I just com­piled the rxtx v2.2pre3 library (I just call it that way, its the cvs head from 31.6.2010). There are bina­ries for win32, win64 (untested) and Mac OSX in the package:

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# file librxtxSerial.jnilib
librxtxSerial.jnilib: Mach-O uni­ver­sal binary with 3 archi­tec­tures
librxtxSerial.jnilib (for archi­tec­ture x86_64): Mach-O 64-bit dynam­i­cally linked shared library x86_64
librxtxSerial.jnilib (for archi­tec­ture i386):   Mach-O dynam­i­cally linked shared library i386
librxtxSerial.jnilib (for archi­tec­ture ppc7400):    Mach-O dynam­i­cally linked shared library ppc

Down­load rxtx v2.2pre3 here

The max­i­mal ser­ial speed for MacOs X is 230400 (check the file /Developer/SDKs/MacOSX10.6.sdk/usr/include/sys/termios.h) — but I wasn’t able to com­mu­ni­cate with my Arduino at this speed. 115200 baud works fine. Any hints how to fix this?

For your view­ing plea­sure, here is the changelog since v2.1.7 (Jan 29 2006):

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2.2 ???
        Dea­mon Mon­i­tor thread.
        http://mailman.qbang.org/pipermail/rxtx/2009-November/5481981.html
        Ivan Maid­an­ski <ivmai@mail.ru>

        64 bit/ 32 bit fall­back of load­li­brary
        Nathan A. Sweet <nate@n4te.com>

        http://mailman.qbang.org/pipermail/rxtx/2009-November/5482004.html
        regen­er­ated gnu_io_RXTXPort.h and gnu_io_RXTXCommDriver.h;
        changed ver­sion string returned nativeG­etVer­sion();
        moved nativeG­etVer­sion() to RXTXVer­sion;
        added native_psmisc_report_owner() (same as for Win32);
        removed unnec­es­sary Get­LastEr­ror() calls;
        added explicit WCHAR-to-jchar casts (and vice versa) where the
        com­piler com­plains (same for LPWSTR and for “const” qual­i­fier);
        adjusted some debug­ging mes­sages (to also print returned error
        code);
        wrapped remain­ing printed error mes­sages (and Mes­sage­Beep) into
        IF_DEBUG();
        made printj() defined only if DEBUG;
        replaced trail­ing “n” with “rn” in printj();
        replaced “I” type char with “J” one for “eis” field;
        replaced get_java_int_var() with get_java_var_long();
        changed nativeSet­Se­ri­al­Port­Params() returned type to jboolean;
        added native­ClearCom­mIn­put() and read­Ter­mi­natedAr­ray()
        stubs (these should be imple­mented in future);
        removed “Mon­i­torThread­Close­Lock” field usage in event­Loop();
        com­mented out unused throw_java_exception(),
        get_java_boolean_var2() and removed get_java_boolean_var();
        replaced Sleep(0) call with Sleep(1) one in Com­mEvent­Thread() (
        to make yield­ing a bit “more reli­able” among threads with
        dif­fer­ent pri­or­i­ties);
        replaced named event with an unnamed one in
        Ini­tialiseEventIn­foS­truct() (see the note below);
        added new JAVAXCOMM_FRONTEND macro for con­ve­nience (if defined
        then Port­I­nUse­Ex­cep­tion and Unsup­port­ed­Com­m­Op­er­a­tionEx­cep­tion
        are used “javax.comm” pack­age (old behav­ior) else from
        “gnu.io.” one (default));
        com­mented out Dll­Main() def­i­n­i­tion (since it does no action,
        only con­sumes resources);
        updated Readme.
        WinCE com­pi­la­tion fixes an updates
        readAr­ray() sim­pli­fied loop/fix pointer
        Ivan Maid­an­ski <ivmai@mail.ru>
        http://mailman.qbang.org/pipermail/rxtx/2009-November/5411487.html
        http://mailman.qbang.org/pipermail/rxtx/2009-November/5411492.html
        http://mailman.qbang.org/pipermail/rxtx/2009-November/5411490.html
        http://mailman.qbang.org/pipermail/rxtx/2009-November/5411496.html

        Win­dows build improve­ments (MinGW32, MSVC and LCC)
        Ilkka Myller <ilkka@myller.com>
        http://mailman.qbang.org/pipermail/rxtx/2009-September/4822418.html
       
