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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T06:18:58+00:00 2026-05-13T06:18:58+00:00

I noticed that Real Time Java 2.2 was released back in September, seems to

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I noticed that Real Time Java 2.2 was released back in September, seems to have come a long way from when I last looked at it. However, does anybody know of any real world uses, commercial or academic to date?

http://java.sun.com/javase/technologies/realtime/index.jsp

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  1. Editorial Team
    Editorial Team
    2026-05-13T06:18:58+00:00Added an answer on May 13, 2026 at 6:18 am

    I offered some publicly-disclosed users of real-time Java in answer to another question; I’ll reproduce here:

    The Real-Time Specification for Java
    now has several commercial-grade
    implementations:

    • Sun/Oracle’s JavaRTS (now unavailable, it appears Oracle has disbanded the JavaRTS team and made the product unavailable, without communicating publicly about it)
    • IBM’s WebSphere
      Real-Time
    • Aonix PERC
    • aicas JamaicaVM
    • Apogee Aphelion

    These products span the continuum from
    compilation to native code (Aonix) to
    J2ME (aicas, apogee), to full J2SE
    (Sun, IBM). Most, if not all, have
    seen deployments in small numbers of
    safety- or mission-critical systems,
    but momentum is building. Examples
    include Eglin
    AFB’s space surveillance radar
    modernization and the US Navy’s
    use of RTSJ in the DDG-1000/Zumwalt
    destroyer. Sun also claims
    deployment in the financial
    transaction processing domain.

    If you are interested in RTSJ, I
    suggest Peter Dibble’s Real-Time Platform Programming, or Professor
    Wellings’ Concurrent
    and Real-Time Programming in Java.

    On a related note, there is also work
    underway to provide a Safety-Critical
    profile for the Java programming
    language, built as a subset of RTSJ.
    Also, an expert group has formed to
    explore a Distributed RTSJ DRTSJ,
    but the work is stalled.

    Not all of the above refers to Sun’s JavaRTS or even RTSJ; several vendors have pursued their own proprietary path for real-time Java because they feel the RTSJ doesn’t match their customers’ needs.

    Some additional users I’m aware of now include Army Future Combat Systems and several of the DARPA Urban Challenge contenders.

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