web service 封装dll问题

我是用的java语言，用的jacob这个中间件(jacob.dll)通过windows 的COM 方式封装的，调用.NET写的一个ABC.dll文件，ABC.dll文件提供的是一个查询功能，可我在tomcat下跑测试的时候，其他都是正常的，但又时候，特别是多线程并发查询的时候，JVM会报错，然后tomcat就挂掉了，请大家来分析下啊，急，分不多，全送上了，错误信息如下：
# An unexpected error has been detected by HotSpot Virtual Machine:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x1000cc7d, pid=1336, tid=2960
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0-b64 mixed mode)
# Problematic frame:
# C  [jacob.dll+0xcc7d]
#
# An error report file with more information is saved as hs_err_pid1336.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp下面是hs_err_pid1336.log里面的信息：---------------  T H R E A D  ---------------Current thread (0x00ac90e8):  JavaThread "Thread-12" [_thread_in_native, id=3680]siginfo: ExceptionCode=0xc0000005, writing address 0x069e1e5cRegisters:
EAX=0x034f0c80, EBX=0x034f0650, ECX=0x034f0f1c, EDX=0x034f0f44
ESP=0x02fefaa8, EBP=0x02fefac8, ESI=0x0000003f, EDI=0x0350200c
EIP=0x1000cdae, EFLAGS=0x00010202Top of Stack: (sp=0x02fefaa8)
0x02fefaa8:   00ac90e8 00000010 02fefb3c ffff7fff
0x02fefab8:   00000020 034f0dc4 034f0f1c 00000000
0x02fefac8:   00000022 1000ae64 034f0650 00ac91a4
0x02fefad8:   1000ae35 00000010 1000a777 00000010
0x02fefae8:   00000001 100090e0 00000010 00ac90e8
0x02fefaf8:   26b488d8 02fefb2c 26b488d8 00ae826f
0x02fefb08:   00ac91a4 02fefb3c 02fefb10 00000000
0x02fefb18:   02fefb3c 26b4a6f8 00000000 26b488d8 Instructions: (pc=0x1000cdae)
0x1000cd9e:   00 00 80 d3 ee 09 37 8b 4d f8 85 c9 74 0b 89 0a
0x1000cdae:   89 4c 11 fc eb 03 8b 4d f8 8b 75 f0 03 d1 8d 4e 
Stack: [0x02fb0000,0x02ff0000),  sp=0x02fefaa8,  free space=254k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [jacob.dll+0xcdae]Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j  com.jacob.com.Variant.init()V+0
j  com.jacob.com.Variant.<init>(Ljava/lang/String;)V+10
j  com.jacob.com.Dispatch.obj2variant(Ljava/lang/Object;)Lcom/jacob/com/Variant;+61
j  com.jacob.com.Dispatch.obj2variant([Ljava/lang/Object;)[Lcom/jacob/com/Variant;+16
j  com.jacob.com.Dispatch.callN(Lcom/jacob/com/Dispatch;Ljava/lang/String;[Ljava/lang/Object;)Lcom/jacob/com/Variant;+4
j  com.jacob.com.Dispatch.call(Lcom/jacob/com/Dispatch;Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Lcom/jacob/com/Variant;+47
j  com.mangocity.util.AVDataset.openAVInfo(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Lcom/jacob/com/Dispatch;)V+19
j  com.mangocity.test.SearchThread.run()V+96
j  java.lang.Thread.run()V+11
v  ~StubRoutines::call_stub---------------  P R O C E S S  ---------------Java Threads: ( => current thread )
  0x003d6d78 JavaThread "DestroyJavaVM" [_thread_blocked, id=2992]
  0x00aced48 JavaThread "Thread-19" [_thread_blocked, id=2112]
  0x00acc228 JavaThread "Thread-18" [_thread_in_native, id=1092]
  0x00acb2c8 JavaThread "Thread-17" [_thread_in_native, id=1704]
  0x00acdbe8 JavaThread "Thread-16" [_thread_blocked, id=3528]
  0x00ac87d0 JavaThread "Thread-15" [_thread_in_native, id=2572]
  0x00ac8c90 JavaThread "Thread-14" [_thread_in_native, id=1596]
  0x00ac9ea0 JavaThread "Thread-13" [_thread_blocked, id=1464]
=>0x00ac90e8 JavaThread "Thread-12" [_thread_in_native, id=3680]
  0x00ac7ca8 JavaThread "Thread-11" [_thread_in_native, id=724]
  0x00ac7110 JavaThread "Thread-10" [_thread_blocked, id=1524]
  0x00ac6578 JavaThread "Thread-9" [_thread_blocked, id=360]
  0x00ac5808 JavaThread "Thread-8" [_thread_blocked, id=1080]
  0x00ac4bc8 JavaThread "Thread-7" [_thread_blocked, id=1568]
  0x00ac3ef0 JavaThread "Thread-6" [_thread_in_native, id=2600]
  0x00ac3218 JavaThread "Thread-5" [_thread_in_native, id=2132]
  0x00aa9478 JavaThread "Thread-4" [_thread_blocked, id=2348]
  0x00aa8800 JavaThread "Thread-3" [_thread_in_native, id=4092]