        Imple­mented return value to check­ing to file I/O calls
        Ilkka Myller <ilkka@myller.com>
        http://mailman.qbang.org/pipermail/rxtx/2009-September/4822416.html
       
        Removed unused Math­Works MATLAB tim­ing debug (DEBUG_MW)
        Fixed DEBUG_TIMING
        Ilkka Myller <ilkka@myller.com>
        http://mailman.qbang.org/pipermail/rxtx/2009-September/4822414.html
       
        Fix build on Linux sys­tems with­out UTS_RELEASE (linux/utsrelease.h)
        Ilkka Myller <ilkka@myller.com>
        http://mailman.qbang.org/pipermail/rxtx/2009-September/4816749.html
   
        Apple Xcode 3.x project
        Ilkka Myller <ilkka@myller.com>
        http://mailman.qbang.org/pipermail/rxtx/2009-September/4811084.html
       
        YACK() debug over­flow fix for win­dows
        Stef­fen DETTMER <Steffen.DETTMER@ingenico.com>

        Mul­ti­port fix for Win­dows
        Ilkka Myller <ilkka@myller.com>
        http://mailman.qbang.org/pipermail/rxtx/2009-February/3989441.html

        Fix for SIGSEGV at SerialImp.c Solaris/mac/*bsd
        Ilkka Myller <ilkka@myller.com>
        http://mailman.qbang.org/pipermail/rxtx/2009-February/4810504.html

        Let peo­ple know which port is in use on win­dows.
        Write­File fix for Par­al­lel ports on win­dows.
        Johnny Luong <johnny.luong@trustcommerce.com>

        Solaris sta­tic libgcc link con­fig­ure fix.

        64 bit JNI Fixes  <dan.sandberg.lists@gmail.com>
        Dan Sand­berg
        http://mailman.qbang.org/pipermail/rxtx/2007-June/3676251.html

        Main­tain DTR=false dur­ing set­Se­ri­al­Port­Params  
        Beat Arnet <beat.arnet@gmail.com>
        http://mailman.qbang.org/pipermail/rxtx/2009-January/3682508.html
        http://bugzilla.qbang.org/show_bug.cgi?id=104
       
        Avoid debug sprintf over­flows on win32.
        http://mailman.qbang.org/pipermail/rxtx/2009-January/3682496.html
        Luis Pires <lpdev@ruabrasil.org>

        dis­able dcb.fDtrControl to avoid unex­pected behav­ior.
        Beat Arnet <beat.arnet@gmail.com>
        http://bugzilla.qbang.org/show_bug.cgi?id=104

        thresh­old fix
        Alexan­dre Rusev <cyberflex@mail.ru>
        http://bugzilla.qbang.org/show_bug.cgi?id=85

                RXTX close dead­locks in REXTXPort.finalize
        Joachim Buechse <joachim@buechse.de>
        http://bugzilla.qbang.org/show_bug.cgi?id=53

        Add ACM ser­ial devices to all known ports.
        Dun­can Pierce <duncan.pierce@syntropy.co.uk>
        http://bugzilla.qbang.org/show_bug.cgi?id=51

        Con­cur­rency fixes for SMP/multicore sys­tems
        U. George <netbeans@gatworks.com>
        http://bugzilla.qbang.org/show_bug.cgi?id=100

        Fixes for MAC sys­tems with no dri­vers installed.
        1.5 stop bit fix

        Enable uni­ver­sal library builds for Mac OS X
        Andre-John Mas ajmas@sympatico.ca
        http://mailman.qbang.org/pipermail/rxtx/2007-December/1793319.html

        Do not remove and ignore inter­rupts.
        Joachim Buechse <joachim@buechse.de>
        http://bugzilla.qbang.org/show_bug.cgi?id=45

                find ports which were added after pro­gram startup on Mac OS X.
                Mar­tin Ober­hu­ber <martin.oberhuber@windriver.com>
        http://bugzilla.qbang.org/show_bug.cgi?id=48

