Java virtual machine internal thread?

Hello,
I just want to know how many the internal thread of java virtual machine.
I know that garbage collector is one thread. But there are always 7 or 8 other threads running even if i run single-threaded java program (only the main class). What thread are they?
Is class loader and execution engine have one thread each? How can they work and synchronize each other?
Thank you.

Just use jConsole (comes with the JDK/SDK) and connect to your running JVM. In the "Threads" tab you see all threads by name and stack traces.
In our server app there are several threads not from our application that run:
ReferenceHandler
Finalizer
SignalDispatcher
Timer-0
DestroyJavaVM
RMI LeaseChecker
RMI TCP Accept-0
RMI TCP Accept-567
RMI TCP Connection...
while all the RMI threads are probably from the jConsole connection.

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    ===== BEGIN DUMP =============================================================
    JRockit dump produced after 6 days, 18:30:14 on Tue Apr 3 09:34:45 2007
    Additional information is available in:
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    to your problem at http://forums.bea.com in
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    Error code: 52
    Error Message: Virtual machine internal error: Bad replacement opcode
    Signal info : si_signo=11, si_code=128
    Version : BEA WebLogic JRockit(TM) 1.4.2_08 JVM R24.5.0-61 ari-49095-20050826-1856-linux-ia32
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    CPU : AMD Pentium 4 (EM64T)
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    81338fd0 :66489d40 00000001 00000000 23a55e44 60c108e8 67a6df68
    81338fe8 :61909a40 67a66f88 40de16d0 67a66f88 23a5543b 67a6df68
    81339000 :67a66f88 61909a40 00000140 00000096 21998594 0000008a
    81339018 :67a6e0e0 67a7bc48 67a6df68 60c108e8 61910978 4e11cc60
    81339030 :67a7bda0 21998526 40da9cf0 66489d40 00000000 67a66f88
    81339048 :236e1b79 60c05860 60c04b08 67a6dff8 60c04b08 60c04b08
    81339060 :23a551a1 65c1c860 23f335b6 6617fcf0 60c05540 65c1c840
    81339078 :6617fcf0 6617be30 40dde998 665a4d78 61909300 40e3c4e8
    81339090 :61909300 21f5cecb 6617fcf0 60c04b08 00000001 6617be30
    813390a8 :6617fcf0 6617be30 21f5cd66 6617fcf0 6617fcf0 550ee590
    813390c0 :21f5cce2 21f5cb2e 550ee590 550ee590 550ee590 21f5a24b
    813390d8 :4aae1a98 550ee590 550ee590 21fa11fe 521fda38 4ab74b08
    813390f0 :4aae8aa0 21bb741c 21bb93f4 21f9e6a8 4ab74b08 6617bdd8
    81339108 :00000000 00000001 40bd1028 4ab74b08 60bfa150 40d976f8
    81339120 :40da6d60 4ab74ad0 4aae8aa0 4aae8aa0 4ab74be0 4ab74b08
    81339138 :4aae8990 4aae8990 4aae8d78 00000000 521fda38 0000006b
    81339150 :8091d9d8 00000002 8091da64 8091d9d8 218a2915 8091da64
    81339168 :8091dad8 8091dad4 08644aa0 8091dad4 00000000 6617e8f0
    81339180 :00000003 4aad2498 00000000 4aad2498 219560a0 4aad2498
    81339198 :21954eda 6617e8f0 00000001 0000010f 05ea8db8 40a114c0
    813391b0 :6617bdd8 6617ccb0 4aad2550 08c43278 4aad2498 21951ac6
    813391c8 :6617bdd8 21951a6e 6617bdd8 4aad2498 21954868 6617bdd8
    813391e0 :00000001 00000000 4aad2498 6617bdd8 6617ccb0 00000000
    813391f8 :43d6fd20 00000000 219541a4 6617bdd8 00000000 24bd3240
    81339210 :00000000 4aad2498 43d6fb50 6617cbc0 00000000 6617bdd8
    81339228 :00000000 6617ccb0 40bcd100 00000000 21953e64 6617bdd8
    81339240 :6617cbc0 00000000 000000d8 4e375188 6617ccb0 6617cbc0
    81339258 :43d6fb50 00000000 6617bdd8 00000000 43d6fb50 21951a6e