  0x00ab6030 JavaThread "Thread-2" [_thread_in_native, id=3224]
  0x00ac2288 JavaThread "Thread-1" [_thread_in_vm, id=3820]
  0x00aa96e0 JavaThread "Thread-0" [_thread_blocked, id=3544]
  0x00a927d8 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=3044]
  0x00a6d4d0 JavaThread "CompilerThread0" daemon [_thread_blocked, id=2640]
  0x00a91de0 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=3088]
  0x00a6b148 JavaThread "Finalizer" daemon [_thread_blocked, id=3748]
  0x00a8dc88 JavaThread "Reference Handler" daemon [_thread_blocked, id=3768]Other Threads:
  0x00a49848 VMThread [id=1820]
  0x00a93b58 WatcherThread [id=3192]VM state:not at safepoint (normal execution)VM Mutex/Monitor currently owned by a thread: NoneHeap
 def new generation   total 576K, used 531K [0x22ae0000, 0x22b80000, 0x22fc0000)
  eden space 512K,  91% used [0x22ae0000, 0x22b54fe0, 0x22b60000)
  from space 64K, 100% used [0x22b70000, 0x22b80000, 0x22b80000)
  to   space 64K,   0% used [0x22b60000, 0x22b60000, 0x22b70000)
 tenured generation   total 1408K, used 94K [0x22fc0000, 0x23120000, 0x26ae0000)
   the space 1408K,   6% used [0x22fc0000, 0x22fd7ad0, 0x22fd7c00, 0x23120000)
 compacting perm gen  total 8192K, used 433K [0x26ae0000, 0x272e0000, 0x2aae0000)
   the space 8192K,   5% used [0x26ae0000, 0x26b4c480, 0x26b4c600, 0x272e0000)
    ro space 8192K,  66% used [0x2aae0000, 0x2b037960, 0x2b037a00, 0x2b2e0000)
    rw space 12288K,  46% used [0x2b2e0000, 0x2b8743a8, 0x2b874400, 0x2bee0000)Dynamic libraries:
0x00400000 - 0x0040c000  D:\Java\jdk1.5.0\bin\javaw.exe
0x76eb0000 - 0x76ec3000  C:\WINDOWS\system32\Secur32.dll
0x6d640000 - 0x6d7c5000  D:\Java\jdk1.5.0\jre\bin\client\jvm.dll
0x6d300000 - 0x6d31d000  D:\Java\jdk1.5.0\jre\bin\java.dll
0x6d630000 - 0x6d63f000  D:\Java\jdk1.5.0\jre\bin\zip.dll
0x10000000 - 0x10018000  D:\Java\jdk1.5.0\bin\jacob.dll
0x775f0000 - 0x7767b000  C:\WINDOWS\system32\OLEAUT32.dll
0x774b0000 - 0x775e9000  C:\WINDOWS\system32\ole32.dll
0x77680000 - 0x77703000  C:\WINDOWS\system32\CLBCatQ.DLL
0x76f70000 - 0x770ca000  C:\WINDOWS\system32\COMRes.dll
0x77b60000 - 0x77b68000  C:\WINDOWS\system32\VERSION.dll
0x03620000 - 0x0376a000  C:\WINDOWS\system32\ABE.dll
0x77370000 - 0x77407000  C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_5.82.3790.3959_x-ww_78FCF8D0\comctl32.dll
0x71b10000 - 0x71b1b000  C:\WINDOWS\system32\wsock32.dll
0x71b60000 - 0x71b77000  C:\WINDOWS\system32\WS2_32.dllVM Arguments:
jvm_args: -Xbootclasspath/a:D:\MyEclipse5.5.1GA\myeclipse\eclipse\plugins\com.genuitec.eclipse.j2eedt.core_5.5.1\data\libraryset\EE_5\javaee.jar;D:\MyEclipse5.5.1GA\myeclipse\eclipse\plugins\com.genuitec.eclipse.j2eedt.core_5.5.1\data\libraryset\EE_5\jsf-impl.jar;D:\MyEclipse5.5.1GA\myeclipse\eclipse\plugins\com.genuitec.eclipse.j2eedt.core_5.5.1\data\libraryset\EE_5\jsf-api.jar;D:\MyEclipse5.5.1GA\myeclipse\eclipse\plugins\com.genuitec.eclipse.j2eedt.core_5.5.1\data\libraryset\EE_5\jstl-1.2.jar
java_command: com.mangocity.test.TestTntercurrentEnvironment Variables:
JAVA_HOME=D:\Java\jdk1.5.0
JRE_HOME=D:\Java\jre1.5.0
CLASSPATH=.;JAVA_HOME\lib\dt.jar;JAVA_HOME\lib\tools.jar;"CATALINA_HOME"\common\lib\servlet-api.jar
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;JAVA_HOME\bin
USERNAME=Administrator
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 15 Model 4 Stepping 3, GenuineIntel
---------------  S Y S T E M  ---------------OS: Windows Server 2003 family Build 3790 Service Pack 2CPU:total 2 family 15, cmov, cx8, fxsr, mmx, sse, sse2, htMemory: 4k page, physical 513092k(61316k free), swap 1209756k(535620k free)vm_info: Java HotSpot(TM) Client VM (1.5.0-b64) for windows-x86, built on Sep 15 2004 03:00:31 by "java_re" with MS VC++ 6.0