Java 15, with Mikael Vidstedt (@MikaelVidstedt), Director of JVM Development. For future episodes and more, check out Inside Java and follow @java on Twitter. Covered in This Episode New or updated Java language feature, Java SE API feature and JDK API Sealed Classes (Preview) Hidden Classes Reimplement the Legacy DatagramSocket
"Welcome to Inside Java!" with hosts Chad and David
Welcome to the Inside Java podcast. In Episode #1 (we couldn't start at 0), the hosts Chad Arimura (VP Developer Relations) and David Delabassee (Developer Relations) introduce the Java Platform Group at Oracle, major innovation projects in OpenJDK, the Inside.java aggregation site, and this podcast. Both Chad and David can be found on Twitter: @chadarimura, @delabassee. For future episodes and