    81339270 :6617bdd8 43d6fb50 218f91ee 6617bdd8 6617ccb0 6617bdd8
    81339288 :24b7cbb6 2112d404 43e20630 43e20630 4e37edd0 6617cf28
    813392a0 :6617bdd8 218f894b 6617ccb0 43e20630 00000000 40da6d70
    813392b8 :218f8f84 6617bdd8 43d6fb50 40ae2540 6617cf28 094a7f78
    813392d0 :40da6d70 21f7d0d7 6617bdd8 6617ccb0 6617bdd8 00000002
    813392e8 :40da6b38 4e3805b8 00000000 6617cc08 6617ccb0 6617bdd8
    81339300 :43d6fb50 00000000 6617cf28 00000000 00000000 00000000
    81339318 :43e42000 6617cc08 6617ccb0 21902811 6617bdd8 6617cf18
    81339330 :6617bdd8 00000000 00000000 21901be8 6617bdd8 6617ccb0
    81339348 :6617bdd8 4e3805b8 6617cc08 4e3805b8 6617bdd8 00000000
    81339360 :219017ec 6617bdd8 21f81a39 4e3805b8 6617cc08 6617be60
    81339378 :2288ef68 21f59f12 6617bdd8 40e0f350 40e0f350 6617bdd8
    81339390 :21f595a0 21f56c67 6617c0f0 6617bdd8 40ddd400 6617be60
    813393a8 :6617be30 6617c628 6617c9e8 40e0f458 21f59087 6617c628
    813393c0 :4e0dd188 6617be30 6617c9e8 43ca70e0 43ca70e0 40dcf100
    813393d8 :21f55c8a 4e3805b8 6617bdd8 43ca70e0 6617be30 00000000
    813393f0 :4e3805b8 6617bdd8 43caab08 00000000 43caab08 218f91ee
    81339408 :6617bdd8 4e3805b8 6617bdd8 4e375188 00000017 00000004
    81339420 :24bd90aa 6617bd30 4e3805e0 6617bdd8 218fc766 4e3805b8
    81339438 :00000030 00000000 4e3805c8 218f8f84 6617bdd8 6617bdd8
    81339450 :2113147a 4e3805e0 6617bdd8 4e3805c8 21f54f67 6617bdd8
    81339468 :40ae2300 6617bc18 6617bdd8 4e3805b8 43caa0c8 4e3805e0
    81339480 :4e3805c8 00000000 00000000 218f945b 4e3805c8 4e3805e0
    81339498 :4e3805c8 43e20630 43e20630 4e37edd0 24b7cbb6 43ca94c0
    813394b0 :4e3805e0 4e3805c8 43caa0c8 4e3805b8 40dceec0 00000000
    813394c8 :094a52c8 218f8f84 4e3805c8 4e37e390 00000000 4e3805e0
    813394e0 :43e20630 094a52c8 218f7605 4e3805c8 43caab08 00000000
    813394f8 :00000000 40dceed8 00000000 4e37e390 4e37e390 43caab08
    81339510 :4e3805b8 4e3805c8 4e37f228 8133953c 43e35630 00000000
    81339528 :00000047 8133954c 4e3805e0 2004a344 2002bf74 8133956c
    81339540 :401e8c7f 21147dab 403cc2c8 00000001 81339570 40dcf270
    81339558 :4e37f4d8 43e35518 43e20630 401e8c7f 23f4d9eb 00000111
    81339570 :b7a7909b 403cc2c8 4e3805a0 8133959c 21576968 212f9ebc
    81339588 :200496cc 813395bc 401e8c7f 23f4d9eb 000009eb 00000001
    813395a0 :4e37e390 40dcf270 218f58ec 4e37f4d8 4e3805a0 4e3805a0
    813395b8 :218f57e4 4e37f4d8 40dcf0d8 40dcf270 4e37f4d8 40dceed8
    813395d0 :40a47b80 218f6673 4e37f4d8 40dac2f8 4e37f4d8 00000000
    813395e8 :4e37e390 40a4a8d0 40dceed8 40dceed8 22671204 218f6153
    81339600 :4e37e390 4e37f4d8 40a4a8d0 4e37e390 4e37e390 4e37f4d8
    81339618 :4e37e390 40a4a8d0 218f58ec 4e37f4d8 4e3805a0 4e3805a0
    81339630 :218f57e4 4e37f4d8 40a49b70 40a4a8d0 4e37f4d8 4e3805b8
    81339648 :2168088c 218f5ddf 4e37f4d8 6617bb08 40a47b80 4e37f4d8
    81339660 :4e37e390 43e42000 4e3805b8 40988ed8 4e37f4d8 40988ed8
    81339678 :218f58ec 4e37f4d8 4e3805a0 228657a8 218f5ad0 4e37f4d8
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    813396d8 :218f598e 4e37f4d8 4e37f4d8 4e37e390 4e37e390 4079f208
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    81339720 :4e37f4d8 218f1d01 4e37f4d8 4e372ed8 4e37f4d8 4e37e390
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    81339750 :4e372ed8 43e42000 00000001 4e3739f0 00000001 4e372e38
    81339768 :00004e20 00000063 00000063 43e42000 00000001 3c5a740e
    81339780 :21945474 6617ba10 6617ba40 23f4e679 6617ba40 4e3739f0
