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Real-time Java: Links

Real-time Java resources — specifications, real-time JVMs, low-pause garbage collection, low-latency libraries, profiling and streaming.

42 topics•5 categories•Updated October 2026

Real-Time Java Runtimes & Specifications

10 entries

JVMs and standards for predictable timing.

01Real Time Java (Wikiversity)Course material on real-time Java. 02Real-time Java (Wikipedia)Overview of the Real-Time Specification for Java. 03RTSJ websiteHome of the Real-Time Specification for Java. 04JSR 1: Real-time Specification for JavaThe original RTSJ, final. 05JSR 282: RTSJ 1.1Follow-up specification, final. 06JSR 302: Safety Critical JavaSubset based on the RTSJ for certifiable systems; the JCP lists it as active. 07aicas JamaicaVMReal-time Java virtual machine for embedded systems. 08aicasCompany behind JamaicaVM. 09PTC PercReal-time Java platform. 10Eclipse OpenJ9Java virtual machine with low-footprint and alternative garbage-collection policies.

Low-Pause Garbage Collection & Runtimes

9 entries

Tuned collectors give low pauses but not hard guarantees.

11OpenJDKOpen-source Java implementation. 12OpenJDK ZGCScalable low-latency garbage collector. 13JEP 439: Generational ZGCGenerational mode for ZGC. 14Shenandoah GCLow-pause collector in OpenJDK; the wiki may block automated checks. 15HotSpot GC tuning guideOfficial guide to collectors and tuning. 16AzulJava runtimes with low-pause garbage collection. 17Azul PrimeHigh-performance JVM aimed at consistent latency. 18Eclipse AdoptiumFree, supported OpenJDK builds. 19JEP 444: Virtual ThreadsLightweight threads for high-concurrency servers; they do not provide real-time guarantees.

Low-Latency Libraries, Profiling & Measurement

8 entries

Measure and reduce latency in Java applications.

20AeronEfficient reliable UDP and IPC messaging. 21AgronaData structures and utilities for low-latency Java. 22LMAX DisruptorHigh-performance inter-thread messaging library. 23Chronicle QueueLow-latency persisted messaging. 24HdrHistogramHigh dynamic range histogram for latency measurement. 25JMHJava Microbenchmark Harness. 26Java Flight Recorder APILow-overhead event recording and profiling. 27Real-Time Java Profiling (New Relic)New Relic announcement of real-time Java profiling.

Streaming & Communication

10 entries

Real-time work in Java applications.

28Apache KafkaEvent streaming platform with Java clients. 29Kafka Streams (Confluent)Stream processing library for Java. 30Real-Time Data and Big Data Streaming (Confluent)Confluent blog on ksqlDB and streaming. 31Apache FlinkStateful stream processing with Java and Scala APIs. 32Project ReactorReactive Streams library for Java. 33Reactive StreamsStandard for asynchronous stream processing with back pressure. 34Eclipse Vert.xEvent-driven toolkit for reactive applications. 35Real-time communication with WebRTCGoogle codelab on WebRTC. 36WebRTCReal-time audio, video and data in browsers and apps. 37Dev.java: Learn JavaOfficial Java learning hub.

Related Pages

5 entries

Neighbouring directories on this site.

38Real-Time ComputingHub for RTOS, real-time Java, embedded databases and stream analytics. 39Real-Time Systems: An OverviewDeadlines, hard and soft real-time, scheduling and WCET. 40Real-Time Systems & RTOSResources on RTOS and real-time systems. 41JavaJava resources. 42Real-time Data Analytics PlatformsStream processing platforms.

Frequently Asked Questions

What is real-time Java?

Java used in systems with timing guarantees, through the Real-Time Specification for Java (RTSJ) or real-time JVMs with deterministic garbage collection.

How do I choose?

Decide whether you need hard real-time guarantees, which call for a real-time JVM such as JamaicaVM or Perc, or only low pauses and latency, which tuned collectors such as ZGC, Shenandoah or Azul Prime can provide without guarantees.

Which vendors and projects are listed?

Specifications (RTSJ and Safety Critical Java), real-time JVMs, low-pause runtimes, low-latency libraries, profiling tools and streaming resources.

What related pages are there?

Real-Time Systems: An Overview, Real-Time Systems and RTOS, Java, Real-time Data Analytics Platforms and the Real-Time Computing hub.

How current is this list?

Links were checked in October 2026. Vendors that block automated checks are kept and may need a manual click; renamed or acquired products are labelled.