        Clean up Comm­Port Own­er­ship code, avoid pos­si­ble dead­locks,
        fix lost comm­port own­er­ship events.
                Mar­tin Ober­hu­ber <martin.oberhuber@windriver.com>
        http://bugzilla.qbang.org/show_bug.cgi?id=83

        rxtx does not com­pile against JDK-1.6
        Nebo­jøa <nebojsa@anja.ig3.net>
        http://bugzilla.qbang.org/show_bug.cgi?id=84

        con­fig­ure script failed at line UTS_RELEASE
        megov <megov@mail.ru>
        http://bugzilla.qbang.org/show_bug.cgi?id=80

        code cleanup patch (extra ‘;’ cre­ates bug for if state­ments
        + new String() calls removed)
        Xavier Le Vourch <xavier@brittanysoftware.com>
        http://bugzilla.qbang.org/show_bug.cgi?id=77

        Wont com­pile on linux ppc with glibc 2.5 — no sys/io.h
        Brian John­son <site-rxtx.org@sherbang.com>
        http://bugzilla.qbang.org/show_bug.cgi?id=72

        rxtx over­writes Sys­tem prop­er­ties
        Andrew Gillett <asgillett@gmail.com>
        Nek­tar­ios K. Papadopou­los <npapadop@inaccessnetworks.com>
        Nebo­jøa <nebojsa@anja.ig3.net>
        http://bugzilla.qbang.org/show_bug.cgi?id=64

        Solaris ACM port sup­port
        Dave Cleal <dc@cleal.com>
        http://bugzilla.qbang.org/show_bug.cgi?id=59

        Set­ting of non-standard baud rate fails.
        Andrew Prunicki <aprunicki@yahoo.com>
        http://bugzilla.qbang.org/show_bug.cgi?id=58

        RXTX uses lock­files on MacOS X (instead of ioctl TIOCEXCL)
        Joachim Buechse <joachim@buechse.de>
        http://bugzilla.qbang.org/show_bug.cgi?id=50

        JavaDoc fixes
        Joachim Buechse <joachim@buechse.de>
        http://bugzilla.qbang.org/show_bug.cgi?id=49

        need to review:

        http://bugzilla.qbang.org/show_bug.cgi?id=53
        http://bugzilla.qbang.org/show_bug.cgi?id=46
        http://bugzilla.qbang.org/show_bug.cgi?id=41

Edit 8.2.2011:

  • librxtx works fine with the bau­drate 921600.
  • Make sure your /System/Library/Java/Extensions/ direc­tory does not con­tain old versions!
  • do not rename old ver­sion, delete them!!!!

Serial library rxtx v2.2pre3

5 Comments

  • 1 Mike wrote:

    your 64-bit works fine but you need to update RXTX Ver­sion in the jar file. Cur­rently a warn­ing is given as follows:

    WARNING: RXTX Ver­sion mis­match
    Jar ver­sion = RXTX-2.2
    native lib Ver­sion = RXTX-2.2pre3

    It would be nice if this is cor­rected. Keep me updated please.

    July 27, 2010 at 06:25 Permalink

  • 2 michu wrote:

    I know — it’s because the native library is not yet final but the java lib is. So no need to fix this.

    July 27, 2010 at 11:26 Permalink

  • 3 Phil wrote:

    For some rea­son when I try to use the 2.2 library my JVM crashes when it goes to ini­tial­ize the RXTX dri­vers. Any Idea what would cause this? This is on Win32 XP.

    I am using 2.1.7 Ok.

    September 8, 2010 at 05:34 Permalink

  • 4 Fabio wrote:

    Hi, I am hav­ing prob­lems with rxtx 2.2pre2 when i have more than two open ser­ial ports at the same time. The sys­tem crashes and closes:

    A fatal error has been detected by the Java Run­time Envi­ron­ment:
    #
    # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000005cbc71cd, pid=2924, tid=3880
    #
    # JRE ver­sion: 6.0_16-b01
    # Java VM: Java HotSpot™ 64-Bit Server VM (14.2-b01 mixed mode windows-amd64 )
    # Prob­lem­atic frame:
    # C [rxtxSerial.dll+0x71cd]

    I tried to update to your 2.2pre3 ver­sion but it didn’t solve the prob­lem. Do you have any idea what could be happening?

    September 14, 2010 at 13:12 Permalink

  • 5 michu wrote:

    Its a bug in the c part of the library– try to send the bug report to the rxtx mail­ing list.

    September 14, 2010 at 15:32 Permalink

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