    81339798 :6617b8c0 4e3739f0 6617b8c0 43e32c10 4e3739f0 4e3739f0
    813397b0 :6617b8c0 6617b8c0 4e3739f0 6617b8c0 409c1838 4ab5fb50
    813397c8 :4ab5fb50 23b33331 4e3739d0 4e3739d0 6617b8c0 409c1838
    Code:
    23ec7db1 :738bf389 5625e808 c085ffff 738b1874 5619e80c c085ffff
    23ec7dc9 :738b1075 560de810 c085ffff c0310475 01b805eb 5b000000
    23ec7de1 :ccccccc3 cccccccc cccccccc 89cccccc 1c708bf0 1a74f685
    23ec7df9 :8b1c708b 0d8b0046 200e523c 8b14408b ff008844 c0850450
    23ec7e11 :c0310475 01b805eb c3000000 8bcccccc df3e6c35 ccccc322
    23ec7e29 :cccccccc 53cccccc 04ec8355 468bfb89 b490ff00 8b000000
    23ec7e41 :df89185b 8b00568b e27c4c0d 14428b22 0088448b 3d1050ff
    23ec7e59 :ffffffff c031047f 01b805eb 89000000 44058bc5 8920050f
    23ec7e71 :b8002444 20013780 249f42e8 8bf389fd df7aac3d 37e5e822
    23ec7e89 :e889fd25 538bde89 c379e800 568bfd31 7371e800 f78900cc
    23ec7ea1 :0024748b ff00468b 00009090 e8899000 00d194cb f6ebed31
    23ec7eb9 :cccccccc 53cccccc 14ec8355 0c247c89 10247489 1024448b
    23ec7ed1 :b808688b 20089378 249ee2e8 e8f389fd fe0dc8eb 08245c89
    23ec7ee9 :0c24448b 8b18408b df7a743d 24448922 8bde8900 058b004b
    23ec7f01 :2006ff8c 8b14498b ff008144 3d8b3450 22df7a78 7a7c058b
    23ec7f19 :448922df 748b0024 4e8b0824 8c058b00 8b2006ff 448b1449
    23ec7f31 :50ff0081 24748b34 02f1e808 7489ffb9 c8b80824 e8222d7e
    23ec7f49 :fd249e73 44c7f389 00000424 6c890000 7c8b0024 4ce80824
    23ec7f61 :8bffff30 8b0c2444 d7891c50 438bde89 75e9e800 3d8bffff
    23ec7f79 :22df7a1c 00245c89 18e8ee89 8bff818f df7a803d 24748b22
    23ec7f91 :53a9e808 f389fe09 0e74f685 8b00438b f9811c48 239b647c
    23ec7fa9 :448b5075 508b1024 8bd68908 74e80042 8bff7b64 df7a1c3d
    Loaded modules:
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    0x08048000-0x0804ce46 /opt/bea/sp5/jrockit81sp5_142_08/bin/java
    0x4002c000-0x40038a71 /lib/tls/libpthread.so.0
    0x4003c000-0x4005cf6f /lib/tls/libm.so.6
    0x4005e000-0x4005fe23 /lib/libdl.so.2
    0x40061000-0x4019316b /lib/tls/libc.so.6
    0x40000000-0x40014ceb /lib/ld-linux.so.2
    0x4019b000-0x40371eef /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/jrockit/libjvm.so
    0x40017000-0x4002135f /lib/libnss_files.so.2
    0x80615000-0x80624fa5 /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/libverify.so
    0x8062f000-0x8064ea0f /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/libjava.so
    0x80666000-0x806770eb /lib/libnsl.so.1
    0x80ac0000-0x80d90c3c /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/libawt.so
    0x80dcc000-0x80e1e017 /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/libmlib_image.so
    0x80e20000-0x80e265f3 /usr/X11R6/lib/libXp.so.6
    0x80e28000-0x80e748ab /usr/X11R6/lib/libXt.so.6
    0x80e79000-0x80e855e3 /usr/X11R6/lib/libXext.so.6
    0x80661000-0x80664e87 /usr/X11R6/lib/libXtst.so.6
    0x80e87000-0x80f621c3 /usr/X11R6/lib/libX11.so.6
    0x80f66000-0x80f6cefb /usr/X11R6/lib/libSM.so.6
    0x80f6e000-0x80f81223 /usr/X11R6/lib/libICE.so.6
    0x814a5000-0x8155edbc /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/libfontmanager.so
    0x815bd000-0x815d71a3 /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/libdcpr.so
    0x815eb000-0x8163d0ef /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/libcmm.so
    0x81640000-0x8167648f /opt/bea/sp5/jrockit81sp5_142_08/jre/lib/i386/libjpeg.so
    0x81678000-0x8167b133 /lib/libnss_dns.so.2
    0x816bb000-0x816c979f /lib/libresolv.so.2
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    Thread Stack Trace:

    Hi!
