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WeAreDevelopers LIVE • Sep 14, 2023

Introduction and pitfalls of Java's new concurrency model

David Vlijmincx

Are you accidentally paralyzing your Java 21 applications? Discover why pooling virtual threads is an anti-pattern and how to avoid thread pinning to maximize system throughput.

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#1 about 5 min

Analyzing the traditional Java platform thread model

The legacy Java threading model uses OS-managed platform threads that consume excessive memory and delay processing.

#2 about 4 min

Managing thread resources with executor service pools

Utilizing executor service pools enables thread reuse but can introduce state leaks and structural blocking inefficiencies.

#3 about 2 min

Introducing virtual threads for lightweight concurrency allocation

Virtual threads eliminate core memory allocation limits by utilizing a resizable heap design natively administered within the JVM.

#4 about 3 min

Comparing memory usage between platform and virtual threads

A memory utilization benchmark demonstrates how virtual threads seamlessly scale to support one hundred thousand parallel execution tasks.

#5 about 6 min

Creating and executing virtual threads in Java code

Implementing virtual thread constructors and specialized executor interfaces simplifies massively parallel programming workflows.

#6 about 6 min

Thread mounting and carrier thread execution processes

Carrier threads manage JVM virtual threads via fork-join pools that handle automatic mounting limits during blocking operations.

#7 about 3 min

Recognizing common virtual thread operational pitfalls and limitations

Pooling virtual threads or leveraging them for continuous CPU-bound computations reduces their scaling effectiveness and introduces overarching failures.

#8 about 6 min

Analyzing the risks of unstructured parallel thread behavior

Failing to declare explicit task relationships often creates orphaned threads and wastes execution resources during unexpected errors.

#9 about 7 min

Managing thread lifecycles using structured task scopes

The Java StructuredTaskScope object explicitly controls thread intent through embedded success validation and automated failure shutdown directives.

#10 about 7 min

Building custom structured task scopes for dynamic thread completion

Extending the base scope object enables advanced threshold logic that safely cancels competing threads upon finding designated successful criteria.

#11 about 10 min

Exploring reactive programming implications and virtual thread usage

Common implementation concerns highlight specific ecosystem boundaries around framework migrations, reactive programming displacement, and thread-local modifications.

Matching moments

2:23 min

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Scaling concurrent applications using lightweight virtual threads

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Filip Egeric Filip Egeric · WWC Europe 2026

1:00 min

Introduction to the native Java structured task scope API

Filip Egeric Filip Egeric · WWC Europe 2026

10:03 min

Addressing updates on concurrency extensions and code diagnostics

Mohamed Taman · LIVE

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