    Don't know the reason for your crash, but I recommend you try a more recent version of JRockit as the first step. Download here:
    http://commerce.bea.com/products/weblogicjrockit/jrockit_prod_fam.jsp
    1.4.2_12 R27.1 is a good option. If you wait a week or so, 1.4.2_13 R27.2 will be out which is even better :-)

  • The crash happened outside the java virtual machine in native code

    Hi,
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    # A fatal error has been detected by the Java Runtime Environment:
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    # JRE version: 6.0_20-b02
    # Java VM: Java HotSpot(TM) Client VM (16.3-b01 mixed mode, sharing windows-x86 )
    # Problematic frame:
    # C [zkemsdk.dll+0xfe3b]
    # If you would like to submit a bug report, please visit:
    # http://www.java.net/external?url=http://java.sun.com/webapps/bugreport/crash.jsp
    # The crash happened outside the Java Virtual Machine in native code.
    # See problematic frame for where to report the bug.
    --------------- T H R E A D ---------------
    Current thread (0x003a9000): JavaThread "main" [_thread_in_native, id=3832, stack(0x008c0000,0x00910000)]
    siginfo: ExceptionCode=0xc0000005, reading address 0x00000106
    Registers:
    EAX=0x0090f7c4, EBX=0x00000001, ECX=0x00000000, EDX=0x00000001
    ESP=0x0090f7b4, EBP=0x0090f848, ESI=0x00000096, EDI=0x003a9000
    EIP=0x0351fe3b, EFLAGS=0x00010216
    Top of Stack: (sp=0x0090f7b4)
    0x0090f7b4: 00000000 0090f930 000003fc 00000103
    0x0090f7c4: 0090f800 6d9532d0 373e92a0 00912ec5
    0x0090f7d4: 00000401 0090f7d8 369860d1 0090f800
    0x0090f7e4: 37390050 00000000 37390f90 00000000
    0x0090f7f4: 0090f800 0090f930 003a9000 0090f830
    0x0090f804: 10008fd8 0090f840 0090f930 00000008
    0x0090f814: 0090f88c 0090fa28 0090f8f4 0090f848
    0x0090f824: eb53f637 0351ffdc 00000096 00000003
    Instructions: (pc=0x0351fe3b)
    0x0351fe2b: 0f 53 50 8d 44 24 18 50 e8 58 7c 00 00 83 c4 0c
    0x0351fe3b: 8b 4e 70 51 8b 0e 83 c3 04 53 6a 64 8d 54 24 18
    Stack: [0x008c0000,0x00910000], sp=0x0090f7b4, free space=13d0090f2e8k
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    C [zkemsdk.dll+0xfe3b]
    C [jna5972695927945545932.tmp+0x9182]
    C [jna5972695927945545932.tmp+0x2161]
    C [jna5972695927945545932.tmp+0x2849]
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    j com.sun.jna.Function.invoke([Ljava/lang/Object;Ljava/lang/Class;)Ljava/lang/Object;+90
    j com.sun.jna.Function.invoke(Ljava/lang/Class;[Ljava/lang/Object;Ljava/util/Map;)Ljava/lang/Object;+194
    j com.sun.jna.Library$Handler.invoke(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;+344
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    j com.sun.jna.Function.invoke(Ljava/lang/Class;[Ljava/lang/Object;Ljava/util/Map;)Ljava/lang/Object;+194
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    --------------- P R O C E S S ---------------
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    0x02b10c00 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=1976, stack(0x02dc0000,0x02e10000)]
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